59 results about "Earthquake risk" patented technology

The invention discloses a seismic isolation control method having anti-girder-falling and anti-collision functions and a seismic isolation control structure, belonging to the field of the seismic isolation technology for bridges. According to the invention, measurement devices positioned between a main girder I and a bridge pier and a main girder II and the bridge pier are utilized respectively to acquire data in real time and transmit the data to a control module; the control module is used for analyzing and judging the lap-jointing status of the main girder I and the bridge pier and the main girder II and the bridge pier, and the distance status and the lap-jointing length variation tendency of the main girder I and the main girder II in real time in combination with the acquired data, and is used for adjusting the input voltages of damping devices between the main girder I and the bridge pier and between the main girder II and the bridge pier respectively, so as to control the movements of the main girder I and the main girder II relative to the bridge pier according to the lap-jointing status of the main girder I and the bridge pier and the main girder II and the bridge pier, and the distance status and the lap-jointing status variation tendency of the main girder I and the main girder II. The method can prevent a collision between the falling girder and the adjoined main girder, and can comprehensively improve the earthquake risk resisting ability of the bridge structure.

The invention provides a monitoring data processing method for earthquake forecasting, an earthquake forecasting method and a system thereof, wherein the methods and the system relate to the field ofdisaster early warning. Through arranging an earthquake precursor monitoring point in a pre-monitoring area, the change characteristics of a surface physical field and a chemical field at the earthquake precursor monitoring point caused by internal earth activities are monitored, and furthermore measurement data which are related with the change characteristics of the surface physical field and the chemical field caused by the internal earth activities are obtained. Statistics are performed on the measurement data, and earthquake forecasting is performed on the pre-monitoring area is performedaccording to a statistics result. Because monitoring to the change characteristics of the surface physical field and the chemical field caused by internal activity of the earth is novely presented, all-weather monitoring to the earthquake and real-time data updating are realized. Through data analysis, early warning can be generated for an earthquake risk. Therefore the people in an earthquake area can perform risk avoiding measures in advance, thereby reducing causality and property loss of wide population.

The invention discloses a multi-well combined artificial heat storage construction system based on hot dry rock and a construction method. A new idea for artificial heat storage construction based onhot dry rock is provided, a well group effect on multi-well combined reservoir construction can be realized with a multi-well combined construction method as a core through integration of hydraulic fracturing, chemical stimulation and other means, communication distance between an injection well and a mining well in dry hot rock development is effectively increased, effective volume and heat exchange area of artificial heat storage are increased, long-term and low-pump-volume shear fracturing and chemical stimulation on multiple wells are continued, pumping pressure and scale are small, stressrelease process is slow, and earthquake risk can be effectively reduced; with adoption of the method, large-scale effective artificial heat storage construction for hot dry rock is realized, economicbenefit of the hot dry rock development is increased, and therefore, the requirement of commercial development is met.

The present invention discloses a bridge seismic risk probability analysis method based on performance design. The method comprises: (1) establishing a seismic vulnerability function according to an IDA method and a section (as shown in the specification) analysis method; (2) according to a seismic risk probability analysis method, establishing a seismic hazard function at the bridge site; (3) establishing a seismic risk probability function in the design reference period according to the obtained seismic vulnerability function and the seismic hazard function; and (4) according to the design theory of the seismic risk probability function and seismic performance, perform performance analysis on the bridge. According to the seismic risk probability analysis method based on performance design provided by the present invention, whether the bridge structure satisfies objectives of each level of seismic performance based on performance design can be determined in a probabilistic manner, thevulnerable damage position of the bridge structure under the seismic action can be further determined, and the method has certain guiding significance to seismic loss assessment and maintenance operation management of bridges.

The invention relates to an anti-seismic technology analysis method, in particular to a performance seismic oscillation risk analysis method based on a three-layer data set neural network. The methodcomprises the following steps of: (1) performing seismic oscillation data acquisition and data noise removal; (2) performing data characteristic parameter extraction and initialization processing; (3)generating a training set, an interval set and a test set ; (4) training a multi-layer neural network based on the training set; (5) training a neural network output value based on the interval set,and calculating a mean value and a standard deviation of the relative errors of the output value; (6) training the neural network based on the test set to determine an output value, and calculating amagnitude interval based on interval confidence; (7) performing probabilistic earthquake risk analysis, and determining the annual transcendental probability and recurrence period of a performance earthquake; and (8) based on performance seismic oscillation and consistency probability, determining the magnitude and epicenter distance of performance seismic oscillation. And a new neural network training method is adopted to predict a seismic oscillation attenuation relationship, so that the universality and toughness of the attenuation relationship are improved.

The invention relates to the field of tunnel risks, and provides a shield tunnel risk assessment method considering uncertainty of an earthquake vulnerability model. The method comprises the followingsteps: (1) determining various earthquake vulnerability models FC1, FC2 to FCn of tunnels in the same type; (2) establishing a vulnerability model FC0 considering uncertainty; (3) selecting a certainearthquake intensity PGA; (4) setting a sampling frequency N, and sampling the vulnerability model FC0 in the step (2) to obtain N groups of discrete probabilities P0, P1, P2 and P3 of different damage states; (5) obtaining N groups of average expected losses lsm1 according to the step (4); (6) calculating the average expected loss lsm2 of each quantile; (7) repeating the steps (3)-(6) to obtainthe average expected loss lsm of different PGAs; and (8) obtaining a risk index R value based on the result of the step (7). The scheme provided by the invention has the beneficial effects that errorscaused by a single model can be reduced, different vulnerability curve models are comprehensively considered, and the tunnel earthquake risk is analyzed more reasonably.

The invention discloses a method for establishing a pulse seismic oscillation response model taking a mountain terrain effect into consideration. A near-fault area tends to generate strong pulse seismic oscillation, and the mountain terrain can cause obvious amplification effect on pulse earthquake. According to the method, by comparing the acceleration spectrums of a trapezoid mountain model anda free field model under the action of pulse seismic oscillation, the obvious amplification effect of mountain terrains on pulse seismic oscillation is verified. Therefore, when the mountainous area is subjected to near-fault region earthquake risk evaluation, the amplification effect of mountain terrain on pulse seismic oscillation needs to be considered, so that pre-seismic disaster prevention and evaluation, earthquake-time emergency response and post-earthquake reconstruction planning can be realized in a manner of being closer to the actual situations.

The invention is suitable for the technical field of regional earthquake risk assessment, and provides a highway bridge earthquake vulnerability analysis method and device and terminal device.The method comprises the steps that a bridge failure probability model is determined according to a bridge structure and earthquake vibration characteristics; establishing a bridge fine finite element model and performing nonlinear dynamic time-history analysis on the bridge fine finite element model to obtain a linear relationship between the seismic oscillation intensity index and the seismic demand of the seismic related component; calculating a bridge failure probability according to the linear relation and a bridge failure probability model; an artificial neural network is adopted to learn the incidence relation between the bridge structure and the bridge failure probability and between the seismic oscillation characteristics and the bridge failure probability, a plurality of highway bridge seismic vulnerability models are obtained, the highway bridge seismic vulnerability models are trained, and a highway bridge seismic vulnerability optimal model is obtained. And determining the earthquake vulnerability of the highway bridge based on the highway bridge earthquake vulnerability optimal model. According to the invention, the earthquake vulnerability of the highway bridge can be rapidly and accurately obtained.

The invention relates to a Mindlin solution-based earthquake ground surface fracture permanent displacement estimation method. The method comprises the following steps of 1, determining a potential source of an area where an active fault is located and the maximum magnitude Mu of the potential source in combination with data; 2, setting the magnitude and epicentral distance of the earthquake by adopting a maximum probability method; 3, fault model parameters are determined; and 4, on the basis of the determined fault model parameters, establishing a finite seismic source model based on a Mindlin solution, and applying the finite seismic source model to seismic surface permanent displacement estimation. According to the method, a fault model and potential source region parameters of a Chinese fourth-generation seismic zoning map are fully utilized, an earthquake risk analysis method is combined, a Mindlin solution is applied to estimation of the seismic surface permanent displacement, and a seismic surface permanent displacement field near a seismic fault is subjected to numerical simulation.

The invention relates to a method for modifying the aseismic importance coefficient of a bridge, which mainly considers four evaluation indexes, including an evaluation index R1 considering earthquakevulnerability, an evaluation index R2 considering earthquake risk, an evaluation index R3 considering bridge series connection and an evaluation index R4 considering road parallel connection. The seismic importance correction coefficient R is obtained by multiplying four evaluation indexes, R = R 1 * R 2 * R 3 * R 4. The modified seismic importance coefficient is obtained by multiplying the original seismic importance coefficient by the seismic importance correction coefficient R. The technical scheme of the invention can greatly improve the economy of the bridge design in the dense area of the road network, and has important practical significance.

The invention relates to the field of mine earthquake risk assessment in a coal mining process, in particular to a method for assessing mine earthquake risk caused by overlying strata key layer fracture in the coal mining process, which comprises the following steps of: calculating theoretical fracture step pitch and released energy of a key layer; evaluating whether the key layer can be broken or not; the mine earthquake intensity caused by key layer fracture is evaluated; evaluating the potential influence of mine earthquakes on the earth surface; and evaluating the potential influence of the mine earthquake on the underground. According to the method, a technical means for scientifically evaluating the mine earthquake risk is provided for a mine, the mine earthquake risk source and the risk level can be effectively identified, then mine earthquake disaster prevention and control measures are formulated in a targeted mode, the mine earthquake risk is reduced to the maximum extent, rock burst disasters induced by mine earthquakes are weakened or even eliminated, and safe production of the mine is guaranteed.

The invention relates to the technical field of earthquake risk assessment, particularly provides a power grid facility anti-seismic safety risk assessment method and device, and aims to solve the technical problem of how to integrally and comprehensively know the specific influence range and intensity distribution of a certain earthquake event and the relevant information of an earthquake source position. The method comprising the steps of analyzing seismic intensity of a position where a power grid facility is located during an earthquake; calculating safety coefficients of all the power grid facilities within an earthquake influence range based on the seismic intensity of the positions of the power grid facilities; and carrying out risk assessment on all the power grid facilities in the earthquake influence range based on the safety coefficients of all the power grid facilities in the earthquake influence range. According to the technical scheme provided by the invention, the overall influence range and intensity distribution of the earthquake can be displayed through a map, the complete information of the earthquake can be displayed, further, the earthquake influence degree of the electric power facility can be matched through a map matching mode, and the facility does not need to have monitoring point monitoring data.

The invention relates to a base isolation-tuned mass damper shock isolation and vibration absorption device for a nuclear power plant without earthquake risk. The base isolation-tuned mass damper shock isolation and vibration absorption device is characterized by comprising a base shock isolation base structure and a tuned mass damper structure. The tuned mass damper structure is of a shell structure with a circular cross section, and includes a tuned mass damper main structure and a tuned mass damper substructure. The main structure and the substructure are connected by at least two tuned mass damper support units, and the substructure is located above the main structure. Each of the tuned mass damper support units is composed of support stiffness and support damping, and is sealed by a flexible sealing device. The tuned mass damper main structure is connected with the base shock isolation base structure through at least two base shock isolation support units, and each of the base isolation support units is composed of support stiffness and support damping. The base isolation-tuned mass damper shock isolation and vibration absorption device for the nuclear power plant without earthquake risk is good in seismic robustness and stable in shock absorption effect, and has no special requirements of a site, implementation of the device is simple, and the anti-seismic safety of the structure of the nuclear power plant is greatly improved.