664 results about "Elastic plastic" patented technology

The invention belongs to the technical field of oil and gas production and development, and discloses a sand production pressure difference and sand production quantity quantitative prediction method suitable for a high-temperature and high-pressure sandstone reservoir, which comprises the following steps: calculating static rock mechanical parameters of a target well; predicting initial crustal stress; establishing a porosity and permeability dynamic evolution model; establishing a three-dimensional finite element model; establishing a seepage stress coupling transient nonlinear finite element equation; applying well bottom pressure drop to simulate production, and determining sand production pressure difference; and establishing a sand production rate prediction model, and quantitatively predicting the sand production rate. According to the method, factors such as pore permeability stress, temperature change and water content influencing rock strength are comprehensively considered, a three-dimensional finite element model is established, a seepage stress coupling finite element equation and solving steps are established based on a reservoir elastic-plastic consolidation theory, critical plastic strain is introduced to quantitatively characterize the sand production risk, a sand production prediction model is established, and the rock strength is predicted. And finally, quantitative and accurate calculation and scientific pressure control of the critical sand production pressure difference and the sand production amount are realized.

The invention provides a macroscopic finite element simulation analysis method and device for a sealing element considering plastic deformation, and belongs to the field of sealing element design. The method comprises the following steps: acquiring an engineering stress-strain curve of a plastic material in a compression state; converting the engineering stress-strain curve into a real stress-strain curve; determining a yield limit, and taking a strain point corresponding to the yield limit as a demarcation point of elasticity and plastic deformation; an elastic section of a real stress-strain curve is extracted, the elastic modulus is calculated, and the Poisson's ratio is obtained through axial and transverse strain measurement in a uniaxial compression test; a true stress-strain curve plastic section is extracted, and a multi-linear isotropic hardening model is established; constructing a complete elastic-plastic constitutive model covering the elastic deformation area and the plastic deformation area; the stress distribution, the strain response and the contact performance of the plastic sealing element in a compression deformation state are simulated. According to the method and the device provided by the invention, the problem that the result does not conform to the reality due to the fact that only elastic modulus and Poisson's ratio are used in existing sealing element simulation can be solved.

The invention discloses an electric arc additive manufacturing temperature field and stress field real-time reconstruction method, which comprises the following steps of: 1, constructing a sequential coupling finite element model in which heat conduction analysis and thermoelastic-plastic mechanical analysis are combined on the basis of process parameters of an electric arc additive manufacturing process and three-dimensional geometry of parts, generating a multi-physical field coupling data set among heat flux density, temperature and stress; step 2, constructing and training a neural network model based on a multi-physics field coupling data set, and realizing mapping from heat flux density to temperature and stress; 3, dynamically optimizing heat source model parameters in combination with real-time monitoring data and process parameters in the electric arc additive manufacturing process; and 4, based on the optimized heat source model parameters and the trained neural network model, real-time reconstruction of a temperature field and a stress field in the electric arc additive manufacturing process is achieved. According to the invention, the requirements of rapid sensing and intelligent regulation and control of temperature and stress states on an additive manufacturing site are met.

The invention discloses a cross-scale rock elastic mechanical parameter measurement method and system, and relates to the technical field of rock measurement, and the method comprises the following steps: obtaining nano-scale rock elastic mechanical parameters and micro elastic-plastic deformation of rock through a nanoindentation experiment, so as to construct a molecular dynamics model of the rock; according to the molecular dynamics model of the rock, using an inclusion homogenization theory to upgrade the rock elastic mechanics parameters of the nanoscale to the rock elastic mechanics parameters of the centimeter scale, so as to construct a rock elastic mechanics parameter conversion model, and using environmental data in an in-situ environment for correction; and inputting the nano-scale rock elastic mechanical parameters into the corrected rock elastic mechanical parameter conversion model to obtain centimeter-scale rock elastic mechanical parameters. According to the invention, centimeter-scale rock elastic mechanical parameters in a deep stratum in-situ environment can be accurately measured.

The invention relates to the field of sealing testing, in particular to a sealing performance analysis method based on elastic-plastic contact calculation of finite element-boundary element coupling, which comprises the following steps: establishing a finite element model of a sealing structure, and obtaining contact pressure distribution of a sealing contact interface; dividing the sealed contact interface into a plurality of fan-shaped areas, and processing each fan-shaped area into a rectangular area; generating a rough surface of which the surface height value has a specified statistical distribution rule for each rectangular region, performing equivalent contact simplification for the rough surface in the sealing contact process, and solving the microscopic contact state of the rough surface; and constructing a contact state matrix based on the microscopic contact state, and determining a leakage channel by using the contact state matrix. The problems that a traditional rough surface microcosmic contact finite element simulation method is low in calculation efficiency and elastic-plastic contact deformation convergence is difficult are solved, and the efficiency of microcosmic contact calculation and sealing performance analysis is greatly improved.

The invention relates to the technical field of geomechanical simulation of tunnel engineering, in particular to a tunnel surrounding rock water immersion weakening fluid-solid coupling simulation method and system.The method comprises the steps that mechanical parameters and seepage parameters of typical tunnel surrounding rock materials are obtained, and then an evolution equation of water immersion equivalent strain along with time is constructed; constructing a water immersion equivalent strain-seepage parameter dynamic correlation model based on the evolution equation and the seepage parameters; a seepage-stress coupling elastic-plastic damage constitutive model is constructed on the basis of a water immersion equivalent strain dynamic evolution model, and coupling circulation of a seepage-stress-damage field under the influence of water immersion degradation is represented on the basis of the seepage-stress coupling elastic-plastic damage constitutive model. The technical blank that bidirectional strong coupling of a seepage field and a mechanical field under water immersion response cannot be realized in the prior art is filled, and a high-precision simulation technical scheme is provided for stability analysis of tunnel surrounding rock in a water-rich environment.

The invention discloses a landslide construction simulation method based on finite elements, particularly relates to the field of construction simulation, and realizes whole-process dynamic simulation through GTS-NX software. Firstly, a three-dimensional finite element model is established based on geological exploration data, a Mohr-Coulomb elastic-plastic constitutive model is adopted, and the bulk modulus and the shear modulus are calculated through the elastic modulus and the Poisson's ratio. The initial ground stress is simulated by adopting a self-weight stress field method, and the initial displacement influence is eliminated by adopting a displacement difference method. In construction process simulation, the unit passivation / activation technology is adopted to accurately reproduce the excavation and support time sequence, and cyclic calculation of excavation-stress release-support-balance is achieved. In nonlinear analysis, superposition of an elastic stress field and a plastic stress field is considered, and an unloading influence factor is introduced to correct anisotropy of a deformation modulus. A safety coefficient is calculated through a strength reduction method, a multi-working-condition evaluation system is established, a monitoring data fusion and parameter inversion mechanism is developed, and a three-level early warning system is formed.

The invention discloses a fluid-solid coupling analysis method, system and model for cross-scale evolution of an ocean structure. The method comprises the following steps: establishing a numerical wave water tank; establishing a plurality of reinforcement layer material RVE models, obtaining a macroscopic mechanical property curve of the reinforcement layer material, and obtaining a corresponding stress-strain constitutive relationship; based on the stress-strain constitutive relation, a reinforcing layer component model of the laminated structure is established, a light deformable layer component model of the laminated structure is established, and the reinforcing layer component model and the light deformable layer component model are assembled to obtain an overall laminated floating structure; and S100, merging the laminated floating structure into the numerical wave water tank in the step S100, carrying out fluid-solid coupling numerical simulation under the action of waves, judging the working condition of plastic deformation of the floating structure according to a result, and obtaining a plastic damage area and an elastic-plastic evolution response of the laminated floating structure. According to the method, the water elastic-plastic response of the large floating structure under the action of waves can be solved and optimized.

The invention relates to the technical field of computer-aided engineering, in particular to a nonlinear efficient iterative solving method for thermal strain load, which is used for solving an obtained finite element equation by using a modified Newton-Raphson method and comprises the following steps of: firstly, establishing a geometric model to be analyzed and performing grid division; the method comprises the following steps: firstly, setting a model to be analyzed, then setting boundary conditions and temperature field change conditions of the model to be analyzed, finally, inputting the conditions into an algorithm solver, solving a nonlinear equation set, iteratively inputting a load continuously according to a modified Newton-Raphson method in the solving process, calculating node displacement until convergence, and solving stress-strain conditions in the welding process according to a material constitutive relation. In the solving process, by judging the size of the two norms of the displacement increment obtained in the adjacent increment step heuristic stage, the convergence of nonlinear solving of the structure is enhanced through the calculation mode, and the solving speed of the nonlinear problem in the thermal elastic-plastic constitutive structure is increased.

The invention discloses a method and a device for determining creep damage of a high-temperature part coupled with fatigue damage, a medium and a product, and relates to the field of high-temperature part safety assessment, the method comprises the following steps: constructing a cyclic elastic-plastic constitutive model; building a high-temperature part finite element model; the cyclic stress-strain and fatigue process of the high-temperature part under the service cyclic load is simulated; calculating the fatigue damage of the high-temperature part under the cyclic load spectrum; through fatigue damage and creep damage, the initial ratchet deformation serves as initial deformation of the creep damage stage of the high-temperature component, a service temperature field and a service load of the creep damage stage are applied to the high-temperature component, and elasticoplastic deformation and creep deformation of the component in the creep damage stage are obtained; and constructing a failure criterion and judging whether a failure occurs or not. According to the method, the creep-related structural integrity of the high-temperature part subjected to fatigue damage can be analyzed, and creep failure of the high-temperature part is prevented.

The invention belongs to the field of material testing, and discloses a method and a system for testing a hydrogen-induced cracking threshold value based on a notched round rod tensile sample, the testing method comprises the following steps: in a hydrogen environment and an inert gas environment, respectively carrying out a slow strain rate tensile test on the notched round rod tensile sample to obtain test data and two elongation rates; the hydrogen embrittlement sensitivity index of the material is obtained through the two elongation rates; acquiring elastic-plastic parameters by using the hydrogen embrittlement sensitivity index of the material and test data; when the elastic-plastic parameter is greater than 3.5, acquiring a hydrogen induced cracking threshold value by adopting an elastic-plastic crack propagation mechanism; and when the elastic-plastic parameter is not greater than 3.5, a hydrogen induced cracking threshold value is obtained by adopting a linear elastic crack propagation mechanism. The test method is short in period, high in efficiency and high in universality.

To provide a quenching simulation method for steel with high accuracy.SOLUTION: Provided is a quenching simulation method for steel, comprising: a calculation section 1 calculating a distribution of temperatures by a heat conduction analysis using a finite element method after inputting each of steel phases and physical properties at each of steel temperatures to separate a shape model; a calculation section 2 calculating distribution of strain or stress by an elastoplastic analysis; a calculation section 3 calculating distribution of phase fraction through calculation of a basic equation representing phase transformation; and a calculation section 4 calculating distribution of cooling speed from time change of temperature of each of elements, the method comprising a step of carrying out coupled analysis using phase transformation parameters of the steel calculated from the cooling speed calculated with the calculation section 4 on a procedure to calculate the phase fraction in the calculation section 3.SELECTED DRAWING: Figure 1

The invention relates to the technical field of structural design and strength evaluation of nuclear fusion devices, and discloses an elastic-plastic analysis and strength verification method, device and equipment under multiple working conditions and a medium. Firstly, basic parameters, unit partitions and conditional constraints of a target structure are obtained; next, based on basic parameters, unit partitions and conditional constraints, static nonlinear solution is carried out, a target data set and a load-displacement curve are obtained, different stress stages are abstracted into a continuous gravity loading path, the strength and deformation of multiple working conditions are synchronously evaluated through a set of elastic-plastic analysis process, and the dynamic performance of the gravity loading path is improved. The method is not limited to linear elasticity checking calculation of a single working condition any more, and the actual stress state of the structure is reflected more truly. Then, an allowable gravity amplification factor is determined based on the load-displacement curve. Further, a safety strength elastoplasticity result and a high-risk region are determined based on an allowable gravity amplification coefficient, a target data set, and a load-displacement curve. And finally, based on the high-risk area and a preset reinforcement rule, obtaining a reinforcement scheme.

The invention provides a concrete elastic-plastic damage constitutive model construction method and system, belongs to the field of computers, and solves the problems that in the prior art, an integral or gradient enhanced regularization method is adopted to establish a non-local constitutive model, but the two methods require relatively fine finite element grid division, and numerical value implementation is very difficult. Comprising the following steps: 1, determining a damage variable, nominal stress, effective stress and an elastic-plastic damage stress-strain relationship, and decomposing the effective stress according to tension and compression characteristics; 2, in the effective stress space, a concrete elastic-plastic damage constitutive model is established; and step 3, based on an energy regularization method, determining a tensile damage variable, a compression damage variable and a corresponding stress-strain relationship, and in combination with a plastic loading and unloading rule, constructing a concrete elastic-plastic damage constitutive model based on energy regularization. The invention provides the construction method of the PC box girder concrete elastic-plastic damage constitutive model under the non-uniform constraint, and the application range is wide.

The invention discloses a semi-analytical method for mechanical response analysis of an underground compressed air energy storage circular cavity, and belongs to the field of underground compressed air energy storage. According to the method, the thought of the finite difference method is adopted, the plastic zone radius and stress distribution of the lining-surrounding rock composite structure can be accurately given, and theoretical support is provided for design of the underground compressed air energy storage circular cavern. According to the method, a semi-analytic solution result is consistent with an elastic analytic solution result in a material elastic stage; the elastic-plastic state semi-analytical solution result considers that the principal stress of the material in the plastic state is always on the yield surface, so that the elastic-plastic state semi-analytical solution result is more accurate than the calculation result of the elastic analytical solution.

The invention relates to the technical field of simulation, and particularly discloses a finite element simulation method for a steel-concrete mixed structure, and the method comprises the steps: building a finite element model; selecting material parameters and defining a constitutive model; dividing a finite element grid; setting load and boundary conditions; taking the optimized material constitutive parameters as material definition parameters of a formal finite element model; evaluating the critical bearing capacity and ductility performance of the structure; and extracting a displacement field, stress distribution and a load-displacement curve of the structure, and identifying typical mechanical response characteristics of the hybrid structure in elastic, elastoplastic and descending stages. By optimizing constitutive model parameters, high-precision finite element simulation of the whole process from elasticity to damage of the steel-concrete mixed structure is achieved.

The invention discloses an integrated fan pneumatic-hydrodynamic-servo-elastic-plastic coupling analysis system and method, and belongs to the technical field of offshore fan numerical simulation calculation. According to the method, a coupling model of an offshore wind turbine under the environment load effect is established, a rotor cabin assembly is simulated through a multi-body dynamics method, and interaction of a supporting structure and pile soil is simulated through a finite element method. By introducing a prediction correction loose coupling algorithm, joint simulation between a multi-body system and a finite element system is realized. The method is not only suitable for coupling dynamic response analysis of the offshore wind turbine under the action of conventional wind wave load, but also suitable for elastic-plastic coupling analysis of the offshore wind turbine under the action of extreme typhoon load or earthquake load. In addition, the method not only can be used for coupling analysis of the offshore wind turbine of a traditional steel supporting structure, but also is suitable for integrated coupling analysis of the wind turbine of a novel steel-concrete structure on land or on the sea.

The invention discloses a finite element simulation method for evaluating the reliability of a battery structure, a product and a storage medium. The method comprises the following steps: constructing a battery finite element model comprising a shell and a sealing structure; defining elastoplastic material properties for the shell; applying a pressure load for simulating internal gas production and / or a mechanical load for simulating external impact; after solving, extracting a plastic strain result of the sealing structure area; and evaluating the integrity of the sealing function based on the result. According to the method, the elastic-plastic model is adopted, the limitation that a calculation result is distorted after a material is yielded in traditional linear simulation is overcome, and the plastic failure risk can be accurately predicted; meanwhile, a sealing function failure criterion based on plastic strain is innovatively established, and the problem that sealing performance evaluation of key connection structures such as riveting cannot be achieved is solved. According to the method, a systematic and quantitative safety boundary defining tool is provided for the battery structure design, and the reliability and efficiency of the design are remarkably improved.

The invention relates to a partition loading drilling gas extraction dynamic simulation experiment device and method, and belongs to the field of coal mine safety. The device comprises an experiment cylinder body, a loading device and an air supply device. A hole sealing section confining pressure pressurizing device, an extraction section confining pressure pressurizing device and an axial pressurizing device are arranged in the experiment cylinder body, and the influence of coal body elasticoplastic deformation on permeability is truly reflected by accurately distinguishing stress loading of a hole sealing section and stress loading of an extraction section; the method comprises the following steps: analyzing a stress state, formulating an experimental scheme, preparing an experimental sample, simulating a loading experiment and analyzing experimental data. By combining drilling construction simulation and negative pressure extraction testing, gas emission rules and leakage characteristics under different hole sealing materials, processes and extraction parameters are systematically analyzed. The technology can accurately test the gas emission rule and the air leakage characteristic of drill holes with different hole sealing processes and hole sealing parameters under negative pressure extraction, and provides a scientific basis for optimizing the gas extraction process and improving the extraction efficiency.

The invention provides an elastic-plastic unified description method and system for nonlinear characteristics of surrounding rock considering medium-principal stress, and belongs to the technical field of computer aided design. The method comprises the following steps: carrying out a true triaxial mechanical property test on surrounding rock to obtain a surrounding rock total stress-strain curve, extracting characteristic stress points of the stress-strain curve, and carrying out stage division on the stress-strain curve; constructing a characteristic yield surface in the stress space based on the characteristic stress points; based on the staged characteristics of the stress-strain curve, plastic deformation capacity characterization functions of different stages are constructed respectively, and the plastic deformation capacity characterization functions are used for describing the plastic deformation capacity of the stress-strain curve; and constructing a nonlinear hardening-softening equation to describe evolution characteristics of the characteristic yield surface. According to the scheme, the nonlinear characteristics of the stress-strain curve can be more comprehensively and accurately described under different minimum principal stresses and medium principal stresses.

A rock mass cavern seismic dynamic stability analysis method considering layer vibration degradation comprises the following steps: determining transverse isotropic elastic mechanical behaviors, strength criteria and plastic potential functions of a layered rock mass, and constructing an elastic-plastic degradation constitutive model of the layered rock mass; determining a stratified rock mass layer surface strength parameter calculation formula under the earthquake action, determining a stratified rock mass rock mass strength parameter calculation formula, and establishing a stratified rock mass strength parameter evolution rule considering the layer surface vibration degradation effect; defining a layer damage degree index, and constructing a layered rock mass damage degree evaluation index under the earthquake action; and calculating the earthquake stability safety degree coefficient of the rock mass underground cavern, and determining the earthquake stability safety degree interval of the rock mass underground cavern. According to the method, the layer vibration degradation effect is considered, the safety evaluation result is more accurate, the application range is wide, the principle is simple, the physical significance is clear, the earthquake stability of the rock mass underground cavity is effectively analyzed, and the method has good practical engineering application prospects.

The invention discloses a fiber Bragg grating measuring instrument for internal displacement of a structure, and belongs to the technical field of geotechnical engineering, the fiber Bragg grating measuring instrument comprises an elastic rubber hose and an elastic plastic sleeve which are sleeved and attached inside and outside, the outer wall of the elastic rubber hose is circumferentially provided with a measuring optical fiber, and the measuring optical fiber extends along the axis direction of the elastic rubber hose; fiber Bragg grating strain sensors which are arranged at intervals are connected in series in the measuring optical fibers along the extension direction of the measuring optical fibers, the inner wall of the elastic plastic sleeve is circumferentially provided with accommodating grooves for embedding the measuring optical fibers, the accommodating grooves extend to the end part along the axis direction of the elastic plastic sleeve, and the number and the position of the accommodating grooves correspond to the number and the position of the measuring optical fibers. The device is simple in structure and high in automation degree, can monitor the internal displacement condition of the main body structure in real time, avoids the problem of untimely detection, and can avoid the error problem caused by the damage of the measuring optical fiber and the fiber bragg grating strain sensor in the measuring optical fiber under the protection of the elastic plastic sleeve.

The invention discloses a soft tissue constitutive parameter calibration method in a soft tissue-skeleton bird body model for bird strike simulation, and the method comprises the construction of a soft tissue-skeleton bird body finite element model and finite element reverse analysis based on flat bird strike. Dividing wing bones, leg bones and head and neck parts in the bones of the bird body into hexahedral unit grids, dividing wishbones, pecking bones, fossil protrusions and ribs into shell units, and dividing soft tissues into SPH particles; further obtaining bone elastic-plastic constitutive parameters through a static compression test, and endowing the bone units with the bone elastic-plastic constitutive parameters; an objective function is set as a mean square error between a flat plate center point pressure-time curve obtained by a real bird body impact flat plate test and corresponding curve data calculated by soft tissue-skeleton bird body impact flat plate finite element simulation, and soft tissue constitutive model parameters are inversely calibrated by adopting a genetic algorithm; and model and material parameter support is provided for bird strike simulation of a high-fidelity aircraft structure.

The invention discloses a leakage rate prediction method for a sealing interface of a metal lens gasket of ultrahigh pressure equipment, and belongs to the technical field of leakage rate prediction. The method comprises the following steps: S1, establishing a coupling damage cycle elastic-plastic constitutive model of a metal lens pad material; s2, establishing an ultrahigh-pressure sealing structure finite element model, applying a cyclic load for simulation, and fitting to obtain an attenuation rule model of the contact stress of the metal lens gasket under the cyclic load; s3, establishing a single rough peak contact deformation finite element model, correlating the model with an actual sealing structure, and fitting to obtain a relational expression between the contact stress of the metal lens pad and the microcosmic rough peak deformation under the cyclic load; s4, establishing a leakage model of the microcosmic pore structure of the sealing interface, and combining the steps S2 and S3 to obtain a leakage rate prediction model of the sealing interface; and S5, predicting the leakage rate by using the prediction model. According to the prediction method, the leakage rate of the sealing interface of the metal lens gasket under the cyclic load working condition can be accurately predicted.

The invention provides a method for calculating a flexural capacity characteristic value of a steel and UHPC (Ultra High Performance Concrete) composite structural beam. Different constitutive models are adopted according to performance characteristics of UHPC, a T-shaped steel beam and a steel bar in the composite structural beam, and the contribution of material strain hardening performance to the flexural capacity is fully considered; compared with an ideal elastic-plastic model, the real performance of the structure can be better obtained; meanwhile, the cross section curvature, the curvature iterative calculation increment and the neutral axis position iterative calculation increment are given for initial values of conventional bridge calculation, and the neutral axis position and the cross section curvature are searched by adopting an influence coefficient method, so that the search speed is increased, and the problem that convergence cannot be realized due to manual setting of the iterative increment is solved; and finally, the condition that the UHPC top strain reaches the UHPC compression limit strain or the T-shaped steel beam bottom strain reaches the steel limit strain is taken as a judgment condition, and two damage modes of UHPC crushing and the condition that the steel reaches the tensile ultimate strength can be considered at the same time.

The invention belongs to the technical field of geological research, and particularly discloses a rainfall infiltration induced loess high fill humidifying settlement prediction method which comprises the following steps: S1, acquiring mechanical property parameters of a soil body under different compaction degrees, and fitting the mechanical property parameters under different compaction degrees and different moisture contents to obtain a fitting function; s2, on the basis of an unsaturated loess fluid-solid coupling analysis principle, transforming the fitting function to obtain a soil body humidification interpolation function under different compaction degrees and different water contents; s3, through Comsol finite element software, the interpolation function is embedded into the soil elastic-plastic constitutive model, and the weakening process of soil strength parameters along with soil humidifying deformation is simulated. By the adoption of the method for predicting the rainfall infiltration induced loess high-fill humidifying settlement, the problem that a loess high-fill foundation cannot be subjected to systematic humidifying settlement prediction aiming at rainfall is solved, and safety guarantee is provided for high-fill foundation engineering.

The invention discloses a welding thermal stress simulation method, device, equipment and medium based on a crystal plasticity finite element, and relates to the technical field of welding thermal stress finite element simulation. The method comprises the steps that a sample is prepared according to a specific multi-phase metal material, and phase distribution and crystal orientation information of a two-dimensional plane of the material are obtained through a metallographic experiment; and a three-dimensional multi-grain model is constructed based on the two-dimensional information. According to the method, a crystal plastic constitutive model is adopted to describe the flowing behavior of the material at high temperature, crystal slippage and polycrystal interaction are considered, the influence on the material performance is reflected from the microstructure evolution level, and the problem that the influence on the macroscopic mechanical performance of a microstructure is difficult to capture in welding multiphase metal material simulation is solved; two-dimensional representation is obtained through a metallographic experiment, the Young modulus and rigidity matrix parameters are accurately calculated by combining forward stretching and shear simulation, the rigidity matrix precision is improved, a temperature field area is divided, stress evolution and residual stress are calculated by combining a thermal-elastic-plastic model, and the welding thermal stress calculation precision is improved.

The invention relates to the technical field of deep underground engineering, in particular to a deep underground engineering surrounding rock loose circle evolution process visualization method and related equipment. According to the technical scheme, the method comprises the steps that rock samples collected on site are scanned at different loading stages through a CT scanner, CT scanning images are obtained, meanwhile, monitoring sections and monitoring points are arranged on the deep underground engineering site, displacement, stress and strain sensors are installed, and surrounding rock information is obtained through the drilling camera shooting technology; finite element software is used for establishing a numerical model of deep underground engineering, a viscoelastic-plastic constitutive model considering rock damage and rheological characteristics is selected, model parameters are assigned according to CT scanning images and rock mechanical test results, and corrected numerical simulation data are obtained through parameter inversion correction. According to the method, reliable surrounding rock information is obtained by comprehensively applying multiple data acquisition means, and the accuracy of a numerical simulation result is improved by adopting the viscoelastic-plastic constitutive model considering rock damage and rheological characteristics.

The invention discloses a method for calculating an elastic-plastic model of a shield freezing reinforced rock-soil body, which comprises the following steps of: training a support vector machine model by constructing a sample library of the rock-soil body which takes water content and rock-soil body temperature as inputs and takes hardening parameters and softening parameters as outputs; obtaining a support vector machine expression model of hardening parameters and a support vector machine expression model of softening parameters; obtaining a stress-strain constitutive expression of the rock-soil body based on the intelligent agent model; and finally, obtaining an elastic-plastic model of the frozen soil layer of the rock-soil body comprising the intelligent agent model. And in combination with the temperature of the rock-soil body, a ground surface displacement settlement value of frozen shield construction is obtained, and calculation of the elastic-plastic model of the shield frozen reinforced rock-soil body is completed. According to the method, the elastic-plastic mechanics of the soil body is well used, the freezing process and the thawing process are combined, the state of the shield freezing reinforced rock-soil body can be well reflected, the characteristics of freezing, thawing and softening of the soil body are described, and the method has a strong guiding effect on engineering practice.

The invention belongs to the technical field of high polymer materials, and particularly relates to environment-friendly aliphatic TPU (thermoplastic polyurethane) elastic plastic. The bio-based polyurethane elastomer is prepared from the following raw materials in parts by weight: 60 to 65 parts of bio-based polyester polyol, 25 to 30 parts of aliphatic diisocyanate, 5 to 8 parts of silane coupling agent grafted nano cellulose whisker, 1.5 to 2.5 parts of chain extender, 0.5 to 1 part of bio-based organic tin catalyst, 0.3 to 0.7 part of antioxidant and the like. Compared with the prior art, the invention has the following beneficial effects: environment-friendly raw materials such as bio-based polyester polyol, bio-based organic tin catalyst and the like are adopted, and the degradable nano-cellulose whisker is used as a reinforcing agent, so that the use of petrochemical raw materials is reduced from the source, the environmental pollution is reduced, and the material is easy to degrade after being used, and is environment-friendly. The TPU elastic plastic prepared by the preparation method disclosed by the invention meets the modern environmental protection concept, and the TPU elastic plastic has excellent elasticity, wear resistance and weather resistance due to the elaborately designed raw material ratio, so that the TPU elastic plastic has wide application potential in the field of shoe materials.