34 results about "Earthquake engineering" patented technology

The invention belongs to the technical field of geotechnical engineering disaster prevention and reduction and earthquake engineering tests, and relates to a vibration table test method considering time-varying deterioration of anti-seismic performance of an anchored rock slope. The method comprises the following steps: firstly, constructing a dynamic performance time-varying deterioration model based on an anchoring system interface bonding force and a free section steel bar yield resistance attenuation rule; physical equivalent simulation of interface degradation and component yield resistance reduction is realized by regulating and controlling the proportion of rock mass similar materials and utilizing a graded rigidity anchoring system. The core of the method is that before a vibration table applies seismic waves, attenuation of the anchoring performance of a supporting structure is actively simulated in advance, so that a real evolution path that the bearing capacity of an anchoring system is reduced firstly, slope stress redistribution and accumulated damage are caused, and then sudden seismic loads are suffered is reproduced; the limitation that only the static low bearing capacity is simply simulated in a traditional test is broken through. According to the method, space-time coupling of static time-varying degradation accumulation and transient earthquake dynamic action is effectively achieved, the problems of interface degradation simulation distortion and the like are solved, and a reliable test method is provided for dynamic stability evaluation and reinforcement design of a long-term service anchoring slope.

A seismic energy estimation method based on generalized spherical wave propagation, relating to the field of earthquake engineering. The method comprises: determining initial seismic total energy and seismic power on the basis of seismic source characteristics and a seismic magnitude; determining a generalized spherical wave equation, and calculating an average energy flow density of propagated waves on the basis of the wave equation of spherical waves; using an earth surface spherical crown, which is projected on the zone of a seismic source surface, as a main impact zone of seismic spherical waves on an earth surface, the main impact zone being equivalent to a square and performing grid division, and calculating the hypocentral distance between the center of each grid and the center of a seismic source so as to form a hypocentral distance matrix; and expressing the generalized spherical wave energy flow density of each grid as the sum of the energy flow density of longitudinal waves and the energy flow density of transverse waves, performing grid subdivision, estimating the average amplitude of each subdivided grid mass unit within a seismic action period, and evaluating the seismic action energy of a site. The present invention estimates the action of seismic energy on the earth surface by defining the generalized spherical wave propagation of seismic source energy, thereby more accurately evaluating the distribution condition of seismic energy on the earth surface.

The present application relates to the field of geotechnical engineering and earthquake engineering, in particular to a method for calculating the nonlinear buried super-barrier Rayleigh wave dispersion relation in the foundation. The method comprises: obtaining the structure data of the nonlinear buried super-barrier resonance layer, and obtaining the relative motion equation according to the structure data and the relative displacement; obtaining the total displacement amplitude by analyzing the relative motion equation; obtaining the first motion control equation by using the inner and outer displacement amplitudes; deriving the first displacement component and the first stress component according to the first motion control equation; constructing the second motion control equation, and deriving the second displacement component and the second stress component by using the second motion control equation; and obtaining the dispersion relation curve based on the first displacement component, the first stress component, the second displacement component and the second stress component. The method solves the problems in the prior art, such as the dependence on experience trial and error or large-scale numerical simulation for super-barrier vibration isolation design and low-frequency vibration suppression, and the insufficient prediction accuracy of dispersion characteristics.

The invention discloses a covering layer foundation soil dynamic pore pressure-deformation indoor triaxial test method for reflecting an earthquake loading process, and belongs to the field of geotechnical engineering and earthquake engineering. Firstly, a numerical geometric model is created, and soil physical and mechanical parameters are input; secondly, carrying out power time history response analysis, outputting seismic dynamic stress response time histories of soil mass units at different positions and different depths in a numerical simulation result, and converting the seismic dynamic stress response time histories into test control loads; thirdly, carrying out an indoor dynamic test, loading a test control load, and collecting dynamic response data of the soil body under the earthquake action; and finally, on the basis of the dynamic response data, determining dynamic test results of all units of the covering layer by adopting an interpolation method according to stress states and dynamic strain amplitude interpolation, and completing dynamic characteristic analysis. According to the method, excessive simplification and blind test of a traditional test can be avoided, the authenticity and accuracy of the foundation soil dynamic test are remarkably improved, and the method is suitable for accurate evaluation of the dynamic characteristics of the ultra-deep soft covering layer foundation soil.

The invention discloses a method and system for calculating a seismic oscillation amplification coefficient of a river valley field under SV wave incidence, and belongs to the technical field of rock-soil seismic engineering, and the method comprises the steps: building a model; analyzing an infinitesimal body; establishing a free field; establishing a scattering field; substituting boundary conditions; solving a matrix equation; and calculating an amplification coefficient. According to the method, a wave field caused by an irregular terrain of the earth surface is constructed by an interval decomposition strategy taking a terrain cuspidal point as a demarcation point, a method for calculating the seismic oscillation amplification coefficient of the river valley field under SV wave incidence is provided, and the influence of factors such as river valley geometric parameters, material parameters, the frequency and incident angle of incident waves and the like on the river valley seismic oscillation amplification coefficient is revealed; a theoretical basis is provided for aseismic design of major projects of river valleys; the calculation method is a semi-analytical method, reveals the physical nature of irregular terrains on seismic wave propagation and scattering, improves the calculation precision and efficiency, and can be used as a reference for verification of a numerical method.

The invention discloses an earthquake sand liquefaction deformation prediction method based on machine learning, and relates to the technical field of earthquake engineering and machine learning. Missing value processing, abnormal value detection, feature selection and standardization processing are carried out on the multi-source coupling seismic data set to obtain a seismic sand liquefaction deformation data set, a seismic sand liquefaction deformation prediction model is constructed according to the seismic sand liquefaction deformation data set, the root-mean-square error, the mean absolute error and the decision coefficient of the model are calculated, and the seismic sand liquefaction deformation prediction result is obtained. And according to corresponding threshold judgment, carrying out hyper-parameter adjustment on the model through Bayesian optimization or carrying out model packaging through Flask, processing the obtained new seismic sand liquefaction characteristic data, and inputting the processed data into the packaged model to obtain a seismic sand liquefaction deformation prediction result. The method can effectively predict earthquake sand liquefaction deformation, and provides support for earthquake disaster prevention and engineering design.

The present application relates to railway route selection technical field, and relates to a kind of railway route selection scheme across seismic fault's total probability risk assessment method.The assessment method uses Monte Carlo simulation, establishes the total probability risk analysis model suitable for railway route selection design across fault zone, is based on the theory of performance-based earthquake engineering, integrates fault zone displacement probability risk analysis, railway structure object probability vulnerability analysis and railway fault rear probability economic loss analysis, can be combined with fault zone characteristics (position, geometric shape, seismic intensity) The annual exceedance probability of specific displacement value is calculated, the damage state of different railway structure (usually avoid using bridge mode to cross fault zone, therefore, the present application mainly considers the intersection of tunnel, embankment section and fault zone) under the influence of fault displacement is evaluated, simultaneously, total probability risk analysis model across fault zone and cost minimization model form cost-risk net present value model, and construction cost and cross-fault zone risk are simultaneously evaluated.

This invention discloses a seismic treatment effectiveness evaluation system for thick loess sites, belonging to the fields of geotechnical engineering and earthquake engineering technology. The system comprehensively evaluates the seismic treatment effect by acquiring dynamic characteristic parameters and seismic response parameters of thick loess sites before and after seismic treatment. The system includes a site foundation parameter acquisition module, a dynamic characteristic parameter acquisition module, a loess dynamic degradation characteristic analysis module, a seismic response simulation module, a seismic treatment effectiveness quantification module, and an evaluation result output module. Specifically, it analyzes the loess dynamic degradation characteristics based on parameters such as shear wave velocity, shear modulus, and damping ratio, and acquires seismic response results such as surface acceleration, shear strain, and site amplification factor under the same seismic motion input conditions. By normalizing and weighting the dynamic degradation improvement index and the seismic response improvement index, a comprehensive seismic treatment effectiveness index is constructed, enabling quantitative evaluation and classification of seismic treatment effectiveness.

The embodiment of the invention discloses a non-stationary seismic oscillation generation method and device, electronic equipment and a storage medium, and relates to the technical field of seismic engineering, and the method comprises the steps: 1, generating a seed seismic oscillation time history based on a power spectrum model; 2, performing wavelet packet decomposition on the seed seismic oscillation time history to obtain a group of sub-signal components in a time-frequency domain, and identifying a strong seismic time period; 3, constructing a time-varying function, and correcting sub-signal components in a strong earthquake time period; 4, reconstructing and generating an intermediate seismic oscillation time history according to the adjusted sub-signal components, and judging whether the intermediate seismic oscillation time history meets a preset precision requirement or not; if not, taking the intermediate seismic oscillation time history as a new seed seismic oscillation time history, and repeating the steps until a preset precision requirement is met; through time domain localization correction, the contradiction between response spectrum matching and intensity non-stationary maintenance is solved, seismic oscillation which accords with a target response spectrum and has real non-stationary characteristics is generated, and the reliability of anti-seismic analysis is improved.

The invention relates to the technical field of seismic engineering and geological disaster prevention and control, and discloses a slope seismic oscillation comprehensive risk assessment method considering gradient-incident angle-back-facing slope three-dimensional coupling, and the method comprises the steps: building a three-dimensional double-sided slope dynamic response model, laying monitoring points on a flat ground in front of a slope and slope surfaces at two sides, and carrying out the construction of a three-dimensional double-sided slope dynamic response model; setting free field boundaries around the model, inputting seismic waves subjected to polynomial baseline correction processing, and calculating peak acceleration amplification coefficients under the conditions of different gradients, incident angles and slope orientations; on the basis, a sensitive incident angle threshold weight and a back-facing slope asymmetric weight are introduced, a normalized amplification coefficient is combined, a gradient-incident angle-back-facing slope three-dimensional coupling comprehensive risk index is constructed, and unified quantification and grading evaluation of risk intensity under the conditions of different gradients, different incident angles and different slopes are achieved. The method can systematically reveal the coupling rule of the double-slope seismic oscillation amplification effect, and provides a scientific basis for the seismic design of mountainous engineering and regional seismic damage risk assessment.

The invention belongs to the field of rock-soil earthquake engineering, and particularly relates to a method for evaluating the anti-seismic performance of an end bearing pile in stratified soil under the action of earthquake S waves. According to the method, a pile-soil model is established on the basis of a continuous medium theory under a linear elastic frame, and displacement of a free field and a scattered field of a soil body is decoupled through a Helmholtz decomposition method; the soil layer boundary is processed by adopting the orthogonality of a modal function characteristic function, and the motion response of the pile foundation is described by adopting a strict closed form solution. Frequency domain amplitude-frequency characteristic analysis is adopted, a motion corresponding coefficient and a motion amplification coefficient are introduced to quantitatively evaluate the influence of the soil layer thickness and the soil layer rigidity ratio on the anti-seismic performance of the end bearing pile, and theoretical support is provided for pile foundation optimization design.

The invention provides a method for determining seismic oscillation parameters of a deep and thick covering layer site, and belongs to the field of geotechnical engineering and seismic engineering.The method comprises the steps that firstly, the thickness and the average shear wave velocity of a site covering layer are obtained, and the site characteristic period is calculated; then establishing a site related target spectrum model comprising an ascending section function, a resonance section function and a descending section function; determining key control parameters of each function based on the site characteristic period, wherein the key control parameters comprise an ascending section inflection point period, a resonance section center period and a descending section attenuation index; integrating the three functions through a smooth connection technology to form a complete target spectrum; and finally generating site specific seismic oscillation parameters based on the target spectrum. Through systematic model construction and a parameter determination mechanism, accurate description of the seismic oscillation characteristics of the deep and thick covering layer field can be realized, the physical rationality and engineering applicability of the seismic oscillation parameters are improved, and a reliable basis is provided for engineering aseismic design.

The present application relates to the technical field of earthquake engineering, and provides a method for determining the seismic response of an engineering site under the action of a seismogenic fault, comprising the following steps: S1, determining the bedrock surface of the engineering site; S2, establishing the scale range of the engineering site; S3, selecting near-fault ground motion records and site categories for inputting seismic waves; S4, outputting the site response under the input of ground motion; and S5, outputting the site response under the input of dislocation. 地表 The dislocation input of the finite element software site earthquake is used to obtain the surface displacement deformation characteristics and select the maximum displacement value D 位移 The present application provides a method for selecting near-fault ground motion records considering dislocation in a consistent manner for the site classification of the input mode of the calculation and analysis of the seismogenic fault engineering site, respectively strips the seismic input of the acceleration time history and the bedrock dislocation amount input, and is closer to the actual earthquake disaster, so as to provide reasonable design parameters for the seismic design of the engineering structure and the design of the anti-fracture capacity.

The present application belongs to the field of geotechnical engineering disaster prevention and mitigation and earthquake engineering test technology, and relates to a shaking table test method considering time-varying degradation of seismic performance of anchored rock slope. The method first constructs a dynamic performance time-varying degradation model based on the attenuation law of the interface bonding force of the anchoring system and the yield resistance of the free section reinforcement; by adjusting the proportion of the rock similar material and using a staged stiffness anchoring system, the physical equivalent simulation of interface degradation and component yield resistance reduction is realized respectively. The core of the present application is that before the shaking table applies the seismic wave, the anchoring performance degradation of the supporting structure is simulated actively in advance, so as to reproduce the real evolution path that the bearing capacity of the anchoring system decreases first, leading to stress redistribution and cumulative damage of the slope, and then suffering from sudden seismic load, breaking through the limitation of traditional test which only simply simulates static low bearing capacity. The present application effectively realizes the space-time coupling of "static time-varying degradation accumulation" and "instantaneous seismic dynamic action", solves the problem of simulation distortion of interface degradation, and provides a reliable test method for dynamic stability evaluation and reinforcement design of long-term service anchored slope.

The invention discloses a two-dimensional seismic performance evaluation method, device and product for a large-diameter shield tunnel, and relates to the field of tunnel engineering and seismic engineering, the method comprises the steps that a performance evaluation matrix with two orthogonal dimensions is constructed, and the two orthogonal dimensions are the main lining damage level and the internal component damage level; obtaining a main lining damage index and an internal component damage index of the target large-diameter shield tunnel under different seismic intensities; determining a joint condition probability density function between the main lining damage index and the internal component damage index under each earthquake intensity, thereby determining the probabilities of the target large-diameter shield tunnel in different states under the corresponding earthquake intensity; and generating an earthquake performance evaluation result of the target large-diameter shield tunnel according to the probability that the target large-diameter shield tunnel is in different states under each earthquake intensity. According to the method, the seismic performance of the target large-diameter shield tunnel facing different seismic intensities can be accurately and finely evaluated.

The invention relates to the technical field of seismic engineering, in particular to a method and a system for predicting a surface peak acceleration amplification coefficient. The method comprises the following steps: establishing a regional seismic intensity attenuation relation model based on a single random variable weighted least square method for carrying out regression analysis, and establishing a regional bedrock seismic oscillation attenuation relation model based on a step-by-step regression conversion method, proposing estimation of the amplification coefficient of the peak acceleration of the earth surface based on the average shear wave velocity prediction within 30 meters below the earth surface of the hybrid model; by adopting the above mode, the precision and reliability of seismic intensity and bedrock seismic oscillation attenuation prediction are improved, the efficient and accurate estimation of the earth surface peak acceleration amplification coefficient is realized, and the scientificity and effectiveness of earthquake risk assessment and aseismic design can be enhanced.

The invention discloses a method and a system for analyzing vibration of a pile foundation in saturated soil under the action of an earthquake load, a storage medium and application of the storage medium. Relates to the crossing field of geotechnical engineering and seismic engineering, and mainly researches the motion response of a large-diameter end bearing pile in a transverse isotropic viscoelastic saturated soil body under the action of seismic longitudinal waves. Based on a de Boer porous medium theory, a fractional order viscoelastic constitutive model is introduced into a transverse isotropic saturated soil dynamic control equation, and a displacement-pore pressure coupling wave equation is established. A variable separation method is adopted for analyzing and deducing counter force of soil around a pile, longitudinal vibration of the pile is simulated into a Rayleigh-Love rod model considering the transverse inertia effect, scattered wave components in a total wave field are separated through a wave field decoupling technology, and a soil-pile interaction mechanism is accurately analyzed. The method provides an innovative theoretical framework for the analysis of the fluctuation-driven soil-pile system in the coastal soft soil area, and is particularly suitable for high-precision evaluation of the interaction between the pile foundation and the saturated soil body power in earthquake engineering.

The application discloses a kind of ground fissure zone tunnel lining earthquake response and damage evolution simulation method and equipment, it is related to the field of earthquake engineering.The present application is based on the constructed shaking table model, and a numerical simulation model is established by using the modified lattice spring-discrete crack network coupling numerical method, then, MLSM-DFN model of the ground fissure zone tunnel structure profile is constructed based on the numerical simulation model, and the earthquake response and damage simulation of the ground fissure zone tunnel lining are completed based on this model, the expansion and propagation law of the ground fissure can be completely and truly simulated, the activity development trend of the ground fissure can be accurately predicted and quantitatively characterized, meanwhile, the influencing factors and action mechanism of the coupled dynamics response induced tunnel structure failure can be accurately judged, to better, targetedly carry out tunnel structure seismic design provide more explicit theoretical basis and technical support.

The invention belongs to the technical field of seismic engineering, and relates to a seismic magnitude calibration method based on a seismic source dynamics mechanism, which comprises the following steps: determining seismic source parameters in a target area, and establishing a dynamic seismic source model according to seismic fault information in the target area; obtaining a digital elevation model (DEM) of a target area, processing DEM data, establishing a three-dimensional site model of the target area, and obtaining geological parameters; and determining a friction constitutive relationship, carrying out high-precision seismic oscillation simulation by adopting a spectral element method on the premise of not changing geometric factors of the model, obtaining seismic oscillation characteristics, determining a proportional coefficient value corresponding to a current fault, and then carrying out magnitude calibration work. Compared with the prior art, the method has the beneficial effects that the calculation efficiency is high, the modeling method is simple, the effectiveness of the calculation result can be improved, and the earthquake magnitude calibration precision can be improved, so that a more reliable scientific basis is provided for disaster prevention and reduction design of regional infrastructures.

The application discloses a method and system for determining seismic energy and ground motion amplification coefficient under complex terrain geological conditions based on energy method and artificial intelligence, and belongs to the technical field of earthquake engineering and geotechnical engineering. The method comprises the following steps: determining the energy of a seismic source; calculating the energy attenuation on the seismic wave propagation path; calculating the energy transformation of different geological interfaces; extracting terrain feature parameters and constructing a training database to train a deep neural network to determine the energy distribution coefficient of a complex combined terrain; predicting the energy distribution coefficient of each point of a target site; combining the incident energy of bedrock to calculate the ground motion amplification coefficient and perform energy conservation correction; and finally outputting an amplification coefficient distribution map. The application combines physical mechanisms with artificial intelligence, can efficiently and accurately predict the ground motion amplification effect of complex combined terrains (such as mountain groups and valleys), and the result conforms to energy conservation, so that the application can provide a scientific basis for seismic zoning and engineering seismic design.

The invention relates to the technical field of seismic engineering, and discloses a broadband seismic oscillation artificial synthesis method for cross-fault linear engineering, which is suitable for seismic oscillation input and anti-seismic performance evaluation of linear engineering such as bridges, tunnels, highways and railways which pass through active fault zones. According to the method, based on a set earthquake scene, a high-frequency non-stationary seismic oscillation component, a permanent displacement component related to a sliding impulse effect and a speed pulse component related to a directional effect are simulated respectively, and broadband seismic oscillation with high and low frequency coupling, spatial coherence and inconsistent input characteristics is constructed through frequency domain synthesis. The method not only can accurately reproduce the specific permanent displacement and directional speed pulse characteristics of near-fault seismic oscillation, but also can effectively describe the non-consistency difference of the seismic oscillation on the two sides of the fault in the aspects of amplitude, frequency and response mode, and the non-consistency difference is represented as the difference of the reverse symmetric displacement of the strike-slip fault and the displacement of the upper and lower walls of the tilt-slip fault.

This invention provides a method for estimating seismic energy based on generalized spherical wave propagation, relating to the field of earthquake engineering. This method determines the initial total energy and seismic power of an earthquake based on its source characteristics and magnitude; it determines the generalized spherical wave equation and calculates the average energy flux density based on this equation; it treats the Earth's surface spherical cap projected onto the source surface as the main influence range of the seismic spherical waves on the surface, equates it to a square, and divides it into grids. The source distance between the center of each grid and the source center is calculated, forming a source distance matrix; the generalized spherical wave energy flux density of each grid is expressed as the sum of the energy flux densities of P-waves and S-waves; the grid is further subdivided to estimate the average amplitude of each subdivided grid mass unit during the seismic period, thus assessing the seismic energy at the site. By defining the generalized spherical wave propagation of source energy, the method estimates the effect of seismic energy on the Earth's surface, providing a more accurate assessment of the distribution of seismic energy on the surface.

The present application belongs to the field of earthquake engineering and geotechnical shock absorption and disaster prevention, and discloses a site ground motion amplification factor reduction system and method based on deep energy dissipation well. In view of the limitation of the existing ground treatment, foundation isolation and wave barrier technology which adopts the idea of "resisting" or "avoiding" seismic wave energy, the present application obtains the resonance frequency and mode shape distribution of the overburden layer through a site resonance characteristic acquisition unit, determines the well position, well depth and energy dissipation device parameters through an energy dissipation well layout scheme design unit, and then sets the energy dissipation and absorption device at the energy concentration position of the overburden layer through a deep energy dissipation well structure. When an earthquake occurs, the energy is transmitted to the energy dissipation device through the coupling of the well wall and the soil, and the wave energy is converted into heat energy and dissipated through irreversible mechanisms such as viscosity, plasticity and friction, so as to break the positive feedback of resonance and effectively suppress the site amplification effect, with small construction amount and easy maintenance.

The invention relates to the technical field of railway line selection, and relates to a total probability risk assessment method for crossing earthquake fracture in a railway line selection scheme. According to the evaluation method, Monte Carlo simulation is adopted, a cross-fault-zone total probability risk analysis model suitable for railway line selection design is established, on the basis of a performance-based seismic engineering theory, fault zone displacement probability risk analysis, railway structure probability vulnerability analysis and railway post-fracture probability economic loss analysis are integrated, and the fault zone displacement probability risk analysis, the railway structure probability vulnerability analysis and the railway post-fracture probability economic loss analysis are integrated. According to the method, the annual exceeding probability of a specific displacement value can be calculated in combination with fault zone characteristics (position, geometric morphology and earthquake intensity), the damage state of different railway structures (generally avoiding crossing the fault zone by adopting a bridge mode) under the influence of the fracture displacement is mainly considered, and meanwhile, the damage state of the different railway structures under the influence of the fracture displacement is evaluated. And the cross-fault-zone probability risk analysis model and the cost minimization model are combined to form a cost-risk net present value model, and the construction cost and the cross-fault-zone risk are evaluated synchronously.

This invention provides a method for predicting seismic intensity parameters that considers the effects of complex terrain, belonging to the field of earthquake engineering technology. By introducing terrain data such as elevation, slope, and curvature, this invention constructs a comprehensive terrain effect coefficient formula, correcting existing seismic prediction equations and comprehensively considering the amplification effect of terrain on seismic motions. This allows for more accurate prediction of seismic intensity parameters in areas with complex terrain.

This application relates to the field of earthquake engineering and discloses a method for quantifying the uncertainty of complex ground motions and a stochastic simulation system. The method first identifies non-stationary ground motions, mainshock and aftershock sequences, and near-fault pulse ground motions that meet the requirements in measured ground motion records, and uses an evolved power spectral density model to identify their parameters. Then, based on Copula theory, a high-dimensional nonlinear correlation joint probability distribution model of the parameters is constructed. Simultaneously, a high-order Hermite polynomial model is established to achieve non-Gaussian transformation, and the autocorrelation function mapping relationship is derived to reproduce the non-Gaussian properties. In the simulation stage, by combining representative point set selection, POD spectral representation, and non-Gaussian mapping, non-Gaussian ground motion time history samples consistent with the characteristics of measured records are efficiently synthesized. This invention can accurately quantify and simulate the stochastic uncertainty of complex ground motions, improving the realism of the simulation samples and computational efficiency.

The invention provides an active fault finite fault source model construction method and system, and relates to the technical field of seismic engineering, and the method comprises the steps: collecting seismic observation data, tremor monitoring data and borehole wave velocity test data; geometric parameters such as fault length, width, burial depth, trend and inclination angle are extracted; calculating scalar seismic moments and moment magnitudes; fault plane sliding distribution is established by adopting a concave-convex body model and a k-square sliding model; constructing a three-dimensional fault dynamic model by adopting a double couple point source superposition method; according to the method, a coupling mechanism of geometric parameters and kinetic parameters of the fault is established, and complete seismic source input parameters are provided for near-fault strong ground motion simulation.

The application discloses a seismic motion prediction model correction method and system, and relates to the technical field of earthquake engineering safety. The method comprises the following steps: obtaining strong earthquake observation data of a target region and a preselected reference seismic motion prediction model corresponding to the target region; extracting a plurality of regional characteristic parameters of the target region according to the strong earthquake observation data, and constructing a plurality of characteristic correction terms of the reference seismic motion prediction model according to the plurality of regional characteristic parameters; wherein the plurality of regional characteristic parameters at least comprise a non-elastic attenuation coefficient, a geometric diffusion coefficient, a crust amplification factor and a stress drop; correcting the reference seismic motion prediction model according to the plurality of characteristic correction terms, generating a plurality of candidate seismic motion prediction models by adjusting parameter combinations of the plurality of characteristic correction terms, and combining and fusing the plurality of candidate seismic motion prediction models to obtain a corrected seismic motion prediction model of the target region. Through implementation of the application, the need of a specific region for the precision of a seismic motion prediction model can be met.

The application discloses a kind of overburden soil dynamic pore pressure-deformation indoor triaxial test methods reflecting seismic loading history, belong to geotechnical engineering and earthquake engineering field.First, create numerical geometric model, input soil physical and mechanical parameters;Second, carry out dynamic time-history response analysis, output the seismic stress response time-history of different positions, different depth soil units in numerical simulation results, and convert it into test control load;Third, carry out indoor dynamic test, load test control load, collect the dynamic response data of soil under the action of seismic motion;Finally, based on dynamic response data, using interpolation method, according to stress state and dynamic strain amplitude interpolation determines all units of overburden dynamic test results, completes dynamic characteristic analysis.The application can avoid the over-simplification and blind test of traditional test, significantly improve the authenticity and accuracy of foundation soil dynamic test, and is suitable for accurate evaluation of dynamic characteristics of super-deep soft overburden foundation soil.

This invention belongs to the technical field of geotechnical engineering and earthquake engineering, and provides a method based on CPT and V s The joint testing method for liquefaction assessment, which considers the geological age effect, can quantitatively characterize the geological age effect of soil, combine the advantages of CPT and Vs tests, and does not require precise soil age information. The technical solution adopted includes the following steps: S1, in-situ test data acquisition, including static cone penetration test and shear wave velocity test; S2, parameter normalization processing, calculating normalized cone tip resistance and normalized shear wave velocity, and then introducing the soil classification index to obtain the normalized cone tip resistance of equivalent pure sand; S3, establishing the correlation between benchmark static cone penetration test and shear wave velocity; S4, determining the geological age aging factor of soil; S5, constructing a comprehensive evaluation index considering geological age; S6, establishing a liquefaction assessment model; S7, determining the liquefaction discrimination probability threshold; S8, evaluating the site liquefaction potential.