276 results about "Simulated rainfall" patented technology

The invention discloses a testing device and a testing device method for simulating collapse of tunnel surrounding rock under conditions of rainfall and underground water seepage. The testing device comprises a model testing box, a rainfall adjustable simulating system, an underground water seepage simulating system, an underground water supplying system, a water content testing system, a stress monitoring system, a digital radiography noncontact measuring system and an optical fiber bragg grating displacement monitoring system. By simulating a progressive failure process of tunnel weak broken surrounding rock under the action of seepage of surface water and underground water, mechanical behaviors of crushing the surrounding rock under different rainfall conditions and different underground water seepage path conditions are quantitatively researched. By obtaining multiple-physical field information in a tunnel surrounding rock collapse process, multi-information features in different evolutionary phases and internal links of information of all fields of the collapse are analyzed, a progressive failure process and fracture morphology and ranges of the tunnel weak broken surrounding rock under different factors are determined, and the effective basis is provided for disclosing a progressive failure principle and a dynamic pressure arch effect of the weak broken surrounding rock under conditions of rainfall and underground water seepage.

The invention discloses a portable dynamic soil erosion monitor comprising a runoff plot surrounded by an enclosing board on a tested sloping field, a simulation rainfall unit arranged above the runoff plot to simulate rainfall, a water supply unit connected with the simulation rainfall unit to provide water for the simulation rainfall unit, a water-sand measurement device connected with the runoff plot and used for metering water sand flowing out from the runoff plot, a power regulator connected with the simulation rainfall unit and the water supply unit and used for controlling the rainfall capacity and the water supply starting and stopping, and a micro process connected with the water-sand measurement device and used for analyzing water sand data measured by the water-sand measurement device to judge the state of soil erosion. The portable dynamic soil erosion monitor is assembled in segments and is detachable, occupies few area, and is easy to carry; the time spent in building the runoff plot is short, the simulation rainfall unit is convenient to install, the water sand data in the runoff plot can be acquired in real time, the soil erosion modulus are dynamically measured and calculated, the data are accurate, and the portable dynamic soil erosion monitor is wide in application and is suitable for dynamic monitoring of soil erosion amount in different areas as well as data analysis.

The invention discloses an expansive-soil slope hygroscopic deformation model experiment method and a system. The expansive-soil slope hygroscopic deformation model experiment method comprises following steps: A, soil samples are turned and subjected to sun drying so as to control water content and soil filling thickness; B, soil filling is carried out by layers, slope cutting is carried out uniformly, and a part of monitoring components are buried; C, an obtained soil slope is allowed to stand until cracks are generated, and a displacement sensor is arranged; D, physical quantity initial values are recorded; E, a rainfall simulator is used for realizing dropping-pouring type concentrated rainfall, and rainfall amount is controlled; F, physical quantities and rainfall amount are monitored according to rainfall stages; G, a rainfall-evaporation cycle is carried out repeatedly so as to stimulate drying and watering cycle; and H, slope morphologic change is recorded, and results are analyzed. The system comprises a model case, monitoring components, and a rainfall simulator; the monitoring components are arranged in the model case; and the rainfall simulator is arranged on the upper part slope shoulder of the model case. The expansive-soil slope hygroscopic deformation model experiment method and the system are suitable for a plurality of expansive-soil slope hygroscopic deformation model experiments, and possess significant importance for researches on expansive-soil slope stability and catastrophe mechanisms.

The invention discloses an artificially-simulated rainfall device which comprises a water supply bracket and a rainfall bracket, wherein the water supply bracket is provided with a Marten bottle water supply box; a vent pipe is arranged above the Marten bottle water supply box, and the bottom of the Marten bottle water supply box is provided with a pressure sensor; a breathing pipe is also arranged above the Marten bottle water supply box, and the bottom of the breathing pipe is positioned on a raininess-water level calibration line; the pressure sensor is connected with an upper computer outside the Marten bottle water supply box for measuring and recording the raininess in real time through a communication line in the breathing pipe; and both sides of the Marten bottle water supply box are provided with a water inlet pipeline and a water outlet pipeline, wherein the water inlet pipeline is used for supplying water for the Marten bottle water supply box, and the water outlet pipeline is used for supplying the water for a sprinkler which is arranged on a sprinkler bracket through a connecting piece. The artificially-simulated rainfall device can adapt to gradients within a larger range, adjust the rainfall height, adjust the size of a rainfall sub-district and more truly simulate natural rainfall.

The invention discloses a side slope landslide teaching demonstration device and an experiment method. The side slope landslide teaching demonstration device can utilize the prior art to simulate landslide under various working conditions like rainfall infiltration, side slope upper-portion loading, earthquake dynamic load, upper-portion reservoir water storage, and a system comprehensively demonstrates a side slope landslide damaging mechanism; progressive sliding of side slopes different in gradient, compactness and soil quality is demonstrated; grid lines of an observing area on an experiment groove are utilized to record landslide range of the side slopes, calculate size of landslide, analyze difference between an observing result and a calculating result and comparing difference between an experimental and a theoretical result. The side slope landslide teaching demonstration device aims at demonstrating basic phenomena of soil mechanics, revealing mechanical principles in the soil mechanics and comparing practicability of landslide methods like a bishop's slice method and Sweden slice method so as to help teachers to complete teaching tasks to students in class.

The invention relates to a side slope rainfall simulation testing apparatus. The side slope rainfall simulation testing apparatus is composed of a side slope model, a simulated rainfall device, an underground water level simulation system, a heating-chilling integrated air supplying system and a mechanical loading mechanism, wherein the side slope model is arranged in a model box body, the model box body is of rectangular shape with an opening upside, the simulated rainfall device is arranged at the upper part of the model box body and is provided with a plurality of rainfall pipes arranged together, a plurality of nozzles are formed at the bottom of each rainfall pipe and water flows are sprayed out through the nozzles; the underground water level simulation system is composed of the model box body with a porous flexible pipe network, a grid screen and a water drainage pipe network, and is used for simulating the influence of the fluctuation of underground water level on the slide slope model; the mechanical loading mechanism is composed of a stress application plate and a hydraulic jack; and the heating-chilling integrated air supplying system is arranged at the circumferential side of the top part, the bottom part and the periphery of the model box body. The side slope rainfall simulation testing apparatus has simple testing behavior process, can be applied to most of side slope conditions, has low requirements on area size and clearance, and is good in self-stability, moderate in size and convenient for transportation.

The invention belongs to the technical field of researching of an ecological system and provides a method for constructing a comprehensive control system for small-watershed surface source pollution. The method comprises the following steps of: firstly, carrying out remote sensing monitoring on water loss and soil erosion; then carrying out field positioning observation and manually-simulated rainfall; analyzing radial water loss and soil erosion of different land utilization types and an output rate of surface source pollutants including nitrogen, phosphorus and the like through the field positioning observation and the manually-simulated rainfall; calculating a nitrogen and phosphorus source surface pollution load strength and partitioning; carrying out control technology configuration and biological measure benefit monitoring on the surface source pollution which takes the water loss and soil erosion as a carrier; and finally, establishing the comprehensive control system of the small-watershed surface source pollution. The invention provides main measures needing to be adopted and provides evidences for guaranteeing the safety of a main water source land and planning work for supporting water and soil maintenance of a drainage basin, therefore, the method has stronger popularization and application values.

The invention relates to a system for simulating the regional rainfall process, which comprises a hydro-meteorological database, a rainfall process generation subsystem, a rainfall process control subsystem and a rainfall simulation subsystem, and further comprises a regional climate model database, a station information database, a regional climate model, a station information interpolation device, a scale transformation device, a water spray control device, a water supplying device, a spray device, and a sensor mounted on a regional physical model, wherein spray units are arranged crosswise to form a spray unit array. Through the integration of the hydro-meteorological database, the rainfall process generation subsystem, the rainfall process control system and the rainfall simulation units, the generation and the simulation of the past, present and future rainfall processes in the designated area are achieved. The natural rainfall process can be better simulated, and the system has an important scientific research value in the fields of the watershed runoff generation and flow routing process, the research on hydrology and water resources in the lack-data watershed, the inspection and the optimization of the hydrographic station net arrangement, and the intelligence watershed research, and provides a scientific tool for simulation study and application of the regional hydrology.

The invention belongs to the technical field of data processing, and discloses an LSTM neural network cycle hydrological forecasting method based on mutual information, which comprises the following steps: screening and classifying original data through mutual information analysis, and taking rainfall, reservoir water level and flow hydrological characteristics as input characteristics of a long-term and short-term memory cycle forecasting model; the long-term change of flood is reflected by simulating rainfall process training and determining the structure of the LSTMC model; and verifying the output of the model by using the actual flood data. According to the method, the data set is analyzed by adopting a mutual information-based method, the flow at the current moment and each hydrological characteristic of the previous longer time period are fully captured, and the input characteristics of the model are dynamically selected. According to the method, the deep learning algorithm is utilized, the cyclic prediction model based on the LSTM neural network is adopted, when the method is used for flood flow time series prediction, the problem that the hydrological change process is greatly influenced by factors in the earlier stage is solved, and effective features can be automatically captured well.

The invention discloses an experiment device for simulating dam overtopping of a tailing dam under a rainfall action and an experiment method and belongs to the technical field of theories and experiments of the dam overtopping of the tailing dam under the rainfall action. By combining two aspects including a theoretical technology and a testing technology, a dam overtopping mechanism of the tailing dam is jointly disclosed. The experiment device comprises a water circulating and hydrostatic load applying system, a simulated rainfall system, a levelness control system and a simulated reservoir area system; when the simulated reservoir area system is used for simulating rainfall under a real field condition, a dam body attribute replacement body need to be replaced with a real material. By combining a differential hydrostatic pressure theory based on a water-crossing section shape and a similar experiment for simulating real rainfall conditions, the experiment device has the advantages of water saving and environment protection, low cost, convenience and flexibility in dynamic and static load application, flexibility of replacing the dam body attributes, high controllability and the like.

The invention discloses a light aging testing method for a composite core rod, which is characterized in that the method comprises the following steps of: 1) cutting off a test sample; 2) fixing the test sample; 3) increasing the temperature of a box body; 4) conducting a light aging test; 5) conducting a simulated rainfall test; 6) conducting a condensation test; 7) conducting a circulating test; 8) conducting visual inspection; and 9) conducting a tensile strength test. According to the working state and the performance demands of the composite core rod, not only can the alternate change of sunshine and dark environments in a natural environment, the alternate change of high-temperature and low-temperature humid and hot environments, dew condensation at dark nights and the like be designed, but also the test sample is turned round at even speed and the aging behavior of the composite core rod in the natural environment is highly simulated. After the light aging test, the tensile strength of the composite core rod is tested to fully assess the mechanical property change of the test sample before and after the light aging test. Therefore, the light aging testing method for the composite core rod has the advantages of high simulation level, complete performance assessment, high testing reliability and the like.

The invention discloses an indoor artificial rainfall-simulation testing system. The indoor artificial rainfall-simulation testing system is mainly composed of a water supply system, a rainfall simulator, a test chamber and a water sampling device, wherein the water supply system is mainly composed of an artificial rainwater storage water tank, a flow sensor, a submersible pump, an air-operated thin film regulating valve and a water duct; the rainfall simulator is mainly composed of a rainfall support, a micro sprinkler and a universal pipe; the testing chamber is composed of a testing chamber body, a humidity sensor, an air pressure sensor, a temperature sensor and a stainless steel drain pipe; the water sampling device is composed of a stainless steel drain pipe, a funnel-shaped liquid collector and a manual water valve. The indoor artificial rainfall-simulation testing system is used for indoor rainfall simulation, for weather and rainfall characteristics of different areas, through a Chicago rainstorm process curve model and different spray head combining forms, the control and change of rainfall intensity in time and space can be achieved, and the rainfall intensity can be recorded in real time.

The invention provides equipment for determining the spoil loss allowance of developed and constructed projects. The equipment comprises a flow collecting device, a coaming, a rain gauge, a rainfall supporting tube, a rainfall spray nozzle, a pressure regulation controller, a water duct and a water supply device, wherein the flow collecting device is connected with the water outlet of the coaming, and the pressure regulation controller is arranged on the water duct. The method for determining thee spoil loss allowance of developed and constructed projects comprises the following steps: the coaming is filled with spoil of developed and constructed region to form a runoff plot, and the rainfall spray nozzle stimulates rainfall to brush the spoil in the coaming; and the slope runoff is generated along with the prolonging of the rainfall time, and runoff flows in the flow collecting device through the water outlet of the coaming and is collected by the flow collecting device for analysis. The method and equipment have the advantages of realizing monitoring on soil loss amount in certain water collection regions, being incapable of being influenced by the outside factor, carrying out full-process monitoring on soil loss before the project construction, in construction preparation period, during construction disturbance period and the like, and being accurate and trustable for monitored results.

The invention provides a method for measuring field rainfall erodibility. The method comprises the following steps of: selecting an experiment area; setting a micro area; simulating a rain-dropping machine to perform wet rainfall and erosion ratio measurement; calculating the erosion ratio; and then calculating the soil rainfall erodibility. In the invention, by setting the micro area and combining the earth surface treatment, manually simulated rainfall and the like, the runoff in the micro area can be quickly and effectively collected, and the erosion ratio and rainfall erodibility can be calculated; the method can be widely applied to the rapid measurement of different outdoor soil rainfall erodibilities; and moreover, the whole steps and method are simple, the equipment cost is relatively low, and the measurement is quick.

The invention relates to an experiment device and an experiment method for overtopping failure simulation for a tailing dam, which belong to the field of mine geotechnical engineering. The experiment device disclosed by the invention comprises a simulated experiment container, a simulated rainfall device and a gradient change device, wherein the simulated rainfall device is installed above the simulated experiment container. The experiment device disclosed by the invention is capable of simulating the overtopping failure conditions for the tailing dam under different rainfall intensities and different tailing dam slope angles.

A portable artificial rainfall simulation device is composed of a water power device, a rainfall shower, a bracket, a quadrat device and a soil water monitoring device. The rainfall shower is fixed on the top of the bracket and is placed right over the quadrat device; the rainfall shower is connected to a pressure meter, a flowmeter, an artificial pressure pump and a bucket in the water power device through a water pipe of the water power device; a quadrat frame in the quadrat device is embedded into a soil quadrat; the quadrat frame has three closed faces, and one opening face in seamless integration with a collecting groove in the device; a rain cover completely covers the collecting groove; a counting cup is below a water outlet end of the collecting groove; a soil water sensor in the soil water monitoring device is connected with an HOBO collector in the device through a network port type socket; and the HOBO collector and a notebook computer are connected through an HOBO data line. The portable artificial rainfall simulation device has scientific design and simple structure, and enhances adaptability of the device in field, thus providing technical guarantee for conducting a large number of experiments and acquiring experimental data in the field.

The invention relates to a slope instability physical model test device under joint action of rainfall and traffic vibration. The device comprises a model test box with openings in the top and one side, an artificial rainfall simulation unit for providing rainfall, a kinematic simulation unit for outputting a traffic vibration load, a monitoring unit for tracking a slope instability process, and acontrol unit, wherein the artificial rainfall simulation unit is located above the model test box; the kinematic simulation unit is located at the bottom of the model text box; the artificial rainfall simulation unit, the kinematic simulation unit and the monitoring unit are all electrically connected with the control unit. The device can simulate a slope instability evolution rule under single action, mutual action and coupled action of the rainfall and the traffic vibration, and also can carry out a synchronous comparison test on slope instability evolution through multiple combinations. The slope instability physical model test device has the beneficial effects of simple structure, simplicity and convenience in operation and multifunctionality, and provides a certain guidance effect for pre-warning of landslide hazards and prevention and treatment of projects.

The invention discloses simulated rainfall pattern macro-porous pavement water drainage capacity testing equipment and a testing method. The simulated rainfall pattern macro-porous pavement water drainage capacity testing equipment comprises simulated rainfall system equipment, a test bed, a test bed supporting frame, a test piece clamp, a scale plate for measuring the rainfall height, and a drained water collecting device. The problems of actual water drainage capacity test of macro-porous water drainage asphalt pavements can be solved by quantitatively simulating different rainfall patterns, pavement cross slopes, the rainfall height and the vertical and lateral flow of water on the asphalt pavements. By adopting the testing equipment disclosed by the invention, the defects that no tilt angles can be provided, the time of test processes is limited, different rainfall patterns cannot be simulated, and the rainfall flow velocity and rainfall pressure intensity cannot be controlled when water permeability coefficients of an asphalt mixture test piece are tested by using existing testing regulations can be overcome, and the real lateral water drainage capacity and vertical water drainage capacity of the macro-porous water drainage asphalt pavements under different rainfall patterns can be fully and effectively simulated.

The invention is an ice-coated test system for a transmission line system, which is characterized by comprising a spraying system, a refrigerating system, a model system, a measuring system and a defrosting system, wherein the spraying system and the defrosting system are arranged above the model system; the measuring system and the model system are arranged in parallel; the refrigerating system is arranged at both sides of the defrosting system, and the space of the refrigerating system is communicated with the space of the defrosting system; by lowering the air temperature in the test space by the refrigerating system, the spraying system performs simulated rainfall, ice coating is generated by condensed spray on the model system under the joint action of the simulated rainfall of the spraying system and the lower-temperature air of the refrigerating system, the measuring system measures the ice coating diameter, traces and acquires the complete test data, the defrosting system performs defrosting on the ice coating and melts the ice coating so as to finish the test, thus having the capability of simulating the forming process of the ice coating, realizing accurate measuring and enabling the ice coating to be defrosted quickly. The invention provides a technical support for basically solving the ice coating in the transmission line.

The invention discloses comprehensive test equipment for observing permeation and settlement of accumulated gravel soil. The test equipment comprises a permeation and settlement integrated generation observation system and a constant pressure circulating water supply system. The equipment disclosed by the invention has the following technical effects that 1, artificial rainfall is simulated, and the moisture infiltration condition of unsaturated gravel soil under different rainfall intensities is directly observed; 2, the settlement deformation of the soil body in a natural state and under the simulated rainfall condition can be measured; 3, because the equipment is large in overall size, the grading features of the natural soil can be remained to the greatest degree, and a size effect is weakened; and 4, the equipment is accurate in testing, easy to operate and economical in construction cost, the overall structure is subjected to modular combination, and function extension is conveniently realized.

The invention relates to a needle-type simulated rain device and a method for simulating rainfall thereof. The simulated rain device includes a rain device and a water supply device, wherein the rain device includes a frame, a transmission device and a rain collection box; the frame has two vertically connected frames; the transmission The device includes two identical sub-transmission systems fixed on the two frames; the rain collection box is a sealed cuboid, and two adjacent sides are connected to the two sub-transmission devices. The upper end of the rain collection box is equipped with a reactor, and the lower The end face is connected with a plurality of raindrop generators. The water supply unit includes a peristaltic pump. The present invention can fine-tune the size of raindrops, conveniently control the range of rain intensity and rainfall height, and is convenient to install and adjust the needle-type rainfall device indoors and outdoors, and is used for studying rainfall characteristic parameters such as raindrop diameter, rain intensity, raindrop terminal velocity, and raindrop kinetic energy.

The invention provides a simulated rainfall earth pillar infiltration test system which is used for researching infiltration laws of rainfall in unsaturated soil. The simulated rainfall earth pillar infiltration test system is characterized in that the test system comprises a simulated rainfall device, a rainwater receiving device, a data acquisition device, a control system and a data analysis device, the simulated rainfall device comprises a water storage tank, a water flow circuit unit and a spray component, the water flow circuit unit is connected with the water storage tank, the spray component for simulating rainfall is connected with the water flow circuit unit, the rainwater receiving device comprises a plurality of soil column cylinder units and runoff drainage units, the soil column cylinder units are arranged on the lower portion of the spray component, the runoff drainage units are arranged on the outer sides of the soil column cylinder units, the data acquisition device comprises a water supply flow meter, drainage flow meters and a plurality of sensor units, the water supply flow meter is arranged on the water flow circuit unit, the drainage flow meters are arranged on the runoff drainage units, the sensor units are arranged on the soil column cylinder units and used for acquiring rainfall earth pillar infiltration data, the control system is used for controlling water supply quantity of the water flow circuit unit and drainage of the runoff drainage units, and the data analysis device is used for receiving data acquired by the data acquisition device and analyzing the data to obtain the infiltration laws of rainfall in the unsaturated soil.

The invention relates to an experimental device for monitoring the whole process of an instability disaster of a discrete fill dam, and belongs to the technical field of geotechnical engineering. Thedevice comprises a water supply device, a rainfall simulation device, a support device and a dam body damage and dam break debris flow motion experiment device. The water supply device provides required water for experiments, the rainfall simulation device is used for simulating rainfall working conditions, the support device is used for supporting the rainfall simulation device and mounting ultrasonic equipment, and the dam body damage and dam break debris flow movement experiment device is mainly used for completing dam body damage and dam break debris flow (flood) movement process research.According to the invention, the evolution process from dam body damage to dam break debris flow (flood) of a tailing dam or a homogeneous earth dam in a downstream river channel can be simulated andresearched under the conditions of rainfall, flood overtopping and piping, parameters such as dam body damage degree, dam body pore water pressure, dam body deformation, dam break debris flow (flood)impact force, flow speed and submerging height are recorded through automatic monitoring equipment, and research on dam body damage and disaster-causing processes is achieved.

The invention discloses a manual simulation rainfall device and method capable of generating various complex rainfall patterns, and belongs to the technical field of urban drainage. The manual simulation rainfall device comprises a water supply system, a discharge measurement switching system, and adjustable lifting bracket system, a shower nozzle system and a discharge program control system capable of generating complex rainfall patterns including Chicago rainfall patterns and the like, wherein the water supply system is connected with the shower nozzle system through the discharge measurement switching system; through the combined action of the discharge program control system and the discharge measurement switching system, the water supply discharge of the water supply system is controlled. According to the manual simulation rainfall device, the rainfall processes of the complex rainfall patterns including Chicago rainfall patterns and the like can be simulated, so that the manual simulation rainfall device has the advantages of high rainfall intensity control accuracy, wide adjustment range, simple equipment and convenience in installation and use, and the requirements of development facility performance rainfall experiment research with low influence in sponge cities and rainfall surface runoff process relative experiments in the technical field of urban drainage are met.

The invention relates to a large-angle side slope simulated scouring test water tank variable in gradient and belongs to the field of model experiments. The large-angle side slope simulated scouring test water tank is mainly composed of a movable type pedestal, a jack group, a scouring tank, an overflow tank, a flow guiding plate, a water supply module, a simulated rainfall module and a recyclingtank. The invention provides a scouring water tank variable in gradient for an indoor side slope model experiment and combines the simulated rainfall module, thus rainfall and runoff scouring side slope model experiments can be simulated on one platform at the same time or at different times; besides, an open type water tank design is adopted, and the actual scouring length can be adjusted according to requirements, so as to adapt to different experimental requirements.

The invention discloses a drainage basin hydrological simulation method based on a 3D print technology. According to DEM terrain information, a three dimensional terrain solid model of a drainage basin to be simulated is obtained by the adoption of a 3D printer, and then hydrological simulation of the drainage basin to be simulated is achieved through the mode of simulated rainfall. The drainage basin hydrological simulation method can be widely applied to the hydrological simulation and the forecast of the drainage basin, and can also be used for collecting drainage basin hydrological data as a data foundation for hydrological model researches. The drainage basin hydrological simulation method carries out the hydrological simulation and the forecast on the basis of the three dimensional terrain solid model of the drainage basin to be simulated and can improve the accuracy of the hydrological simulation and the forecast of the drainage basin without model parameter calibration.

The invention relates to a soil wind-erosion testing system and an evaluation method thereof. The testing system comprises a desk type electronic scale, a wind erosion device, an illumination device and a simulated rainfall device. The wind erosion device consists of a soil sample plate, a support, a support pedestal, a fan, a wind erosion object recoverer, and a moveable windshield. The illumination device includes a lamp tube, a temperature sensor, and a temperature controller. And the simulated rainfall device includes a rainfall sprayer, a water pipe, a rainfall controller, and a water pump. The evaluation method includes the following steps of testing system assembling, testing soil sample placing, first-time testing experiment making, influencing condition implementation, wind erosion performance evaluation, and testing system cleaning. According to the invention, precision of soil wind-erosion performance testing is high; assembling is convenient and operation is simple and reliable; and the anti-wind erosion performance of the soil can be evaluated rapidly and effectively.

The invention relates to an intelligent outdoor artificial rainfall simulation device which comprises a control end, a water conveying system, a rain dropping machine and a group of rain gauges arranged within a rain dropping range of the rain dropping machine, wherein the control end is used for setting rainfall experiment parameters, sending a control instruction to the rain dropping machine and the water conveying system, and acquiring data of the rain gauges; the water conveying system comprises a water tank, a water pump and a water conveying pipe; one end of the water conveying pipe is connected with the water pump, and the other end of the water conveying pipe is connected with the rain dropping machine; the rain dropping machine comprises a pipe rack; the pipe rack is a cubic framework consisting of two steel pipe vertical columns and surrounding steel pipe transverse columns; rain dropping sprayers are mounted at the four corners of the upper end of the cubic framework; first signal receiving ends are mounted on the rain dropping sprayers; and the rain gauges are used for transmitting the acquired rainfall data to the control end. The intelligent outdoor artificial rainfall simulation device has the advantage of convenience in assembling and disassembling; furthermore, a rainfall experiment is simpler, and the experiment cost is reduced; meanwhile, experiment data can be continuously measured, recorded and processed in real time, and the accuracy and the effectiveness of the rainfall experiment are guaranteed.

The present invention discloses an apparatus and a method for testing the permeability degradation law of a sponge city permeable pavement. An upper sleeve is connected with the upper part of a lowersleeve; a rubber sleeve is arranged in the upper sleeve; a to-be-tested permeable pavement test piece is arranged in the rubber sleeve; a first test port is arranged on the sidewall of the upper sleeve, and a second test port is arranged on the sidewall of the lower sleeve; the first test port and the second test port are communicated with a pressure measuring tube; a sloping plate is arranged inthe lower sleeve; a water outlet is opened on the sidewall of the lower sleeve; the second test port is arranged above the sloping plate; the water outlet is arranged at the lowest end of the slopingplate; one end of a water outlet pipe is communicated with the water outlet, and the other end of the water outlet pipe is arranged above a filter screen; the filter screen is fixed at a top opening position of a water collection tank; and a simulated rainfall system is connected with the inlet of a nozzle through a flow meter. According to the apparatus and method provided by the present invention, permeability deterioration of permeable materials under different plugging materials and different rainfall conditions can be tested.