90 results about "Soil strength" patented technology

The invention relates to a solidified soil proportion and strength prediction method and system based on SEM image analysis, and belongs to the technical field of solidified soil strength testing. Comprising the following steps: S1, measuring physical indexes of disturbed soil; s2, multi-working-condition sample preparation and maintenance; s3, fractal dimension calculation of the SEM image is carried out; s4, unconfined compressive strength testing; s5, establishing a microstructure inversion model and a macroscopic strength prediction model; and S6, proportion optimization and strength prediction: utilizing the microstructure inversion model and the macroscopic strength prediction model to carry out solidified soil proportion optimization or strength prediction. According to the method, the quantitative relation between the microstructure (fractal dimension) and the macroscopic strength is established through SEM image analysis, the defects in the prior art are overcome, and a brand new technical path is provided for resource utilization of disturbed soil.

The invention relates to an iron tower foundation safety analysis method considering the dry-wet cycle effect. The method comprises the following steps that 1, a soil body strength degradation constitutive model is established; 2, determining iron tower foundation structure parameters and soil body parameters; 3, establishing an iron tower foundation-soil body three-dimensional geometric model by utilizing three-dimensional modeling software and rock-soil finite element simulation software; 4, applying a load transmitted to the iron tower foundation by the power transmission iron tower in the iron tower foundation-soil body three-dimensional geometric model, defining initial parameters, and establishing a rainwater seepage and dry-wet cycle coupling effect analysis model; 5, analyzing and predicting the cycle index when the safety coefficient of the iron tower foundation is reduced to a threshold value from the two aspects of tower foundation ultimate bearing performance and iron tower foundation-soil body interaction on the basis of a rainwater seepage and dry-wet cycle coupling effect analysis model; according to the method, an efficient and accurate numerical analysis means can be provided for safety assessment of the power transmission tower foundation in the collapsible loess area.

An agricultural machine includes a soil strength generation system that generates an output indicator of soil strength. A control system generates on action signal based on the soil strength.

The invention discloses a dredged mud upper and lower part double-face combined vacuum consolidation drainage method, which comprises the following specific implementation processes: laying a horizontal sand bag containing a PVC (Polyvinyl Chloride) pipe and a vertical drainage pipe at the bottom of a cofferdam foundation pit to serve as a bottom drainage system, blowing and filling dredged mud in a layered manner, controlling the thickness and the water content of each layer, and when the water content of a soil body is lower than twice liquid limit, stopping drainage; starting the bottom vacuum water pumping device to perform preliminary water drainage, inserting straw bundles into the soil body through hollow pipes with bottom covers to form a vertical water drainage structure after the strength of the soil body meets the requirement, sequentially laying geotechnical cloth, a straw woven blanket, a PVC water drainage pipe network and a sealing film on the top to construct a top vacuum system, and finally synchronously starting the top vacuum water pumping device and the bottom vacuum water pumping device. The vacuum difference is controlled by adjusting the ventilation device, and upper and lower double-face combined vacuum consolidation drainage is achieved. The drainage consolidation of the dredged mud is effectively accelerated, the treatment efficiency is improved, and the drainage effect is enhanced through precise control over the vacuum degree and application of materials such as straw.

The invention discloses a goaf microorganism and plant synergistic soil fixation method and a soil fixation device, belongs to the technical field of goaf soil fixation, and aims to solve the problem that an existing goaf fixation process is difficult to realize deep stabilization and ecological restoration synergistic treatment, and the goaf microorganism and plant synergistic soil fixation method comprises the following steps: S1, pretreating the ground surface of a goaf; s2, acquiring goaf data; s3, determining a core reinforcement area and an ecological restoration area according to the model data in the S2; s4, deep injection reinforcement is conducted on the core reinforcement area; step S5, planting plants, step S6, carrying out drip irrigation on the ecological restoration area, and monitoring the matrix strength growth rate S and the plant root development index RDI in real time; s7, determining that the repair is qualified according to the collected data of the S and the RDI; a deep loose matrix is effectively cemented through the microbial mineralization effect, the strength and stability of the soil body are improved, the integrity of the surface soil body and the water and soil conservation capacity are enhanced through plant root systems, and the synergistic enhancement effect is formed.

An agricultural machine includes a soil strength generation system that generates an output indicator of soil strength. A control system generates on action signal based on the soil strength.

The application provides a loess slope stability evaluation method and system based on GNSS, and relates to the technical field of loess slope stability evaluation.The application first divides the slope area into grids, obtains geological feature data of each grid, divides super nodes according to the geological feature data, determines monitoring points and monitors soil moisture content to analyze the soil moisture content at different depths.Secondly, the original displacement is monitored by using GNSS, the displacement is corrected based on the Fredlund unsaturated soil shear strength theory to obtain the actual displacement, the influence of cumulative rainfall on the soil strength parameter is analyzed, and the soil strength parameter is corrected in real time, the corrected soil strength parameter and the actual displacement are coupled, the safety factor is calculated, and the early warning state is judged according to the rainfall sensitivity coefficient.Finally, the stability of the slope is comprehensively judged according to the early warning state.The method improves the accuracy of the slope stability evaluation through comprehensive analysis of multiple parameters.

The invention relates to the technical field of data processing, and discloses a method for determining construction parameters of foundation pit excavation. Rainfall information and construction progress information of the to-be-excavated area in the foundation pit excavation process are obtained; determining target soil body strength and underground water level information of the to-be-excavated area according to the rainfall information; inputting the target soil body strength, the underground water level information and the construction progress information into the first finite element model to obtain a second finite element model; and through a second finite element model, or through a particle swarm algorithm and the second finite element model, optimizing the first construction parameter to obtain a second construction parameter. According to the technical scheme, the construction parameters can be adjusted according to the rainfall information in the excavation process of the foundation pit, the deformation condition of the foundation pit after excavation of the foundation pit can be reduced, and the safety and the excavation efficiency of the foundation pit can be improved.

The application discloses a kind of solidified soil strength calculation method and system considering freeze-thaw cycle number and burying depth, propose the strength and modulus reduction factor concept of solidified soil under different freeze-thaw cycle;Then according to the test data obtained, the strength and modulus reduction factor of solidified soil under the action of freeze-thaw cycle under different burying depth is calculated;Strength and modulus reduction factor and burying depth, freeze-thaw cycle number composite exponential function model is established;Through composite exponential function model, the reduction factor of solidified soil under different freeze-thaw cycle is calculated, the strength and modulus of solidified soil without freeze-thaw cycle obtained by indoor test are combined, and the strength and modulus of solidified soil under different depth and freeze-thaw cycle are calculated.In practical engineering, the strength and modulus of solidified soil under different freeze-thaw cycle number at different burying depth can be used for long-term strength and deformation calculation of foundation.

The application discloses a large-section railway tunnel surrounding rock stability control method, comprising the following steps: step S1, using a soil strength device to detect the strength in the tunnel; step S2, dividing out the broken area with soil strength lower than a predetermined threshold and marking it as a low-strength area, and dividing out the area with soil strength higher than the predetermined threshold and marking it as a high-strength area; step S3, according to the different strength parameters of each low-strength area, calculating the amount of grouting material needed to be injected into each low-strength area to achieve the same strength, and injecting the corresponding amount of grouting material into each low-strength area; step S4, covering the surface of the low-strength area with a glass fiber cloth; and step S5, coating a layer of concrete. According to the application, targeted grouting is carried out according to the different strengths of different broken areas, so that the broken areas with different strengths can achieve relatively consistent strength after reinforcement treatment, and the purpose of uniformly strengthening the tunnel is finally achieved.

The invention belongs to the technical field of rock-soil detection devices, and particularly relates to rock-soil strength detection equipment and method for road and bridge engineering geological investigation. Inserting bottom rods are evenly arranged at the bottoms of the splicing sliding rails, the two splicing sliding rails are assembled together to form a long-strip-shaped guide rail, the long-strip-shaped guide rail is laid on the road surface, and the long-strip-shaped guide rail is simply fixed through the inserting bottom rods; wall-attached rotating wheels are symmetrically arranged at the bottom of the movable base, and the outer surfaces of the wall-attached rotating wheels are in rolling connection with the inner walls of the splicing sliding rails. Data analysis is carried out on the undeveloped road section, the spliced sliding rail is anchored on the road section through the insertion bottom rod below the spliced sliding rail, and the inner wall of the spliced sliding rail is always kept in a relatively flat state, so that the acquisition component can smoothly slide along the road section, and the phenomenon of rollover caused by road condition problems is avoided; after collection is completed, the collection part and the splicing sliding rail can be recycled, the recycling effect is achieved, and the sampling work of various road conditions is met.

The invention discloses a slope stability prediction correction system and method based on multi-modal deep learning, and the system comprises a prototype prediction branch module and a model correction prediction branch module, and the prototype prediction branch module comprises a soil parameter inversion model and a prototype prediction composite model. The soil mass parameter inversion model is used for inverting and correcting soil mass strength parameters in real time according to the real-time settlement monitoring data of the side slope, and the prototype prediction composite model is used for predicting the stability of the side slope according to geometric parameters of the prototype side slope, the corrected soil mass strength parameters, slope images and settlement monitoring time sequence data; and the model correction prediction branch module is used for correcting slip crack surface position information obtained by the model test according to the parameters of the reduced scale physical model test, the reduced scale proportion and the model test image, and outputting the potential slip crack surface parameters of the prototype slope and the safety coefficient Fs-p of the prototype slope. According to the method, the stability data of the prototype slope can be obtained in real time, the slope stability result of the model test can be automatically corrected, and the prediction accuracy is ensured.

The utility model provides a deep silt soft soil river channel precast pile supporting structure. The deep silt soft soil river channel precast pile supporting structure comprises precast piles, a top beam and reinforcing soil. A plurality of precast piles are arranged along the river bank slope; the bottom of each precast pile is embedded and fixed into the bottom of a river channel, and the precast piles are mutually engaged and nested to form an integral row pile structure; integrally pouring a top beam on the pile top of the integral row pile structure; reinforcing soil is arranged on the passive area side of the river bottom built-in end of the whole row pile structure. According to the utility model, the precast piles and the crown beams are connected with each other, so that the bank slope supporting structure forms an integral stress structure, and the common stress is realized. A curing agent is adopted for local silt soft soil improvement of a river bottom precast pile passive area, the soil body strength of the area is enhanced, and the adverse effect of insufficient river soft soil strength of the precast pile passive area is weakened. Compared with a common cantilever pile support, the precast pile and reinforced soil structure support is better in deformation control and higher in bank slope stability, and compared with gravity type retaining wall support construction, the precast pile and reinforced soil structure support is smaller in excavation range, convenient to operate and smaller in environmental influence.

The invention provides an MICP-based sandy soil reinforcement stability evaluation method, device, equipment and medium, and relates to the technical field of soil reinforcement, and the method comprises the following steps: respectively adding an ammonium standard solution into sodium modified zeolite and alkalization modified fly ash to determine the ammonia nitrogen removal rate, and screening candidate mass ratios; on the basis of the candidate mass ratio, the sodium modified zeolite and the alkalized modified fly ash are doped into the standard sand columns correspondingly, the bacterial liquid and the cementing liquid are injected for an MICP reaction, and a solidified sand column is obtained; the dry density and the calcium carbonate generation amount of the multiple solidified sand columns are measured, an unconfined compressive strength experiment is conducted, and an unconfined compressive strength value is obtained; the distribution form of calcium carbonate crystals is observed through a scanning electron microscope for the multiple solidified sand columns, and gelling substances are analyzed through X-ray diffraction; and judging an unconfined compressive strength value based on a microscopic analysis result, and when the unconfined compressive strength value meets a sandy soil solidification threshold value, outputting a solidification grade and a sandy soil strength value to finish stability evaluation. The problem that sandy soil reinforcement is not stable is solved.

The invention belongs to the field of geological disaster prevention and control, and particularly discloses a slope safety coefficient calculation method considering an upward inclined drainage hole, which comprises the following steps: establishing a slope seepage numerical simulation model containing the upward inclined drainage hole, and obtaining space coordinates of nodes in a slope and pore water pressure data through finite element calculation; generating a potential slip plane based on an upper limit theorem of limit analysis, and calculating a pore water pressure value at each discrete point on the potential slip plane by using a Kriging interpolation method and taking node space coordinates and pore water pressure data as samples; according to the potential slip plane, the soil body strength parameter and the pore water pressure value obtained through interpolation, a balance equation of the soil body gravity power, the pore water pressure power and the internal energy dissipation power when the slope is in the critical failure state is established; and solving the balance equation to obtain the slope safety coefficient considering the inclined drainage hole. According to the method, the slope safety coefficient considering the inclined drainage hole can be efficiently and accurately calculated.

The utility model relates to the field of foundation engineering construction, in particular to a composite pile structure capable of firstly draining water and then reinforcing, which comprises a geogrid rolled into a barrel shape, a layer of geotextile fixed on the inner side surface of the geogrid, a grouting pipe vertically inserted on the inner side of the geotextile, a plurality of radial through holes arranged on the side wall of the grouting pipe at intervals, and a plurality of drainage holes arranged on the side wall of the grouting pipe. The surrounding area between the outer wall of the grouting pipe and the inner wall of the geotechnical cloth and the grouting pipe are filled with broken stones, cement mortar injected after soft soil drainage is poured into gaps among an inner cavity of the grouting pipe, the radial through holes and the broken stones, and the grouting pipe, the broken stones and the geotechnical cloth are fixed into a whole through the cement mortar. According to the composite pile, the soft soil strength can be improved, and the high strength of the composite pile can be fully utilized.

The invention relates to the field of roadbed soil treatment, in particular to a roadbed in-situ soil high-performance ecological reinforcing agent, a preparation method and a construction method, and the reinforcing agent comprises the following raw materials in percentage by mass: 45-85% of sulphoaluminate cement; 8%-25% of Portland cement; 3%-5% of quick lime; 0%-15% of fly ash; 0%-8% of silica fume; 0-15% of superfine slag powder; 3%-5% of sodium sulfate; 0%-2% of sodium silicate; 0%-0.8% of lithium carbonate; 0%-1.5% of a polymer reinforcing agent; 0%-1.5% of organic silicon powder; and 0.1%-0.3% of sodium lignin sulfonate. The reinforcing agent effectively combines the advantages of sulphoaluminate cement and Portland cement, combines other components, has the characteristics of rapid coagulation, rapid early strength development and the like, can regulate and control the soil strength, meets the requirements on compressive strength and durability in engineering construction, shortens the construction period and reduces the construction cost. And the requirement of 4-6h rapid traffic under an emergency repair scene is met.

The application discloses a kind of acid lead-zinc contaminated soil remediation methods, belong to environmental geotechnical engineering technical field.The application includes that acid lead-zinc contaminated soil is mixed with solid component of solidifying agent uniformly, then mixture is sprayed with phosphoric acid solution, obtains solidified soil, completes acid lead-zinc contaminated soil remediation;The solid component of solidifying agent includes by mass fraction: fly ash: 90~100%, diatomite: 0~10%.The application can effectively construct physical adsorption-chemical fixation-structure locking triple solidification mechanism in the process of repair, to effectively strengthen the solidification and stabilization effect of heavy metal pollutants of acid lead-zinc composite contaminated soil, after repair, soil strength can be increased by about 6.59 times, lead, zinc fixation rate is more than 99.7% and 73.9% respectively, compared with traditional cement-based solidifying agent, carbon emission is reduced by about 40%, so that the soil body after repair can maintain stable morphology and heavy metal solidification effect under extreme conditions, realize contaminated soil resource utilization by waste disposal, with the characteristics of efficient and stable, environment-friendly, cost-saving.

The present application belongs to the field of geotechnical, geological and environmental research, and provides a soil strength weakening-recovery characteristic testing device, which comprises an actuation and collection system, a soil disturbance system and a soil strength measurement system. The soil disturbance system adopts a net-like grid structure, and realizes the remolding of soil through rotating the grid; the soil sample strength measurement system mainly refers to the traditional vane shear apparatus, and installs a pore water pressure sensor on the top of the vane head to test the consolidation state of the soil. For the soil at the same position, the process of soil strength measurement-remolding-resting (for different time)-strength measurement is repeatedly carried out to analyze the weakening and recovery law of soil strength. The method of the present application makes up for the lack of effective technical means in the field of current geotechnical investigation in the aspect of soil strength weakening-recovery characteristic testing, and based on the method, the soil strength weakening characteristics and strength recovery law can be quickly and accurately obtained, which provides an important reference for geotechnical engineering design and engineering stability analysis.

The invention discloses a construction inspection method for a solidified soil road. The construction process of the solidified soil road comprises the steps that a roadbed is excavated, roadbed soil materials are compacted, and a stable roadbed layer is constructed; paving the soil material and the curing agent on the surface of the road cushion layer according to the mixing ratio of the dry-mixed cured soil, spraying mixing water mixed with the curing agent, mixing, and compacting and flattening to form a roadbed layer; uniformly mixing and stirring a construction land soil material, a curing agent and water according to a preset proportioning ratio to form flow-state solidified soil, uniformly pouring the flow-state solidified soil onto the grid structure to an elevation, after the flow-state solidified soil is initially set, spreading a wear-resistant agent on the surface of the flow-state solidified soil, and curing to form a pavement layer; the solidified soil road inspection comprises the steps of inspecting the fluidity of the curing agent neat paste before preparing the solidified soil, inspecting the flow state expansion degree of a flow state solidification graph, inspecting the strength of the flow state solidified soil and inspecting the structural strength of the road.

The present application relates to the technical field of subway shield construction, and particularly relates to a subway tunnel mortar cleaning system and a cleaning method, a connection ring dismantling method, a subway tunnel mortar cleaning system, which comprises a detection device, a grouting device and a cleaning device, wherein the detection device is used for detecting a cavity behind a wall of a positive ring segment and a water collection channel; the grouting device is used for grouting and filling the cavity behind the wall of the positive ring segment and the water collection channel; and the cleaning device is used for cleaning the hole portal mortar; the cavity behind the wall of the positive ring segment and the water collection channel are detected by the detection device, then the cavity behind the wall of the positive ring segment and the water collection channel are grouted and filled by the grouting device, so as to block the cavity behind the wall of the positive ring segment and the water collection channel, compact the gap between the positive ring segment and the tunnel, increase the soil strength of the periphery of the tunnel, ensure the stability of the tunnel geology after the connection ring is dismantled, and then the gap between the connection ring and the station structure filled with the hole portal mortar is cleaned by the cleaning device 4.

This invention discloses a centrifuge testing and observation system suitable for suction anchors. The system includes a test foundation and a suction anchor model housed inside a model box, a pulley support assembly on the upper part of the model box, a camera support, a laser displacement measurement assembly, a horizontal loading mechanism, and a support frame. The horizontal loading mechanism connects to the anchor point of the suction anchor model via rigging and the pulley guide frame, thereby achieving model loading. This experimental device has wide applicability, is not limited to any type of test foundation, and the height and position of various support components can be adjusted at any time according to the soil height of the model box and the required loading angle. The system is equipped with a T-bar or CPTu, a laser displacement sensor, a pore pressure gauge, and an accelerometer, enabling precise and diverse measurements of soil strength, soil settlement, pore pressure within the test foundation soil, and model movement. It can efficiently and conveniently observe the dynamic response of the suction anchor and the response of the test foundation soil.

The invention relates to the field of rock-soil testing, in particular to a rock-soil dual-purpose multifunctional electrodeless resistivity detection system and a test method. The device comprises an electrodeless non-contact rock-soil body dual-purpose electromagnetic induction testing device, hydraulic equipment, hard soil strength-resistivity synchronous testing corollary equipment and soft soil deformation-resistivity synchronous testing corollary equipment. According to the system, based on the electromagnetic induction principle and the Ohm law, a closed loop formed by connecting a rock-soil sample and an annular pipe filled with a dielectric solution is creatively used, then the resistivity of the rock-soil sample is calculated by adopting a difference value method, and an original annular mold which can only be used for a soft sample and a sample with the matched size is replaced; and the device is combined with existing rock-soil body strength-deformation corollary equipment for use. According to the invention, the nondestructive resistivity test of the soft and hard rock-soil body is realized, the electromagnetic method has multifunctionality in the resistivity test process of the rock-soil body by combining with corollary equipment, and the resistivity test of the indoor rock-soil body is more convenient, efficient and accurate.

This invention relates to the field of foundation reinforcement engineering, specifically to a grouting hole construction device and construction process. It includes: an outer pipe, a rigid tubular component with several sets of grouting openings evenly distributed circumferentially on its wall, the axial distance between adjacent sets of openings being 0.8-1.2m, each set containing 4-6 through holes with a diameter of 8-12mm; an inner pipe, coaxially inserted inside the outer pipe, with grouting holes on its wall corresponding to the grouting openings on the outer pipe, and a grouting pipeline connected to the top of the inner pipe; and a double-plug grouting assembly, consisting of an upper grouting plug and a lower grouting plug that can move axially along the inner pipe, and a rubber sleeve fitted over the outer pipe. This invention, through double sealing and precise positioning, effectively solves the problems of cross-layering, backflow, and grouting blind spots, improving the rate of soil strength compliance after reinforcement; it shortens the operation time through dynamic displacement, increasing the grout utilization rate to over 80%, and is adaptable to variable-length grouting in soft / hard soil layers.

The invention discloses a stabilized soil scouring protection scheme decision-making method. The method comprises the steps of S1, determining key design parameters of a stabilized soil protection scheme; s2, an equation that the pile foundation solidified soil protection structure reaches the scouring balance state is established; s3, the relation between the solidified soil strength and the erosion protection measure failure probability is established; s4, establishing a relationship between the curing range and the erosion protection measure failure probability; s5, determining a curve that the economic cost of the stabilized soil protection scheme is increased along with the stabilized soil strength and the solidification range; and S6, determining a failure probability value of the solidified soil protection scheme, and further determining an optimal scheme of solidified soil protection. The method can effectively guide the optimization design of the anti-scouring scheme of the solidified soil.

The utility model discloses a foam light soil strength testing device, which comprises a box body, a movable plate and an objective table, the middle part of the upper surface of the box body is fixedly connected with an abutting oil cylinder, a telescopic rod of the abutting oil cylinder is fixedly connected with a pressure applying table, the upper surface of the box body is fixedly connected with a motor I through a protective shell, and sliding chutes I are symmetrically formed in the side surfaces in the box body; a first sliding block is fixedly connected to the position, opposite to the first sliding groove, of the side face of the moving plate, a first groove is formed in the side, away from the first sliding block, of the moving plate, a second screw rod is movably connected to the first groove through a bearing, and the first moving block is slidably connected into the first groove through the second screw rod in threaded connection. The objective table is fixedly connected to the bottom of the box body, a third groove is formed in the upper surface of the objective table, and a second sliding groove is formed in the lower end of the side face of the third groove. According to the foam light soil strength testing device, foam light soil to be tested can be conveniently fixed, and the accuracy of a test result is ensured.

This invention relates to a method, system, equipment, and medium for determining the degree of weakening of passive soil strength in a foundation pit. The method includes: determining multiple target locations within the passive zone of the foundation pit and obtaining the first strength parameters of the soil at each target location before excavation; defining the weakened area within the passive zone, then obtaining and sampling multiple geological parameters within the weakened area to obtain multiple parameter samples; using a numerical analysis model to calculate the calculated deformation value corresponding to each parameter sample after excavation, thereby constructing a surrogate model; obtaining the actual deformation value of the support structure after excavation, using the surrogate model to obtain the geological parameters corresponding to the actual deformation value, and then using a finite element model to calculate the excavation of the foundation pit to obtain the second strength parameters of the soil at each target location after excavation; and obtaining the degree of soil weakening in the passive zone of the foundation pit after excavation based on the first and second strength parameters of each target location.

This invention belongs to the field of marine geotechnical engineering indoor testing technology, and discloses a model test device for testing the rate effect of missile high-speed penetration into seabed soil resistance. The device comprises four parts: a model box system, a reaction frame system, a missile excitation device, and a data acquisition module. This invention also provides a model test method for testing the rate effect of missile high-speed penetration into seabed soil resistance. Through the coordination of the various parts of the test device system, this invention utilizes the data acquisition module to extract the velocity and reaction force changes of the missile passing through water and soil layers at different penetration velocities and soil thicknesses. Finally, it plots the complete penetration velocity-depth curve and penetration resistance-depth curve of the missile, and uses the curves and penetration resistance calculation formula to inversely deduce soil strength parameters. Furthermore, it analyzes the mechanism by which the undrained shear strength of the soil is affected by the soil rate effect, providing a simple and efficient indoor test device and method for studying the high-speed soil resistance and rate effect of cohesive seabed soil.

The invention relates to a foundation pit passive soil body strength weakening degree determination method, system and equipment and a medium, and the method comprises the steps: determining a plurality of target positions in a foundation pit passive area, and obtaining a first strength parameter of a soil body at each target position before foundation pit excavation; in the passive area of the foundation pit, the weakening range is defined, then a plurality of geological parameters in the weakening range are obtained and sampled, and a plurality of parameter samples are obtained; calculating a calculation deformation value corresponding to each parameter sample after excavation of the foundation pit by using a numerical analysis model based on each parameter sample, so as to construct an agent model; the actual deformation value of the supporting structure after the foundation pit is excavated is obtained, geological parameters corresponding to the actual deformation value are obtained through the proxy model, then foundation pit excavation is calculated through the finite element model, and second strength parameters of soil bodies at all target positions after the foundation pit is excavated are obtained; and based on the first strength parameter and the second strength parameter of each target position, the soil weakening degree of the passive area of the foundation pit after excavation of the foundation pit is obtained.

The application discloses a method for obtaining soil strength indexes based on soil layer geophysical prospecting data, and comprises the following steps: S1, obtaining the test depth and equivalent shear wave velocity of different measuring points in a target site; obtaining the drilling samples of each measuring point at the corresponding depth, obtaining the corresponding internal friction angle and soil type; preprocessing the collected data to obtain a comprehensive data set; S2, selecting the test depth and equivalent shear wave velocity in the comprehensive data set as basic features, constructing derived features, performing feature standardization, and obtaining a data set; dividing the data set into a training set and a test set; S3, based on the training set obtained in S2, optimizing and training the soil classification model and the internal friction angle prediction model; S4, obtaining the soil strength index internal friction angle based on the soil classification model and the internal friction angle prediction model obtained by the training in S3. The method of the application realizes high-precision prediction of soil strength indexes by constructing derived features and introducing physical range constraints.