21 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 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.

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 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 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 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.

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 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 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 invention discloses a large slurry stirring device and method, and belongs to the technical field of slurry stirring, and the large slurry stirring device comprises a support, a slurry stirring tank, a vacuum extraction unit and a control terminal. The slurry stirring tank is fixed to the support, a vacuum environment is formed through the vacuum extraction unit, the low-speed stirring unit and the high-speed stirring unit which rotate reversely are arranged in the slurry stirring tank, the low-speed stirring unit mixes soil and water in the tank body, and the high-speed stirring unit provides a speed gradient through a high-speed rotating cutter head to break the laminar boundary. Meanwhile, the low-speed stirring unit and the high-speed stirring unit rotate in opposite directions, so that the water and soil collision probability is greatly increased, the mixing and stirring efficiency is improved, and a saturated soil texture model conforming to a supergravity test is obtained. The vacuum extraction unit and the slurry stirring tank achieve whole-process automatic operation through the control terminal. The stirring device provided by the invention has the advantages of high stirring efficiency and high automation degree, and is suitable for preparing a large-scale supergravity test soil model.

The invention discloses an embankment leakage identification and classification method based on temperature rise characteristic values and flow velocity inversion, and the method comprises the steps: arranging an active heating type optical fiber as a leakage monitoring device in a certain depth foundation soil body of a soil embankment downstream slope or an outer slope toe, and obtaining a temperature rise time history curve in the embankment foundation soil body in a certain power heating mode; and calculating a temperature rise value and a soil body temperature rise characteristic value after heating stabilization, comparing the temperature rise value and the soil body temperature rise characteristic value with a critical threshold value determined by a water injection test to realize qualitative identification of the soil dike leakage section, and when the soil body temperature rise characteristic value is lower than the critical value, identifying the corresponding section as a leakage section. On the basis, a quantitative function model of temperature rise and seepage velocity is deduced based on a saturated soil mass heat transfer mechanism and a heat conductivity coefficient-compaction degree relation, the seepage velocity is inverted in an abnormal section, the severity of seepage is judged according to the seepage velocity of a seepage section, and seepage strength grading is achieved. And the whole-process discrimination from qualitative identification of the leakage section to quantitative grading of the dike leakage strength is realized.

The invention discloses a method and system for constructing a critical state constitutive model of over-consolidated gas-bearing clay, and the method comprises the following steps: 1, dispersing the gas-bearing clay into two phases of a saturated soil matrix and a gas cavity according to a composite material theory, and obtaining a stress-strain relationship; step 2, establishing a local drainage equation of pore water flowing into the gas cavity; step 3, constructing a teardrop type yield surface function with an adjustable shape; 4, weakening parameters are introduced, weakening items are obtained, and a hardening law with a weakening effect is obtained; 5, according to the stress and strain relation, the local drainage equation, the yield surface function and the hardening law, a critical state elastic-plastic constitutive model of the over-consolidated gas-containing clay is obtained; and 6, according to the test data of the gas-containing kaolin, reversely calibrating parameters and weakening parameters for modifying the shape of the yield surface. The method aims at obtaining the constitutive model capable of accurately describing the mechanical response of the high-precision over-consolidated gas-containing clay in the complex stress state.

The invention discloses a simulation method for quantifying adsorbed water and free water in an unsaturated soil porous medium, and relates to the technical field of molecular simulation, according to the method, a coarse graining molecular dynamics method is adopted, Wyoming sodium-based montmorillonite is selected as the unsaturated soil porous medium, microscopic water absorption and expansion behaviors of a Wyoming sodium-based montmorillonite system are studied, and then on the basis of the GB potential, the water absorption and expansion behaviors of the unsaturated soil porous medium are studied. The aging evolution and the structural response of the aggregate expansion stress of montmorillonite in the water absorption process are systematically analyzed, and the influence mechanism of the energy well depth on the expansion stress is disclosed from the angles of distribution and proportion of different types of pore water and arrangement change of laminates. According to the method, the coupling relation between the soil expansion stress and the bound water content and the coupling relation between the soil expansion stress and the total number of laminates in the unsaturated soil medium are quantitatively revealed, the mechanism of microcosmic hydration expansion of montmorillonite under the regulation and control of the energy well depth is clarified, and distinguishing of adsorbed water and free water and dynamic content quantification under the microscale are achieved.