43 results about "Wetting front" patented technology

A method and apparatus for collection of pore water samples from a subsurface geologic formation, especially a vadose zone formation having high capillary tension. The method consists of injection of a fluid with known tracer concentrations therein into the formation. The injected displacement fluid develops a wetting front which carries with it the ambient pore water. The mixture of pore water and tracer-bearing displacement fluid is absorbed by a collection system, such as an absorbent member or pumping system. The injection and collection system are attached to a sealing borehole liner for emplacement in a borehole in the formation, and for other functions. Water samples collected in the collector system may be recovered by inversion of the liner, or alternatively by pumping. Samples thus removed from the borehole may be evaluated for chemicals, such as contaminants. The use of the tracer permits pore water characteristics to be distinguished from the motivating displacement fluid. Apparatuses for performing the foregoing functions are described.

The invention discloses a three-dimensional seepage field observation test device for unsaturated soil with high temporal and spatial resolution, including a seepage test model system, a PIV test system and a pore pressure sensor measurement system. Compared with the prior art, the test device disclosed in the present invention The device can truly reproduce the rainfall infiltration process in the natural state of the soil through the seepage test model system, and can quickly and continuously measure the amount of fluid entering and leaving the soil and the change of the soil pore pressure through the electronic balance, CCD high-speed camera and micro pore pressure sensor At the same time, according to different saturation soils have different color grayscales, the tracking of the wetting front trajectory of the seepage field can be realized, and the three-dimensional seepage of unsaturated soil with high temporal and spatial resolution can be realized by continuous and multi-side photography of the CCD high-speed camera field observation. The model test device of the invention is easy to operate, and the related instruments are simple in structure, strong in adjustability, easy to master, and have great significance for solving geotechnical engineering problems involving unsaturated soil seepage.

The invention provides a measuring device of hydraulic characteristic parameters of unsaturated soil in a moisture absorption / desorption path, which comprises a pedestal, a sample container, a semi-permeable membrane, a silk screen, a weighing device, an accommodating bottle, a water inlet pipe, and a water outlet pipe; the sample container is provided with a chamber for accommodating a soil sample to be measured; a cover plate is disposed at the top of the sample container; the chamber of the sample container is tightly fastened with the pedestal; the silk screen is disposed on the pedestal; the semi-permeable membrane is layed on the silk screen; a soil water potential measuring instrument is disposed on the pedestal; a peristaltic pump is disposed at the water inlet pipe; the water inlet pipe and the water outlet pipe pass through the pedestal; one end of each of the water inlet pipe and the water outlet pipe is communicated with the chamber, and the other end of each of the water inlet pipe and the water outlet pipe is communicated with the accommodating bottle; the water inlet pipe is also provided with the peristaltic pump. The device of the invention controls the suction and the moisture absorption / desorption path of the soil sample by dialysis technology, prevents the influence of wetting front, shortens the measuring time, and can measure hydraulic characteristic parameters of unsaturated soil in the moisture absorption path. The invention also provides a measuring method of hydraulic characteristic parameters of unsaturated soil.

The invention discloses a detecting device for the infiltration performance of an earth pillar. The detecting device comprises a base, a horizontal rotation adjusting mechanism, an earth pillar inlet-outlet adjusting mechanism and a height adjusting mechanism, wherein the horizontal rotation adjusting mechanism is arranged on the base; the earth pillar inlet-outlet adjusting mechanism is arranged on the horizontal rotation adjusting mechanism; the height adjusting mechanism is arranged on the earth pillar inlet-outlet adjusting mechanism. According to the invention, the device can directly detect the migration of the wetting front during the earth pillar infiltration process, and can quickly detect multiple indexes ( temperature, electric conductivity, pH and the like) during the earth pillar infiltration process, is simple in structure, can realize the detection on related indexes during the indoor earth pillar infiltration process, and can also realize the detection on related indexes during the outdoor undisturbed soil infiltration process, thereby being suitable for relevant colleges and universities as well as scientific research institutions to carry out quick detection of relevant parameters during the earth pillar infiltration process.

The invention discloses a system used for measuring soil infiltration performance and includes a constant flow water supplying device, a point source inflow device, a soil storage device and a timing device. The constant flow water supplying device is connected with a point source inflow device, and is used for supplying water to the point source inflow device with a constant flow and monitoring the output stream; the point source inflow device is arranged on the surface of the soil stored by a soil storage device and is used for leading the water flow provided by the constant flow water supplying device to enter the soil with a point source inflow mode; the soil storage device is used for storing the soil and monitoring a wetting front of the soil; the timing device is used for recordingthe time corresponding to the quantity of the water provided by the constant flow water supplying device and the wetting front of the soil and acquiring the soil infiltration rate of the corresponding time according to the stream flow and the wetting radius of the soil of the corresponding time, thus meeting the condition of sufficient water supplying during the test process, ensuring the undisturbed performance of the soil, being capable of measuring the soil infiltration performance simply and accurately.

The invention relates to the technical field of soil infiltration performance measurement, in particular to an undisturbed soil fetcher and a method for measuring soil infiltration performance. The first end of the soil-absorbing pipe is provided with a cutting edge, and the first soil-absorbing pipe positioning ring is arranged in the soil-absorbing pipe protection sleeve; The soil-taking pipe is positioned on the annulus; the soil-taking pipe is used to be placed in the protective casing of the soil-taking pipe; the soil-taking pipe is made of transparent material; the side of the soil-taking pipe is provided with a water inlet, which is used to connect with the water inlet pipe of the water supply device, and the water inlet With seals. The undisturbed soil fetcher of the present invention can not only accurately collect the undisturbed soil in the field, but also can directly use the undisturbed soil in the measurement of undisturbed soil infiltration characteristics, observation of wetting front, measurement of preferential infiltration and observation of preferential flow channels.

The invention relates to a soil infiltration process measuring instrument, in particular to an improved double-ring infiltration process visual test device. The device comprises an inner arc plate and an outer arc plate, a horizontal fixed plate and a vertical fixed plate which are respectively connected with the inner arc plate and the outer arc plate, a vertical connecting plate, and a transparent perforated organic glass plate. In order to observe an advancing process of a wetting front in an infiltration process of a double-ring infiltration test, the device solves the problems that a vertical moisture content distribution test has defects and the influence of preferential flow on the infiltration test is not considered. The improved double-ring infiltration process visual test device is simple in structure and low in manufacturing cost; a double-ring infiltration device is combined with the organic glass plate, so that the change of the wetting front can be observed, and the change of moisture contents of different positions can be measured.

The invention discloses a device for horizontally rotating and extruding the middle flow of collected soil, which comprises a sleeve and a driving rod. The driving rod is located in the sleeve. There are multiple radial holes at different positions, and a telescopic moving part is arranged in each radial hole. One side of the telescopic moving part extends into the sleeve and is provided with two first guide surfaces. The other side of the telescopic moving part A telescopic collection cavity is provided, and a soil moisture sensor is provided in the telescopic collection cavity, and the first pusher is provided on the driving rod with the same number as the telescopic moving parts; the advantage is that it can be buried in the soil and can collect and collect soil at different depths. Analysis of its water content, thus making it more objective to reflect the migration of the soil wetting front and its response to rainfall.

The invention discloses a method and a special device for measuring soil hydrodynamic parameters in situ in the field. The method is characterized in that a measuring system comprises a water supply pipe 1 and an infiltration chamber 2 which are connected with each other; and the radius of the infiltration chamber is larger than that of the water supply pipe; therefore, the observing accuracy of the infiltration process is improved; and according to the invention, the saturated hydraulic conductivity and wetting front suction force of the coil are figured out according to a continuous falling head vertical infiltrating principle; the measuring process of the soil hydrodynamic parameters is simplified; the measuring time and the cost are saved; the method and the special device can be achieved in technology; and moreover, the equipment price is greatly reduced and the method and the special device are easy to promote and apply.