36 results about "Saturated soils" patented technology

The invention discloses an airport high-fill soil rainfall seepage field analysis method and system. The method comprises the steps that first-level slope sections on the two sides of a branch ditch in a high-fill area are selected, and simplification assumption is conducted on an engineering structure of the first-level slope sections in combination with foundation investigation and design data; functional partition is carried out on the research area, and structured grid division is carried out on each functional partition through simulation software; based on an unsaturated soil water flow theory, selecting a mathematical model for describing a relationship between a soil water characteristic curve and a permeability coefficient, inputting physical and mechanical parameters of a filled soil body, setting boundary conditions of a seepage model, and completing construction of the seepage model; designing at least two typical rainfall working conditions; carrying out saturated-unsaturated seepage simulation, and recording dynamic change data of pore water pressure and a transient saturation region under different working conditions; and carrying out multi-dimensional quantitative analysis on a simulation result, and summarizing an association rule of rainfall parameters and a seepage field. And safe operation of airport engineering is ensured.

The invention discloses a saturated soil foundation reinforcement method and system based on multi-field coupling, particularly relates to the technical field of geotechnical engineering reinforcement, and is used for solving the problems of parameter mismatch, material waste and secondary deformation caused by lack of dynamic coupling analysis in an existing grouting process. The seepage pressure, the soil deformation rate and the slurry diffusion rate are obtained in real time; generating a multi-field collaboration parameter and correcting the multi-field collaboration parameter; identifying an abnormal region of seepage and deformation direction deviation; extracting a seepage gradient and a diffusion main direction to generate correction parameters; performing staged gradient grouting; dynamically optimizing the parameter gradient and interval; outputting a stable state control parameter; and through multi-field data collaborative analysis and closed-loop feedback control, dynamic matching of grouting parameters and stratum response is achieved, and the reinforcement precision and the engineering reliability are remarkably improved.

The invention discloses a saturated seepage zone and unsaturated moisture zone identification method based on an active heating optical fiber, and the method comprises the steps: carrying out the thermal response test of a to-be-tested soil body through the power supply of an AH-UWFBG optical cable, and obtaining a response curve of a temperature rise value [delta] T of the to-be-tested soil body along with time t; the AH-UWFBG optical cable is placed in the saturated soil body, and the temperature rising value delta Tsat of the saturated soil body and the time t0 when the slope of a delta T-lnt curve of the saturated soil body reaches the stable state are measured; judging a boundary line of a saturated seepage zone and an unsaturated water zone in the to-be-detected soil body by judging the slope of the delta T-lnt curve and the size relationship between delta T and delta Tsat, and calculating the water content under the condition of no seepage and the seepage speed under the condition of seepage; the invention provides a new method for monitoring the hydrological process, and more accurate and comprehensive soil moisture and seepage data can be provided for the fields of environmental science, water resource management, agricultural production and the like.

The invention provides a method for synchronously inverting unsaturated soil solute reaction parameters, and belongs to the technical field of software development. The method comprises the following steps: establishing an initial model for simulating chain reaction migration of solutes in unsaturated soil based on HYDRUS-1D software, and generating a corresponding input file; based on observation data of the one-dimensional vertical infiltration test, determining a plurality of solute reaction parameters to be synchronously inverted and an initial value range thereof; adopting a genetic algorithm to randomly generate an initial population containing multiple groups of parameter combinations in the initial value range; performing solute transport simulation on each group of parameter combination in the population, and automatically extracting a simulation result; calculating a fitness value corresponding to each parameter combination based on the observation data and the simulation result obtained in the step S4; and iteratively optimizing, and judging whether a termination condition of the genetic algorithm is met or not. By optimizing a software running program and adjusting automatic extraction and processing of calculation parameters, efficient and continuous soil solute transport analysis is realized.

This invention relates to a method for analyzing large deformations of saturated soil and structures based on a semi-implicit material point method, comprising: decoupling pore pressure and motion variables using an incremental step method; introducing a penalty function for an enhanced frictional contact algorithm; introducing an artificial compressibility parameter into the pressure Poisson equation; employing the B-bar technique to reduce volume lock-in effects; using an affine particle cell method; modifying the calculation formula for axisymmetric problems, considering volume integrals and gradient evaluation in cylindrical coordinates; and conducting verification. The beneficial effects of this invention are: by employing an incremental step method, artificial fluid compressibility, and the B-bar technique, this invention avoids numerical instability caused by coupling problems in traditional methods, ensures the convergence of the simulation process, and avoids non-physical stress oscillations.

The invention discloses an unsaturated porous medium soil heat conductivity coefficient prediction method and system based on data mechanism driving, and belongs to the technical field of geotechnical engineering thermophysical property analysis. According to the method, experimental testing, numerical simulation and an intelligent algorithm are integrated, and a research normal form of data and mechanism coupling driving is embodied. The method specifically comprises the following steps: obtaining a heat conductivity coefficient initial data set through a test means; then establishing a finite element model, verifying the reliability of the finite element model through temperature drop comparison, and generating 80 groups of working condition data through a least square finite element method; and finally, an intelligent algorithm is introduced to train a prediction model, BPNN is trained after normalization, and neurons of an input layer 3, neurons of a hidden layer 12 + 6 and neurons of an output layer 1 are included. According to the algorithm, a physical mechanism and data driving are fused, the problem that a traditional model is poor in applicability is solved, prediction precision is high, and the algorithm is suitable for civil engineering thermophysical analysis.

The utility model discloses a soil sample compacting device capable of detecting water content, which comprises a water-permeable water-collecting base, triangular bearing devices are arranged at the upper parts of four break angles on the inner side of the water-permeable water-collecting base, the bearing devices are used for placing a bottom water-permeable plate, the device comprises two L-shaped water-permeable side plates, and the two L-shaped water-permeable side plates are arranged on the two L-shaped water-permeable side plates. Vertical grooves are engraved in the middles of the inner sides of the two L-shaped water-permeable side plates, the vertical grooves clamp the position of the cross-shaped water-permeable water partition plate, a fixing groove is engraved in the lower left area of one side plate and used for fixing a water content sensor, the water content sensor is connected with a data acquisition device, the data acquisition device comprises a compaction cushion block, and the compaction cushion block is fixedly connected with the cross-shaped water-permeable water partition plate. And the upper part of the compaction cushion block is used for placing a loading weight. According to the utility model, a saturated soil body can be compacted to prepare a sample during a geotechnical test, the overall stability is improved by using a stainless steel material, four samples with the same physical indexes can be conveniently obtained due to the design of quick disassembly, and the disturbance of secondary cutting to the samples is avoided.

The application discloses a root zone soil moisture estimation method based on remote sensing driving and moisture hysteresis characteristic simulation, an electronic device and a medium. The method can comprise: acquiring remote sensing data with the same time resolution and spatial resolution, including remote sensing surface soil moisture data, remote sensing evapotranspiration data, potential evapotranspiration data, rainfall data and saturated soil humidity; calculating root zone soil humidity based on the remote sensing surface soil moisture data, and then calculating an estimated value of the evaporation ratio based on the root zone soil humidity and the saturated soil humidity; calculating the remote sensing evaporation ratio based on the remote sensing evapotranspiration data and the potential evapotranspiration data; establishing a target function to calculate an error, and when the error is less than a set threshold, outputting the root zone soil humidity. The application introduces the remote sensing evaporation ratio to exert physical constraints to embody the influence of vegetation and improve physical rationality, and constructs a multi-constraint target function optimization model parameter to improve the estimation accuracy and reliability of the remote sensing evaporation ratio.

The application provides an unwrapped DNA soil water tracer, and the composition of the tracer is as follows: 0.1-20 mu mol / L unwrapped single-stranded DNA with a length of 80-120 bp, 0.01-0.2 mol / L Tris, 0.001-0.2 mol / L EDTA, 0.2-0.8 g / L bright blue, and the pH is adjusted to 7.0-9.0 by using 5-6 mol / L NaOH or 5-6 mol / L HCl solution. The recovery rate experiment of penetrating a saturated soil column shows that, compared with the existing DNA tracer, the unwrapped DNA soil water tracer has the advantages of not being easy to decompose, not being easy to adsorb and having a higher penetration rate in real soil.

The invention provides an efficient MFM-FEM-SBFEM saturated soil deformation analysis method, and belongs to the technical field of numerical simulation of civil and hydraulic engineering. The method comprises the steps that S1, an FEM model is established based on the actual engineering size, FEM node information, FEM unit information, material constitutive model parameters and load information are read in, and FEM small deformation analysis is carried out; s2, determining a potential large deformation area, and replacing an FEM unit with an MFM node in the potential large deformation area; s3, realizing cross-size connection between the replaced FEM unit in the step S2.2 and the encrypted MFM node by adopting an SBFEM unit; s4, correlation matrixes in the FEM area, the MFM area and the SBFEM area are calculated respectively and assembled into an overall matrix to be solved, and MFM-FEM-SBFEM saturated soil deformation analysis is completed. According to the method, coupling of the three algorithms on the matrix level is achieved based on the thought of common nodes, the advantages of the FEM in calculation efficiency, the SBFEM in cross-size and the MFM in large deformation are synergistically exerted, and the method has great significance in simulation of complex mechanical behaviors of saturated soil in actual engineering.

The utility model relates to a novel saturated soil body visual subsurface erosion test device which comprises a flat box body, and a box cover is detachably arranged at the top of the flat box body; a water inlet is formed in the top of the box cover and communicates with a communicating cavity in the box cover, and the communicating cavity is connected with a nozzle at the bottom of the box cover; a partition plate is fixed to the lower portion of the interior of the flat box through a step, a plurality of leakage holes are formed in the partition plate, a monitoring unit is installed on the partition plate between every two adjacent leakage holes, an upstream pipe is installed on the portion, on one side face of the flat box, of the bottom flow channel, a downstream pipe is installed on the opposite side face of the flat box, and stop valves are installed on the upstream pipe and the downstream pipe correspondingly. And a pumping device is mounted on the upstream pipe. According to the utility model, the section structure of the saturated soil body under the subsurface erosion effect can be displayed, so that direct observation from the outside is facilitated. According to the utility model, the activity influence of underground water is fully considered, so that the subsurface erosion process can be simulated more truly, and reliable data support can be provided for subsequent working conditions.

The application provides a high-recovery unwrapped DNA soil water tracer, and the composition of the tracer is as follows: 0.1-20 micromoles per liter of single-stranded DNA with a length of 80-120 base pairs, 0.01-0.2 moles per liter of Tris, 0.001-0.2 moles per liter of EDTA, 0.3-1 moles per liter of sodium monohydrogen phosphate or 0.05-0.1 moles per liter of sodium hexametaphosphate solution, 0.2-0.8 grams per liter of brilliant blue, and the pH is adjusted to 7.0-9.0 by using 5-6 moles per liter of NaOH or 5-6 moles per liter of HCl. The recovery rate experiment of the penetration of a saturated soil column shows that, compared with the existing DNA tracer, the unwrapped DNA soil water tracer has the advantages of not being easy to decompose, not being easy to adsorb and having a higher penetration rate in real soil.

The invention is suitable for the technical field of geological engineering, and provides a power transmission facility area mountain slope infiltration law assessment method and system, and the method comprises the steps: obtaining and preprocessing multi-source geographic data, and screening a typical slope surface in an adjacent area of a power transmission line through the superposition analysis of a geographic information system; extracting soil hydraulic characteristic parameters of the corresponding slope from a soil database or field measurement data; constructing a vertical one-dimensional unsaturated soil moisture migration numerical model, and setting simulation depth, grids and atmospheric boundary scenes of two different runoff generation conditions; the model is operated, soil moisture migration related data under the atmosphere boundary scene of two different runoff generation conditions are compared, and the influence of surface runoff on the infiltration process is quantitatively evaluated; the comparative analysis result is applied to a power transmission line crossing area, and a slope infiltration response sensitive area is identified; and quantitative data basis can be provided for landslide early warning and electric tower foundation site selection.

The invention provides a soil moisture storage capacity determination method, device and equipment, and relates to the technical field of soil moisture storage capacity determination, the method comprises the following steps: obtaining a first weight, a second weight and a third weight; the first weight is the weight of the volume weight ring and the soil column in the volume weight ring; the second weight is the weight of the volume-weight ring and the soaked soil column; the third weight is the weight of the volume-weight ring and the soaked soil column after being placed on the coarse sand for the target duration; according to the first weight, the second weight and the third weight, the saturated soil water content of the soaked soil column and the unsaturated soil water content after the soaked soil column is placed on the coarse sand for the target duration are determined; and according to the saturated soil moisture content and the unsaturated soil moisture content, determining the soil moisture storage capacity and the soil moisture leakage rate. The method provided by the embodiment of the invention provides an effective and feasible quantitative monitoring method for water storage, replacement and leakage release processes of soil with different backgrounds.

The invention provides a fine testing device for seepage shear strength and application. The device comprises a main body frame, a shearing unit, a loading unit, a seepage unit and a propelling unit, and the shearing unit, the seepage unit and the propelling unit are arranged in the main body frame. The weakening effect of water seepage on the shear strength of the rock-soil body in the shear process of the saturated soil sample can be considered, and fine testing is carried out; the seepage strength can be freely adjusted, the test of the seepage shear strength of the rock-soil body under any complex seepage conditions such as strong seepage or weak seepage is realized, and the technical problem that the seepage shear strength of the rock-soil body under the complex seepage conditions cannot be accurately tested in the prior art is solved; according to the method, the real effective stress on the shearing surfaces at different positions in the shearing process is considered, and the seepage shear strength of the rock-soil body is accurately solved by combining an analytical calculation equation, so that the organic combination of test and theoretical calculation is realized, and the test of the seepage shear strength of the rock-soil body has dual innovation of theory and technology.

The present application provides a method for calculating slope hydrological processes, which belongs to the field of hydrological numerical simulation calculations. The method includes: receiving basic data of the target area; setting the upstream and downstream connection relationship of the slope cells; calculating the moisture interaction process between the vegetation layer, surface layer, unsaturated soil layer and saturated soil layer of each slope cell; calculating the top water storage of the slope cell and the overflow process between cells; correcting the model parameters according to the soil moisture monitoring data to obtain the final time series of the slope soil moisture. The slope hydrological process calculation method proposed in this application can effectively overcome the expression limitations of the traditional surface water-groundwater model when simulating the special green space construction of slope cells, while supporting the calculation of slope hydrological processes with high spatial resolution and high temporal resolution, significantly improving the accuracy and efficiency of the calculation results.

The invention provides an embedded three-dimensional soil pressure testing device and a testing method thereof, and belongs to the technical field of geotechnical engineering test.The embedded three-dimensional soil pressure testing device is characterized in that an open hole is formed in the center of a pressed top panel so as to facilitate drainage after testing; the pressed edge panel is in contact with a lateral test soil body to transmit stress; a power supply element and a storage element are arranged in the inner cylinder, and stable power supply exists between the inner cylinder and each thin film pressure sensor; the bottom plate and the inner cylinder are connected to form a stable device inner frame, and meanwhile a plug hole and a plug head are arranged in the center and used for connecting the device with the outside. The water-permeable flexible films are arranged among the pressure-bearing panels, and water in the soil body can freely enter the cavity through the water-permeable flexible films. The real three-dimensional stress state of the soil body can be mastered in real time by being buried in a specific position of the soil body, and the influence of pore water pressure can be counteracted when the device is applied to the saturated soil body.

The invention provides a soil column device for simulating unsaturated soil solute transport, which comprises a soil column assembly, the soil column assembly comprises a soil column cylinder, and the first end of the soil column cylinder is detachably connected with a soil collection head or a water collection part; the soil collection head is used for collecting soil in a sampling stage of a soil column experiment, and the water collection part is used for collecting percolate in a rainfall simulation stage of the soil column experiment; the two ends of the soil column cylinder are open, a protrusion is arranged at the first end of the soil column cylinder, and external threads are arranged on the outer side of the protrusion. During sampling, the soil column cylinder and the soil collecting head are assembled, and the soil collecting head is used for cutting a soil body to obtain an undisturbed soil column. When rainfall is simulated, the soil collecting head is detached, the water collecting part and the soil column casing are assembled, and the percolate is collected through the water collecting part. After sampling, the soil column cylinder can be directly used for a migration research experiment by replacing the soil collecting head with the water collecting part, and a soil sample does not need to be taken out and refilled into a soil column, so that the integrity of the soil is ensured, and the soil sample is ensured not to be disturbed.

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 non-saturated soil permeability coefficient fast dynamic determination method and system, the method includes the following steps: the resistivity data of target area soil, dielectric constant data and temperature data are collected;These data are collected according to uniform time resolution, and observation data are obtained;Based on the data collected, construct soil heterogeneous unit feature vector;The soil heterogeneous unit feature vector is divided, and the initial permeability coefficient field is generated;Rock physics constitutive model is constructed;Fusion observation data and hydrological dynamics model and joint rock physics constitutive model, dynamically update permeability coefficient field, and apply physical constraint to optimize;Finally, output the spatial and temporal distribution of updated permeability coefficient and the uncertainty quantification result;The application can monitor the change of water in non-saturated soil in real time, accurately assess the water distribution of soil and can find the geological disaster risk such as soil seepage, landslide in advance.

This invention discloses a sponge city drainage pipeline management method based on ecological infiltration and coordinated intelligent diversion, belonging to the field of intelligent and water conservancy synergy technology. This method acquires dynamic data of the entire sponge city drainage network, performs feature fusion and extraction on the data through an ecological network collaborative analytical model, obtains a multi-dimensional collaborative parameter set, inputs this multi-dimensional collaborative parameter set into a dynamic diversion decision model, and combines it with a preset runoff control target threshold to generate network diversion control commands and ecological infiltration facility control commands, achieving coordinated dynamic management and control of network runoff and ecological infiltration. This invention uses an analytical model that couples unsaturated soil seepage theory with the hydraulic laws of the network, extracts multi-dimensional collaborative parameters using an attention mechanism, and then generates precise commands through multi-objective optimization and a condition-adaptive decision model. This enables the linkage of multiple actuators to achieve dynamic adaptation of network ecological facilities, taking into account runoff reduction, pollution removal, and energy consumption optimization, breaking through the limitations of traditional static management.

The present application relates to a method for studying the regulation mechanism of micro-nano bubble water coupled with gamma-polyglutamic acid on soil fissures, belonging to the technical field of soil improvement. The method comprises the following steps: S1: collecting and pretreating soil samples; S2: uniformly mixing gamma-polyglutamic acid solution with soil samples; S3: layering the mixed soil into containers and compacting to a preset bulk density; S4: slowly spraying and irrigating the soil with micro-nano bubble water; S5: after the saturated soil is left to stand for a predetermined time, it is placed in a preset temperature and humidity environment for dry-wet cycle treatment; S6: coupling parameter optimization, using an improved ant colony algorithm to generate an initial solution, and introducing a carbon emission factor as heuristic information to optimize the path selection probability formula. The present application can clearly regulate the regulation law of micro-nano bubble water coupled with gamma-polyglutamic acid on soil fissures, screen the optimal coupling parameter combination with low carbon adaptability, and take into account the regulation effect, ecological environmental protection and low carbon demand, thereby providing scientific basis and technical support for soil fissure improvement.

The application provides a non-saturated soil energy pile heat-water-force multi-field coupling response calculation method, comprising the following steps: S1, determining a saturated soil energy pile load transmission algorithm; S2, determining a soil water characteristic curve model considering temperature effect; S3, calculating energy pile-non-saturated soil interface shear strength considering matrix suction contribution; S4, calculating pile end ultimate resistance considering temperature load and non-saturated condition coupling effect; S5, calculating pile surrounding soil shear modulus considering temperature load and non-saturated condition coupling effect; S6, calculating energy pile-raft contact stiffness; and S7, calculating non-saturated soil energy pile heat-water-force multi-physical field coupling response. The application aims to reveal the energy pile bearing mechanism under the comprehensive action of temperature load and non-saturated soil condition, and provide theoretical and method support for non-saturated soil energy pile analysis and design.

The application discloses a kind of coal gangue backfill field soil pollutant vertical migration and accumulation risk assessment method, the method is aimed at the migration characteristics of typical pollutants in coal gangue leachate in unsaturated soil, a kind of simplified analytical model coupling adsorption and degradation behavior is constructed.First, obtain the key data such as soil profile parameters, initial concentration of pollutants and adsorption distribution coefficient;Second, input the parameters into the analytical model, the model is based on one-dimensional convection-dispersion equation, and the geochemical behavior of pollutants is parameterized by adsorption distribution coefficient and first-order degradation coefficient, the concentration distribution of pollutants at different soil depths and time is calculated;Finally, compare the simulated concentration with the soil environmental standard limit value, divide the risk level, determine the depth range and risk appearance time of high-risk soil layer.The model mechanism is clear, the parameter requirement is clear, the calculation is simple, and the migration rule and accumulation trend of coal gangue pollutants in soil can be effectively predicted, which provides a scientific basis for soil environmental risk classification, accurate monitoring point arrangement and source control of backfill site.

The application discloses a dike leakage identification and grading method based on temperature rise characteristic value and flow velocity inversion, and comprises the following steps: arranging an active heating type optical fiber as a leakage monitoring device in the foundation soil of a certain depth of a soil dike backwater slope or outer slope foot, acquiring a temperature rise time history curve in the dike foundation soil under a certain power heating mode; calculating the temperature rise value and the soil temperature rise characteristic value after heating stabilization, comparing the temperature rise value with a critical threshold value determined by a water injection test, and realizing qualitative identification of a soil dike leakage section; when the soil temperature rise characteristic value is lower than the critical threshold value, identifying that the corresponding section is a leakage section. On this basis, a quantitative function model of temperature rise and seepage velocity is derived based on the heat transfer mechanism of saturated soil and the relationship between the thermal conductivity coefficient and the compaction degree, the seepage velocity in the abnormal section is inverted, the leakage severity is determined according to the seepage velocity of the leakage section, and the leakage intensity grading is realized. The whole process of identification from qualitative identification of the leakage section to quantitative grading of the dike leakage intensity is realized.

The application discloses an airport high fill soil rainfall seepage field analysis method and system, and the method comprises the following steps: selecting a first slope profile on both sides of a branch ditch in a high fill area, combining with foundation survey design data to simplify and assume the engineering structure; functionally partitioning the research area, and structurally meshing each functional partition through simulation software; based on the unsaturated soil water flow theory, selecting a mathematical model for describing the relationship between the soil water characteristic curve and the permeability coefficient, inputting the physical and mechanical parameters of the fill soil, setting the boundary conditions of the seepage model, and completing the construction of the seepage model; designing at least two typical rainfall working conditions; carrying out saturated-unsaturated seepage simulation, and recording the dynamic change data of the pore water pressure and the transient saturated area under different working conditions; carrying out multi-dimensional quantitative analysis on the simulation results, and summarizing the correlation law between the rainfall parameters and the seepage field. The safety operation of the airport engineering is guaranteed.

The present invention discloses a method for calculating the dynamic residual deformation of saturated soil and an implementation method thereof; it relates to the field of dynamic characteristics of geotechnical engineering, and the calculation method comprises: S1, establishing a calculation model for the dynamic residual deformation of saturated soil; S2, obtaining existing original test data; S3, processing the test data to obtain fitting data; S4, training and fitting the calculation model to obtain a trained calculation model; S5, calculating the dynamic residual deformation of saturated soil according to the calculation model; the implementation method comprises: S1, establishing a worksheet in Excel; S2, inputting the calculation model for the dynamic residual deformation of saturated soil; S3, calculating the parameters of the sample after consolidation, the axial dynamic stress and axial dynamic strain; S4. Filter the data in step S3 and output them to the data processing worksheet; S5. In the data processing worksheet, calculate the residual shear strain and residual volume strain; S6. Use the regression analysis calculation formula to calculate the model parameters and the determination coefficient R to obtain the calculation model; S7. Use the calculation model to calculate the dynamic residual deformation of saturated soil; This application first improves the original saturated soil dynamic residual deformation calculation model, and then uses a large amount of data to fit the model so that the model conforms to the data obtained from the actual experiment. The model can be used to measure the relationship between the vibration cycle of the soil and the dynamic residual deformation.

The application discloses a stratum settlement finite element analysis method, device, equipment and medium. The target stratum to be analyzed and geological survey description information are acquired, and a current geological structure finite element model is obtained through model construction and a finite element discrete method; based on the Biot consolidation theory, a fluid-solid coupling control equation set of a saturated soil body is established; current groundwater variation mode constraint conditions are obtained according to the current groundwater variation mode through a constraint condition determination method; the fluid-solid coupling control equation set is solved by using a finite element analysis method, and a settlement result corresponding to the target stratum to be analyzed is determined according to a solving result. The problems that the calculation precision is limited, the calculation complexity is high, and the boundary condition setting is difficult in the prior art are solved, the flexibility and comprehensiveness of stratum settlement analysis under different pumping working conditions are improved, the calculation complexity is reduced, the method is simple and easy to implement, and the robustness is good.

The invention discloses a method for measuring matric suction by correcting the supergravity influence of a centrifugal method, which comprises the following steps: preparing two groups of parallel saturated soil samples, respectively carrying out centrifugal test and drying shrinkage test on the soil samples under the same working condition, recording the volume deformation and moisture evaporation capacity of the soil samples in the test, a centrifugal test and a drying shrinkage test are connected by taking the mass moisture content as a bridge to obtain the volume of a soil sample under the same mass moisture content, the soil sample only has vertical shrinkage in the centrifugal test, the matrix suction of each stage is calculated by correcting the distance between the top surface of the soil sample and a central shaft of a centrifugal machine, and the matrix suction is calculated by correcting the distance between the top surface of the soil sample and the central shaft of the centrifugal machine in the drying shrinkage test process. The soil sample has vertical shrinkage and horizontal shrinkage, through volume conversion, the vertical shrinkage of the soil sample under the condition of no horizontal shrinkage is obtained, and the matrix suction of the soil sample under the dry shrinkage condition is obtained through a matrix suction calculation formula in a centrifugal method. The matric suction calculation method capable of correcting the influence of the supergravity provides a reliable measurement method for the measurement of the soil-water characteristic curve of the unsaturated soil.

The present application relates to the field of calculation, extrapolation, or counting technology, and in particular to a method for estimating regional field water holding capacity based on microwave remote sensing. The method comprises acquiring and processing target data; determining the precipitation level of saturated soil and the duration of saturated soil dewatering based on the target data information; determining the date for selecting microwave soil moisture data as the remote sensing field water holding capacity based on the precipitation data; and calculating the field water holding capacity of the remote sensing region based on the microwave soil moisture data and the selection date. The method of the present application can quickly obtain large-scale, root-layer field water holding capacity data with high accuracy, providing scientific, effective, and practical assistance for at least drought monitoring, drought relief management, and farmland irrigation. Through this method, unnecessary financial and material expenditures can be reduced, acquisition costs can be greatly reduced, and the efficiency of actual drought relief management can be significantly improved.