20 results about "Material point method" patented technology

The invention discloses a landslide geological disaster deduction method and system based on an MPM method, and the method comprises the steps: collecting the multi-source data of a disaster scene, and synchronously constructing a digital twinborn model; a qualitative and quantitative two-stage inversion calibration model is adopted; a qualitative layer combines a monitored displacement direction and a deformation mode, and preliminarily inverts key parameters such as slip band cohesive force and an internal friction angle; the quantitative layer comparison model calculates the actual deformation range, collapse position and displacement, and parameters are optimized to match the actual landslide state; in landslide long-term evolution deduction, a rock-soil body aging characteristic model is embedded, an exponential function is used for describing annual scale parameter deterioration, prediction is divided into continuous analysis steps, MPM calculation is carried out based on a material point method, full-cycle simulation from the current year to the future years is completed, and deformation range, displacement and outburst risk results are output. And reliable decision support is provided for disaster prevention and reduction.

The application discloses a large deformation whole process simulation method of earthquake landslide based on a grid isolation technology and relates to the technical field of geotechnical engineering.The application constructs a separated background grid and a multi-medium model containing a safety isolation zone based on a second-order convection particle domain interpolation material point method, carries out dynamic analysis on the earthquake landslide by using a strain-driven hardening-softening coupling constitutive mechanism, realizes flexible input of the earthquake wave at the isolation zone and anti-drifting of the base, and can accurately simulate the complete evolution process of the landslide from undrained shear cracking to large deformation friction accumulation.The application effectively eliminates wave reflection interference of the dynamic boundary and numerical drift of long-time integration, realizes real physical reproduction of the whole process of the earthquake landslide from cracking to friction accumulation, makes calculation of large deformation and permanent displacement of the slope under the action of the earthquake more accurate and stable, and lays a foundation for prediction and evaluation of the whole process of the landslide disaster evolution.

The invention discloses an earthquake landslide large deformation whole process simulation method based on a grid isolation technology, and relates to the technical field of geotechnical engineering. According to the method, a separated background grid containing a safety isolation belt and a multi-medium model are constructed based on a second-order convective particle domain interpolation material point method, and dynamic analysis is performed on seismic landslide by using a strain-driven soft and hard coupling constitutive mechanism, so that flexible input of seismic waves at the isolation belt and drifting prevention of a substrate are realized; and the complete evolution process of the landslide from undrained shear crack initiation to large-deformation friction accumulation can be accurately simulated. According to the method, wave reflection interference of a dynamic boundary and numerical drift of long-lasting integral are effectively eliminated, and real physical reproduction of the whole process of seismic landslide from crack initiation to friction accumulation is realized; therefore, calculation of large deformation and permanent displacement of the side slope under the earthquake action is more accurate and stable, and a foundation is laid for prediction and evaluation of the whole evolution process of landslide disasters.

The application provides a step-by-step decomposition-space mapping three-dimensional material point material parameter random field generation method, and belongs to the technical field of water conservancy and hydropower. First, a three-dimensional geometric model of a structure is established according to engineering geological data, high-precision mesh division is carried out, each mesh is converted into a material point carrying mass and volume, and a material point model is obtained. Second, a background mesh element is determined, and a background mesh covering the space occupied by the entire structure is generated. Third, a correlation function reflecting the material parameter properties is selected, a step-by-step decomposition method is used, and a material parameter random field on the background mesh element is generated. Finally, the value of the material parameter of the material point model is determined through a space mapping technology, and a three-dimensional material point material parameter random field is generated. The application is based on the material point method, and realizes the generation of a three-dimensional random field of a geotechnical engineering material parameter through the joint application of a step-by-step decomposition-space mapping technology, thereby providing technical support for the simulation of large deformation of a geotechnical engineering considering spatial variability.

A fluid-structure interaction (FSI) simulation method for submerged boundaries based on the material point method and positional dynamics includes: a) solving for the solid state and calculating the Lagrangian elastic force of the solid; b) transferring the elastic force of the solid Lagrangian mesh vertices to the Eulerian background mesh; c) solving the Navier-Stokes fluid control equations and continuity equations on the Eulerian background mesh, feeding back the updated mesh flow field information to the particles, and updating the particle state synchronously; d) using a mapping matrix to map the positions of solid particles back to the vertices of the solid Lagrangian mesh, saving the vertex position data and fluid particle data for rendering output. This invention, through the above-mentioned hybrid Lagrangian-Eulerian perspective coupling solution, can realistically simulate the bidirectional coupling between solids of different materials and complex fluids, significantly improving the physical realism and visual fidelity of the simulation scene.

A virtual reality level simulation method based on material point method and gridding surface reconstruction belongs to the cross field of computer graphics, physical simulation and virtual reality technology. The steps are as follows: S1, storing the material point position coordinates according to the material point material number, and obtaining the bounding box boundary of the material point by traversing the coordinates; S2, defining and selecting the grid size and boundary extension distance for reconstructing the surface, and generating the grid; S3, selecting a Gaussian function to calculate the contribution of each material point to the overall material point density field, and obtaining the parameters; S4, calculating the contribution of each material point to the overall material point density field, and accumulating to obtain the overall material point density field; S5, obtaining the isosurface of the overall material point density field, and exporting it as a general three-dimensional model of a rendering engine to obtain a simulation visual effect. The method can solve the problems that the prior art cannot process ten million material points, the reconstruction parameter selection is difficult, and the connection with a high-end rendering engine is not smooth, and realizes a virtual reality level simulation visual effect.

The invention provides a landslide motion simulation method considering terrain reconstruction, and solves the logic contradiction of the traditional method for simulating the initial motion by using the landslide terrain. The method comprises the following steps: acquiring high-precision terrain, volume, geological parameters and rainfall data after landslide; the landslide terrain is used as a starting point, and the landslide terrain is restored through volume conservation, reasonable flow direction and flow and rock-soil body strength adaptive constraint iterative correction; based on a reconstructed terrain, coupling rainfall infiltration, a pore water pressure evolution model and a material point method, a landslide movement process is positively simulated, and information such as speed, acceleration and accumulation depth is inversed. According to the invention, initial condition errors are eliminated from the source, the simulation precision is high, and a scientific tool is provided for landslide mechanism research and disaster prevention and control.

The application discloses a fast Gaussian splash physical simulation method and related equipment, and relates to the technical field of physical model simulation generation. The method comprises the following steps: segmenting each object in a static three-dimensional Gaussian scene; constructing an occupancy field, and then dividing corresponding points into the interior of the object according to an occupancy probability; filling the points in the interior of the object by using a Monte Carlo importance probability sampling method; acquiring physical parameters of the object for simulation of a material point method according to a text description by using a large language model; and generating simulation results of each object according to the physical parameters. The application firstly segments an input static three-dimensional Gaussian scene, then obtains a preliminary filling result by using an occupancy field, and then fills a complex structure according to Gaussian importance by using the Monte Carlo importance probability sampling method proposed in the application. The text physical optimization based on the large language model proposed in the application can quickly optimize and determine the physical parameters of the object, and obtain stable simulation results.

The invention discloses a subsurface erosion simulation numerical method based on a semi-implicit two-phase substance point method, and relates to the technical field of geotechnical engineering numerical simulation, and the method comprises the following steps: generalizing unsaturated easily subsurface-eroded accumulated soil into a two-phase multi-component medium based on a mixture theory; establishing a solid-liquid double-phase double-layer grid system; establishing a core control equation of seepage subsurface erosion in the soil body; transferring the material point information of the solid phase and the liquid phase to corresponding background grid nodes in the double-layer grid system; applying a boundary condition on a background grid of the double-layer grid system, and carrying out semi-implicit solution on the core control equation; mapping the obtained node speed to a substance point; judging whether the relative velocity of the solid phase and the liquid phase exceeds a seepage velocity threshold value or not; state variable information carried by the two-phase substance points is updated; correcting permeability and saturation; and judging and calculating whether the specified time is up or whether the soil body reaches the yield limit. The method provided by the invention has important theoretical and engineering practical values for solving the difficulty in simulating the subsurface erosion disaster of the accumulated soil.

The application discloses a kind of soil and rock mixture mixed representation and concurrent solving method, comprising: after determining the soil and rock block of target soil and rock mixture, soil is modeled with material point method, and the material point corresponding to soil is generated, rock block is modeled with discrete element method, and the discrete unit corresponding to rock block is generated;The interaction between soil and rock block is described with a preset contact model;The virtual radius of each material point is calculated;And determine the material point in contact with discrete unit, marked as virtual particle;The coupling contact force of virtual particle and discrete unit is calculated using discrete element contact model;According to coupling contact force, construct balance equation, and calculate the acceleration on each background grid node in material point method, and the acceleration and angular acceleration on each discrete unit;According to the acceleration on background grid node, the acceleration of discrete unit and the angular acceleration of discrete unit, the real-time speed and displacement of material point and discrete unit are calculated.

The application discloses a rock damage and failure smooth molecular dynamics analysis method. The application combines particle failure with rock numerical damage simulation to construct a new rock damage numerical simulation mode. The particle discrete principle of the material point method is used to discretize the calculation material domain. The calculation domain is discretized into particles by using software such as ANSYS. The particles in the calculation domain are endowed with certain material properties. The Mohr-Coulomb criterion commonly used in rock mechanics is used as the failure criterion. When the material reaches the failure condition, the particles are subjected to failure treatment. The failed particles will be permanently failed. The method is simple and easy to implement. The high efficiency and stability of GIMP itself are utilized. The gradual damage and failure process of the rock is simulated by the failure process of the particles. The whole process of the rock damage and failure can be obtained. The research provides a certain reference for the understanding of the smooth particle dynamics method in rock damage numerical simulation.

The invention discloses a seismic landslide large deformation analysis method considering spatial variability, and belongs to the technical field of geotechnical engineering large deformation problem numerical simulation. The method comprises the following steps: firstly, constructing a material point analysis model with spatial variability based on a geometric model of a landslide area and random field statistical characteristics of mechanical parameters of a soil body; secondly, carrying out static analysis on the landslide mass under the action of a self-weight load to obtain a static balance stress field of each material point; and finally, taking the static balance stress field as an initial stress field, carrying out dynamic analysis under the action of self weight and earthquake load to obtain a landslide mass deformation result, and completing earthquake landslide large deformation analysis considering spatial variability. On the basis of a material point method, the spatial variability of soil body parameters is represented based on a random field theory, accurate simulation of the seismic load is realized by combining a two-stage solving strategy, the landslide evolution process of the soil body with the spatial variability under the action of an earthquake is reasonably described, and the seismic load simulation accuracy is improved. And an effective technical support is provided for research on the problem of large deformation of the soil body considering spatial variability.

The invention discloses a shale gas fracturing design optimization method based on geological characteristic differences around a well. The shale gas fracturing design optimization method comprises the steps that shale quality factor parameters and compressible factor parameters are constructed, and the difficulty degree of a fracturing section in a shaft is primarily judged; based on a crustal stress field material point method fracturing simulation technology, asymmetric semi-fracture lengths of left and right wings under a preset fracture height condition are obtained, and a key transformation section on a plane is determined; three-dimensional modeling is used for determining the horizontal well space fracturing difficulty degree and fracturing segments; determining main parameters of yield control by adopting a deep learning convolutional neural network method; in a known well, main parameters of yield control and the liquid amount and the sand amount of each test section are used as learning samples to predict the use amount of fracturing materials of each section of the horizontal well; and in combination with productivity prediction and economic evaluation results, one-section-one-strategy fracturing design optimization is carried out on the sections with different fracturing difficulty levels, so that the transformation efficiency is effectively improved, and the shale gas yield is improved.

This invention discloses a digital prediction method and system for geological disaster risks, belonging to the field of geological disaster monitoring and prediction technology. The method includes: acquiring multi-source survey and mapping data; constructing a three-dimensional digital model based on the multi-source survey and mapping data; performing finite element simulation inversion-forward dynamic feedback analysis based on the three-dimensional digital model and monitoring data to identify potential instability areas; deducing the movement and evolution process of geological disasters based on the potential instability areas using the large deformation material point method; and completing an intelligent assessment of geological disaster risks based on the movement and evolution process of geological disasters. This invention achieves unified integration and visualization of multi-source data, improves the accuracy and timeliness of geological disaster prediction, and provides scientific and reliable decision support for geological disaster prevention and control.

The application discloses a kind of simulation numerical method of latent erosion based on semi-implicit two-phase material point method, and relates to geotechnical engineering numerical simulation technical field, which comprises: based on mixed physics, non-saturated easy latent erosion accumulation soil is generalized as two-phase multi-component medium;Establish solid-liquid two-phase double-layer grid system;Establish the core control equation of internal seepage latent erosion of soil;The material point information of solid phase and liquid phase is transmitted to the corresponding background grid node in double-layer grid system;Boundary conditions are applied on the background grid of double-layer grid system, and the core control equation is semi-implicitly solved;The node velocity obtained is mapped to material point;Judge whether the relative velocity of solid phase and liquid phase exceeds seepage velocity threshold value;Update two-phase material point carrying state variable information;Correct permeability and saturation;Judge whether the calculation reaches specified time or whether soil reaches yield limit.The present application has important theoretical and engineering practical value for solving the simulation problem of accumulation soil latent erosion disaster.

The invention discloses a multi-physical process simulation method for laser processing of a fiber composite material based on a material point method. The method comprises the following steps: firstly, acquiring simulation parameters of material geometric information, laser information, material thermodynamic information and a processing mode required in a simulation process; establishing a grid and particle model of the fiber composite material according to geometric structures of fibers and a substrate of the fiber composite material and material geometric information parameters; secondly, setting initial conditions and boundary conditions of grids and particle models of the fiber composite material processed by the laser; establishing a laser space energy distribution model; establishing a heat transfer phase change equation of the material under the action of laser; establishing thermal stress response of the material under the action of laser; finally, time stepping is calculated, speed, position, deformation and temperature information on material particles and grids is updated, and laser energy spatial distribution is corrected according to spatial distribution of particle splashing; according to the invention, accurate multi-physics field coupling is realized.

The present application belongs to the technical field of three-dimensional geological modeling, in particular relates to a kind of GIS-MPM seamless integration dynamic three-dimensional geological model construction method, this method based on GIS platform secondary development seamlessly integrates GIS with MPM (material point method), utilizes GIS to carry out three-dimensional modeling and three-dimensional visualization, utilizes MPM to carry out geotechnical mass large deformation numerical calculation, simultaneously, it is combined with the mutual conversion technology between elevation grid data model and material point model, and the adaptive technology of material point and background grid, constructs the dynamic three-dimensional geological model that can carry out quantitative display.This method makes up the deficiency in traditional static modeling method, provides effective way for improving three-dimensional geological model quantitative calculation analysis and dynamic simulation display capability, makes three-dimensional geological model truly have "vitality", therefore have certain practical significance and application value.

A method for analyzing the overtopping failure of earth-rock dams based on the material point method belongs to the field of numerical simulation technology in civil engineering and hydraulics. The steps are as follows: S1, read in the material point information for each zone, background mesh information, material constitutive models and parameters of the material points, load information of the material points, and related calculation parameters; S2, based on the material point adaptive mapping technique, update the position and momentum of the material points in each time step; S3, calculate the equivalent plastic strain of the material points, consider the fluid-solid transformation of the material points in the dam area through the strength reduction method, and update the stress of the material points according to the constitutive models of the material points in each zone; S4, repeat S2 and S3 until all time steps are completed, and output the deformation and reservoir water level changes at typical moments during the overtopping failure process of the earth-rock dam. This invention uses adaptive mapping to improve the computational efficiency of large-scale problems, effectively reflects the scouring effect of reservoir water on the dam slope during the overtopping process, and reasonably reproduces the evolution process of the overtopping failure of earth-rock dams.

The application discloses a kind of earth-rock dam overtopping breaching analysis method based on material point method, belong to civil and water conservancy numerical simulation technical field.The steps are:S1, read each partition material point information, background grid information, material constitutive model and parameter of material point, load information and relevant calculation parameters of material point;S2, based on material point adaptive mapping technology, in each time step, update material point position, momentum;S3, the equivalent plastic strain of material point is calculated, the fluid-structure conversion of dam body area material point is considered by strength reduction method, and the stress of material point is updated according to the constitutive model of each partition material point;S4, cycle S2 and S3 until the calculation of all time steps is completed, and the deformation condition and reservoir water level elevation change result in the overtopping breaching process of earth-rock dam are output.The application uses adaptive mapping to improve the calculation efficiency of large-scale problem, effectively reflects the scouring effect of reservoir water on dam slope in overtopping process, and reasonably reproduces the evolution process of earth-rock dam overtopping breaching.

The application discloses a surface-embedded material point method for a multi-body contact problem, and belongs to the technical field of computational mechanics and numerical simulation. In a first step, a physical model of a multi-body contact system is discretized and parameters are set. In a second step, contact forces are calculated. In a third step, physical quantities of material points of contact bodies are transferred to background grid nodes to obtain node mass, momentum and force. In a fourth step, a grid is updated. In a fifth step, velocities, displacements, stresses and densities of the material points are updated. In a sixth step, background grid physical quantities are reset. In a seventh step, the first, fourth, fifth and sixth steps are repeated to update physical quantities of material points of other contact bodies and to allocate corresponding contact body background grid nodes in a memory. In an eighth step, after all contact bodies are updated, a current time is updated to obtain a dynamic simulation result. The application can accurately represent object boundaries, effectively simulate complex problems such as impact and multi-body contact, and has good stability and low memory consumption.