217 results about "Shear strength (soil)" patented technology

The invention relates to the technical field of design analysis, in particular to a soft soil deep foundation pit earth excavation construction scheme planning method and system.The soft soil deep foundation pit earth excavation construction scheme planning method comprises the following steps that a three-dimensional geological model is built based on geological exploration data, and rheological parameters, shear strength parameters and permeability coefficients of all soil layers are extracted to serve as layering parameters; according to the layering parameters and preset supporting structure rigidity parameters, a soil body rheological rate compensation coefficient is calculated, and an earthwork block excavation scheme with the grading thickness difference is generated; and in the excavation process, the displacement rate and pore water pressure data of the supporting structure are collected in real time, and when a monitoring value exceeds a preset threshold value, a dynamic adjustment instruction of the block excavation scheme is triggered. According to the method, the layering thickness and the blocking form are intelligently controlled according to different sensitivity levels, the matching coping capacity for soft soil instability inducements is improved, and the limitation that a single physical parameter dominates in traditional blocking design is broken through.

The invention provides a construction method and system of a rock-soil shear strength parameter prediction model, and relates to the technical field of model construction.The construction method comprises the steps that CT scanning data of a real rock-soil sample is obtained and preprocessed, and an irregular three-dimensional particle set for geometric modeling is obtained; performing particle surface roughness modeling analysis on the three-dimensional particle body set to obtain a surface roughness coefficient set of the three-dimensional particle body set; performing particle size cumulative distribution function segmentation processing and fractal dimension control on the surface roughness coefficient set to obtain a structure grading sample set; constructing a THMC multi-field coupling model based on the structure grading sample set to obtain a working condition particulate matter physical response parameter set; and performing a simulation experiment on the working condition particle physical response parameter set, and performing deep neural network modeling processing based on an experiment result to obtain a strength response model capable of predicting the cohesive force and the internal friction angle of the rock-soil body under any working condition input. According to the invention, the prediction efficiency and accuracy are significantly improved.

The invention provides a GNSS-based mountain area highway loess slope stability evaluation method and system, and relates to the technical field of loess slope stability evaluation.The method comprises the steps that firstly, a slope area is divided into grids, geologic feature data of each grid are obtained, super nodes are divided according to the geologic feature data, and the super nodes are divided into super nodes; monitoring points are determined, and the soil moisture content is monitored, so that the moisture content of the soil at different depths is analyzed; secondly, the original displacement is monitored through a GNSS, displacement correction is carried out based on the Fredld unsaturated soil shear strength theory, and the actual displacement is obtained; the influence of the accumulated rainfall on the soil body strength parameters is analyzed, and the soil body strength parameters are corrected in real time; coupling the corrected soil body strength parameter with the actual displacement, calculating a safety coefficient, and judging an early warning state according to the rainfall sensitivity coefficient; and finally, comprehensively judging the stability of the slope according to the early warning state. According to the method, through multi-parameter comprehensive analysis, the accuracy of slope stability evaluation is improved.

The invention discloses a high and cold arid region slope soil stability safety risk evaluation system and method, and relates to the technical field of slope engineering. The state of each side slope under multi-dimensional indexes such as freeze-thaw cycle frequency, dry-wet alternation index, wind erosion strength, shear strength, water content, porosity and fracture density is quantified, the feature similarity between any two side slopes is calculated, and then a side slope feature similarity matrix is formed. Based on the matrix, an unsupervised clustering algorithm (such as spectral clustering, similarity propagation and the like) can be adopted to divide a plurality of side slopes into similar subsets with structural characteristics similar to environmental response, and category attribution of risks is achieved. On the basis, structural variation analysis, historical instability statistics and central risk difference extraction are performed on similar slope samples, so that the internal instability tendency of the slope can be identified, and a risk prediction model suitable for the type of slope can be constructed through feature training.

The invention belongs to the technical field of ocean geotechnical engineering, and discloses full-strain range soil body strength characteristic testing equipment and a testing method for simulating a deep sea temperature and pressure environment. The system comprises an integrated probe, a stepping motor, a linear module, a hollow probe rod, a torsion module, a loading platform, a sample box, a water depth simulation system and a temperature control system. The hydraulic source and the temperature controller are used for simulating the deep sea low-temperature and high-pressure environment, the simulation effect is good, soil sample visualization is achieved, static sounding and vane shear tests are combined by designing the integrated probe, the soil permeability coefficient, the consolidation coefficient, the undrained shear strength and the sensitivity are measured, the precision and the efficiency of soil parameter analysis are improved, and the method is suitable for popularization and application. And data complementation, efficiency optimization and precision improvement are realized.

The invention relates to the technical field of geotechnical engineering safety monitoring and evaluation, in particular to a soft rock slope stability dynamic evaluation method which comprises the following steps: S1, acquiring slope environment parameters, construction parameters and geological basic parameters; s2, through simulation of the whole rainfall infiltration process, the spatio-temporal evolution characteristics of pore water pressure in a slope rock stratum are quantified, the aging relation between soil shear strength degradation caused by rainwater and slope displacement is analyzed, and a slope instability threshold calculation model is established; and S3, analyzing the monitored deformation and displacement cumulative effect of the slope and the migration characteristics of the rock stratum slip plane under the load action of the construction vehicle, and constructing a rock stratum instability risk assessment model based on the construction parameters. By comprehensively considering the influence of environmental parameters, construction parameters and geological basic parameters on the slope stability, dynamic evaluation and graded early warning of the slope stability are realized, a construction scheme can be pre-evaluated, and a construction reference is provided for safety management and control of a soft rock slope project.

The invention relates to a method for optimizing a newly-built anchor rod supporting system for slope expanding excavation by using residual anchor rods. The method comprises the following steps: preliminarily selecting a plurality of excavation schemes of different excavation slope angles according to the geometrical morphology of the side slope and the layout of anchor rods; calculating the excavation area and the residual length of the anchor rod of each scheme; calculating the theoretical ultimate uplift bearing capacity of the residual anchor rod based on the soil nail theory; midas GTS NX software is used for establishing a slope stability numerical simulation model considering and not considering the influence of residual anchor rod reinforcement, and a safety coefficient and anchor rod axial force distribution are calculated; by comparing the maximum axial force of the residual anchor rod obtained through numerical simulation calculation with the ultimate uplift bearing capacity obtained through theoretical calculation, the authenticity of the numerical simulation calculation safety coefficient is judged, and the true safety coefficient is sought; calculating a rock-soil body shear strength parameter adjustment coefficient according to the true safety coefficient to obtain an enhanced rock-soil body shear strength parameter, inputting the enhanced rock-soil body shear strength parameter into geotechnical engineering design software, and designing a newly-built support structure; and finally, technical and economic comparison and selection are carried out on the schemes, and the optimal scheme is selected.

The invention discloses flow-state solidified soil based on a waterproof consolidation agent and a preparation method thereof, and relates to the technical field of flow-state solidified soil, the flow-state solidified soil comprises original soil, the waterproof consolidation agent and water; the waterproof consolidation agent comprises a powder consolidation agent and a liquid consolidation agent; the liquid consolidation agent comprises emulsified silicone oil and emulsified asphalt. The powder component and the liquid component serve as the two-component consolidation agent, cement, slag, fly ash and other components in the powder consolidation agent can form a matrix structure in solidified soil, the stability of the solidified soil is improved, the compression resistance and shear strength of the solidified soil are enhanced, and the overall bearing capacity and stability of the solidified soil are improved; the liquid consolidation agent adsorbs the original soil and the powder consolidation agent to form a three-dimensional space framework, connection among soil particles is enhanced, the overall strength of the soil is improved, the compressive strength and the water stability of the solidified soil are better, and then the anti-freezing capacity of the solidified soil is improved.

The invention provides a main shock and aftershock sequence side slope vulnerability analysis method and system based on double response indexes, and relates to the technical field of earthquake side slope vulnerability analysis, and the method comprises the steps: building a GeoStudio side slope model according to the physical parameters of a side slope soil body, and obtaining the initial static safety coefficient and critical acceleration of the side slope; performing incremental dynamic time history analysis according to the main earthquake ground motion data, the slope model and the initial static safety coefficient of the slope to obtain a soil shear strength parameter value after the main earthquake; updating the initial critical acceleration of the side slope to obtain the critical acceleration of the side slope after the main earthquake; performing aftershock increment dynamic time history analysis according to the aftershock oscillation data and the critical acceleration of the side slope after the main shock to obtain a safety coefficient value and an accumulated displacement result of the soil body after the aftershock; and defining a vulnerability function based on the logarithmic normal cumulative distribution function to obtain a multi-level slope vulnerability curve. According to the method, the slope risk assessment precision and the visual decision-making capability are improved.

The invention discloses a shear strength parameter determination method considering earthquake action, which comprises the following steps: collecting a soil sample of a research area, air-drying, dispersing the soil sample into single particles, and sieving to obtain the stone content of the soil sample; the method comprises the following steps: preparing a compacted cylindrical sample from a soil sample, and placing the compacted cylindrical sample in a triaxial testing machine for a triaxial test to obtain static strength parameters of the soil sample; collecting seismic magnitude data of the research area, and determining the seismic magnitude of the research area; and according to the stone content, the static strength parameter and the earthquake magnitude, calculating the shear strength parameter of the research area under the earthquake action by adopting a shear strength damage cracking model. Based on PFC numerical simulation software, dynamic triaxial numerical simulation of the accumulation body is carried out and compared with an indoor test result, the change rule and numerical value of the numerical simulation result are close to those of the indoor test result, the parameter error is smaller than 50%, and the reasonability of the established accumulation body sample model and the calculated dynamic strength parameters is verified.

The invention relates to a slope instability probability evaluation method based on burial depth constraint space random field simulation, and belongs to the technical field of slope engineering. The method comprises the following steps: acquiring shear strength parameters c and phi at different buried depths of a slope soil body in a research area; the obtained shear strength parameters are expanded according to Gaussian process regression in combination with a radial basis function, the reliability of the expanded parameters is determined through K-S inspection, and cross correlation between c and phi is obtained; determining statistical characteristics of the c and phi expansion data; under the burial depth constraint condition, slope model determinacy research is carried out, a safety coefficient is calculated, the model is compared with a traditional model, and the difference between the potential slip plane of the slope under the burial depth constraint and the potential slip plane of the traditional slope is obtained; the traditional Monte Carlo simulation MCS is optimized; according to deterministic analysis and a random field theory, carrying out uncertainty research on the side slope under the burial depth constraint, and calculating the instability probability of the depth evolution random field side slope model.

The invention belongs to the field of geotechnical engineering, and provides a rock-soil body parameter intelligent test method and system based on artificial intelligence, and the method comprises the steps: obtaining the shear experiment data of a rock-soil body under different environment conditions, and calculating an equivalent shear weakening coefficient according to the experiment data; the shear modulus of the material is adjusted by weakening the shear strength of the rock-soil body through the water weakening factor; deriving a shear damage constitutive model under the action of the dynamic water head, and calculating the shear stiffness of the rock-soil body; establishing a Gaussian process regression model through experimental data and the shear stiffness obtained through calculation; carrying out global optimization on the Gaussian process regression model by adopting a self-adaptive stochastic optimization algorithm; dynamically adjusting model parameters; and outputting a final optimized rock-soil body parameter prediction result.

The invention relates to the field of deep horizontal displacement monitoring, and provides a deep horizontal displacement correction method and system based on the starting depth of an inclinometer. The method for correcting the deep horizontal displacement based on the starting depth of the inclinometer comprises the following steps: if the starting depth is the bottom of the inclinometer, calculating a first difference value between the corrected deep horizontal displacement at the orifice of the inclinometer and the absolute value of the horizontal displacement at the orifice of the inclinometer; if the starting depth is not equal to the bottom of the inclinometer tube, calculating a second difference value between the corrected horizontal displacement of the deep layer at the bottom of the inclinometer tube and the absolute value of the horizontal displacement at the bottom of the inclinometer tube; distributing the first difference value or the second difference value to each soil layer according to the reciprocal of the shear strength to obtain a first distribution error; determining a second distribution error of each monitoring point of each soil layer according to the number of the monitoring points contained in each soil layer; and obtaining a final displacement absolute value of each monitoring point according to the corrected deep horizontal displacement of each monitoring point. And the accuracy of deep horizontal displacement is improved.

The invention provides a soil body-structure interaction boundary damage quantitative testing device and method, and relates to the technical field of geotechnical engineering test.The soil body-structure interaction boundary damage quantitative testing device comprises a stress conduction boundary shear strength and rigidity combined testing structure and a testing system integrating a shaft confining pressure-temperature collaborative loading system and a monitoring collection and process control system; through an improved slurry sample preparation method, tight connection and constant contact area between the hollow columnar soil sample and the friction pile body are ensured, and the test sealing performance is enhanced through the elastic sealing design; the real-time measurement of the rigidity of different positions in the whole shearing process is realized by virtue of the excitation damage detection element capable of synchronously moving; according to the method, the constitutive model of the marine rock-soil stress conduction boundary domain is perfected, a reliable experimental basis is provided for foundation design of deep-sea engineering such as submarine pipelines and anchoring structures, and the method has important theoretical value and engineering significance for improving design scientificity and safety of deep-sea infrastructures and preventing and controlling submarine geological disasters.

The invention relates to a construction method of an embedded depth empirical formula under the limit of a high holding power anchor group. The construction method comprises the following steps: S1, establishing a solid model of a finite element model of the high holding power anchor group; s2, working conditions of the finite element model are designed in a grouped mode, and the influences of the seabed surface mooring chain loading angle # imgabs0 #, the mooring chain dragging speed # imgabs1 #, the seabed soil surface undrained shear strength # imgabs2 # and the soil body undrained shear strength gradient # imgabs3 # on the embedding depth of the large holding power anchor set under the limit are analyzed; s3, according to all working condition analysis results of the finite element model, the limit embedding depth of the large holding power anchor group is obtained, and an empirical formula # imgabs4 # of the limit embedding depth of the large holding power anchor group is obtained through multivariate function fitting; and S4, setting a verification working condition through an orthogonal test method, comparing the empirical formula with a finite element analysis result, and verifying the reliability of the empirical formula.

The invention relates to the technical field of slope risk early warning based on slope data processing, in particular to a rock slope stability evaluation and early warning method, system, equipment and medium. The method comprises the following steps: firstly, obtaining an initial instability score and a slope stability type of a rock slope based on a gradient, rock-soil body shear strength and a structural surface development degree; then, considering the influence of potential slope instability in a rock slope group on the stability of a neighborhood slope, updating the initial instability score of the slope, and obtaining an initial comprehensive instability score of the slope; then, calculating an environmental instability score increment of the rock slope caused by rainfall, and updating the initial comprehensive instability score to obtain an updated comprehensive instability score of the rock slope; and finally, performing rock slope risk early warning according to a comparison result of the updated comprehensive instability score of the slope and an instability score threshold value. When the method is applied to the safety early warning of the rock slope, the accuracy and timeliness of the safety early warning of the rock slope can be improved.

The invention discloses a Duncan nonlinear shear strength relation linearization-based earth and rockfill dam slope stability subitem coefficient design method, which comprises the following steps of: firstly, according to an assumed linear shear strength index, carrying out dam slope stability subitem coefficient method analysis and calculation by adopting a simplification method; obtaining the initial subitem coefficient safety margin eta0 of dam slope stability and the initial stress state of each soil strip bottom surface, calculating a linear shear strength index corresponding to the Duncan nonlinear strength relationship according to the initial subitem coefficient safety margin eta0 and the initial stress state, carrying out dam slope stability subitem coefficient method calculation by adopting a strict stability analysis method again, and carrying out multiple iterations to obtain the stability of the dam slope. And obtaining the final value of the safety margin of the subitem coefficient of the dam slope stability of the earth and rockfill dam until the safety margins of the subitem coefficients obtained in two times are close. The method is a beneficial supplement for a dam slope and dam foundation anti-sliding stability analysis subitem coefficient method in existing rolling type earth and rockfill dam design specifications.

The present invention discloses a method for predicting the lateral deformation of a drainage board foundation under vacuum combined preloading, comprising the steps of calculating the initial undrained shear strength of the foundation soil, calculating dimensionless characteristic parameters, calculating the stress ratio of the soil at the end of the preloading, calculating the reference vertical strain of the soil under one-dimensional compression conditions, calculating the ratio of the lateral strain to the one-dimensional compressive strain of the soil, calculating the lateral strain of the soil, and calculating the lateral deformation of the foundation. This application is based on a relationship diagram between the stress ratio and the characteristic parameters and a quantitative relationship diagram between the lateral strain / one-dimensional compressive strain of the soil and the soil stress ratio / static earth pressure coefficient of the soil. The method can quickly calculate the lateral deformation of the drainage board foundation under vacuum combined preloading, providing a reference for the design of drainage board foundations treated with vacuum combined preloading.

The invention discloses a multi-scale research method for soil body strength degradation under the dry-wet cycle effect. The multi-scale research method comprises the following steps: S1, preparing a sample from collected test soil under the dry-wet cycle effect; s2, testing the macroscopic shear strength of the soil body by using the triaxial sample prepared in the step S1; s3, the cutting ring sample prepared in the step S1 is used for soil microcosmic fracture testing; s4, carrying out a soil body micro-pore test by utilizing the microstructure sample prepared in the step S1; and S5, analyzing the soil body strength degradation rule of the collected test soil under the dry-wet cycle action by using the test results of the soil body macroscopic shear strength test, the soil body microcosmic crack test and the soil body microcosmic pore test. According to the method, through multi-scale analysis, related enterprises can more comprehensively evaluate the degradation rule of the soil body under the dry-wet cycle effect, so that an engineering construction design scheme is optimized, and the risks of landslide, collapse and other engineering accidents caused by soil body strength reduction are reduced.

The invention discloses a pile-soil interface shearing algorithm considering related characteristics of a soil body state. The pile-soil interface shearing algorithm is suitable for calculating pile side friction resistance after a pile foundation is driven in offshore engineering. The method mainly comprises the following steps: (1) transferring stress and strain tensors obtained by calculation of a constitutive model considering that rigidity and strength parameters of a soil body change along with the state of the soil body to a soil and structure interface shear model; (2) assuming that a soil and structure contact interface is in a simple shearing state, and iteratively solving the normal strain of the interface; and (3) calculating the normal stress and the interface tangential stress through the calculated normal strain, and considering the influence of the strength change of the pile-side soil body on the interface shear strength. According to the method, the soil constitutive model related to the state is introduced on the basis of traditional coulomb friction, constitutive responses of the soil in different confining pressure and shear strain states can be reflected, pile-soil interface mechanical behaviors are calculated, and the influence of soil characteristics on the interface behaviors is reflected more reasonably.

The invention relates to a dynamic rotary shear testing device and a dynamic rotary shear testing method for evaluating a crawler-soil shear effect of a deep-sea mining crawler. Comprising a four-state environmental control system which is composed of different-state soil and an annular structure and simulates the surface characteristics of deep-sea soft soil in transition from a flow state to a plastic shape along with depth increase; the soil stress simulation system is composed of an air bag and a sand cushion layer and accurately reproduces the stress state of the crawler teeth in the deep sea environment; the soil body loading system is composed of a sand cushion layer, an air bag and a high-pressure air cylinder and is used for simulating deep sea soil environments with different burial depths; the track tooth dynamic rotary shear test system is composed of a blade, a torsion bar and a variable frequency motor, and simulates the influence of multiple types of track teeth on the shear strength of deep sea soil; and the data acquisition system consists of a pressure sensor and a dynamic torque sensor. According to the invention, the shear failure process of multiple types of crawler teeth to soil under different deep-sea working conditions is simulated with high precision, the device is simple and easy to operate, and technical support is provided for design optimization of a deep-sea crawler and a crawler-soil action mechanism.

The invention provides a high-filling slope ecological protection construction method, and relates to the technical field of slope protection engineering. The construction method comprises the following implementation steps: step 1, slope pretreatment; the method comprises the following steps: firstly, shaping and trimming a high-filled side slope, cleaning surface topsoil, gravels and weeds, and synchronously presetting a through-type drainage system at the top, the waist and the toe of the side slope; comprising the four steps of anchor rod laying, grouting and anchoring, lattice beam pouring and geogrid laying, specifically, drilling is conducted on the trimmed slope surface of the side slope, anchor rods are laid, lattice beams fixedly connected with the anchor rods are formed through pouring, then the geogrids are flatly laid in the coverage area of the lattice beams, and double fixing is completed. The anti-sliding stability of the slope body is enhanced, the geogrids can disperse the load of the slope body, the shear strength of the surface soil body of the slope is improved, the overall stability of the high-filled slope is remarkably improved, and geological disasters such as landslide and collapse of the slope are effectively prevented.

The invention discloses a design method of a foundation pit multi-arch deformation mode based on a double shear strength theory. The design method comprises the following steps that modeling, calculation and validity verification are conducted on a foundation pit supporting structure designed by adopting an elastic foundation beam principle; influence partitions of the corner of the foundation pit are determined, the critical pile diameters of the support piles are determined, the pile diameters of the different influence partitions after optimization design are given, and whether the pile distance meets the requirement or not is checked; a limit arch span calculation formula is obtained through derivation, and the limit arch span is determined through soil layer parameters at the excavation depth of the foundation pit; comprehensively considering the limit arch span, the inner support position and the influence partition, arranging arch springing piles, and checking whether the pile distance meets the requirement or not; the three-dimensional calculation model is updated, and stress and deformation of the foundation pit are calculated; and 4, comparing stress deformation results of the foundation pit, if the results are ideal, determining an optimization design scheme, and if the results are not ideal, returning to the step 2 or the step 4. The calculation formula of the limit arch span is deduced, and deformation of the foundation pit and the influence on the surrounding environment can be effectively reduced.

The invention discloses a PINN-based slope soil shear strength parameter inversion method, which comprises the following steps: determining a geometric model of a slope, and arranging a plurality of monitoring points in the slope; uniformly collecting a plurality of coordinate points in a domain and a boundary defined by the geometric model, wherein the collected coordinate points comprise all monitoring points; constructing a physical information neural network taking coordinates of the coordinate points as input and displacement prediction data of the coordinate points as output; the method comprises the following steps: initializing a shear strength parameter of a slope soil body, taking the shear strength parameter as a hyper-parameter of a physical information neural network, constructing a comprehensive loss function, and training the constructed physical information neural network by taking minimization of the comprehensive loss function as a target; and when a preset convergence condition is reached, outputting the shear strength parameter of the side slope soil body. According to the method, the data preparation cost is saved, the displacement field predicted by the mandatory neural network and the stress field derived from the displacement field must meet the yield criterion and the force balance condition of the material, and it is ensured that the shear strength parameter obtained through final inversion is mechanically self-consistent.

The invention relates to the technical field of data processing, and provides a reservoir bank landslide soil body shear strength parameter inversion method, device and equipment and a storage medium, the effective value range of soil body shear strength parameters is determined by obtaining a target safety coefficient, a training sample set is generated in the effective value range through numerical simulation, and according to the training sample set, the reservoir bank landslide soil body shear strength parameter inversion method and device are obtained. And constructing a safety coefficient prediction model through a machine learning method, searching in an effective value range according to the safety coefficient prediction model and the target safety coefficient, and determining a soil shear strength parameter inversion result matched with the target safety coefficient. According to the method, accurate acquisition of the shear strength parameters of the reservoir bank landslide soil body is achieved, meanwhile, more data values are released through existing information in the deep excavation exploration stage, automation and high efficiency of the inversion process are achieved, dependence on manual experience trial calculation is thoroughly eliminated, and the method is suitable for large-scale popularization and application. And finally, a scientific basis is provided for engineering design optimization and disaster prevention and control decision making of reservoir bank landslide.

This invention discloses a gabion reinforcement system for preventing damage to backfill dumps in open-pit mines, comprising: an inner dump, a base, gabions, backfill material, and inclinometers. The inner dump is used for stockpiling the backfill material. The base is the exposed surface after the open-pit mine is completed, serving as supporting soil for subsequent dumping operations and providing geological conditions for laying the gabions. The gabions are laid on the base surface to maintain and reinforce the multi-layered slope structure composed of the backfill material. The backfill material is transported to the inner dump by dump trucks and dumped therein. The inclinometers are used for subsequent monitoring of soil displacement. This invention significantly improves the shear strength of the backfill material, thereby stabilizing the slope of the dump, effectively suppressing the horizontal deformation of the dump steps along the slope direction, and avoiding potential deformation and large-scale landslides that may occur on the dump slope under external erosion.

The invention provides a landslide early warning and evaluation method and system. The landslide early warning and evaluation method comprises the steps of uploading target parameters obtained through periodic measurement of a probe array to a cloud platform, dynamically inverting shear strength parameters of depth points of a sensing section based on the target parameters through an inversion model, and calculating a safety coefficient according to the shear strength parameters; wherein when the safety coefficient is larger than a set threshold value, pre-sliding early warning is triggered; and monitoring the temperature time sequence in real time to obtain the depth of the sliding surface and trigger landslide early warning when the temperature time sequence of any depth point meets the condition of the sliding event, evaluating the volume of the landslide mass based on the depth of the sliding surface, and outputting a landslide report. According to the invention, in-situ and continuous measurement of the target parameters of the soil body can be realized, the attenuation process of the shear strength of the soil body can be sensed in advance, and the loss possibly caused by landslide disasters is reduced; meanwhile, the scale and the influence range of the landslide can be quickly known after the landslide occurs.

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 application discloses a method for reinforcing and supporting soft soil layers along a coast and rapidly recycling steel sheet piles, and the construction method comprises the following steps: measuring data, formulating a construction scheme, conducting a construction test, correcting a theoretical analysis, organizing implementation, implementing deviation correction, and recycling materials. According to the method, the pore water in the soil is slowly drained by arranging vertical drainage plates, the pore ratio is reduced, the foundation is deformed, the strength of the foundation soil is gradually increased, the drainage distance is shortened by arranging the vertical drainage plates, the consolidation of the foundation is accelerated, the preloading period of the preloading project is shortened, the foundation can reach a good consolidation effect in a short period of time, the growth of the shear strength of the foundation soil is accelerated, the rate of the improvement of the bearing capacity of the foundation is always greater than the rate of the increase of the construction load, and the stability of the foundation is ensured, the vertical supporting system is formed by combining the lock buckle of the pipe pile and the steel sheet pile, so that the rapid enclosure construction is facilitated, the pipe pile and the steel sheet pile are convenient to disassemble and recycle, and the prefabricated assembly construction is realized.

The present invention relates to a method for calculating the anti-uplift stability coefficient taking into account the shear strength of the soil above the caisson blade foot, and the method comprises the following steps: (1) determining calculation parameters, which mainly include the thickness, density, internal friction angle, cohesion, ground overload, soil plug height in the well, and geometric dimensions of the caisson; (2) determining the type of the caisson according to the width and sinking depth of the caisson; (3) according to the determined different caisson types, substituting the calculation parameters into a calculation expression to calculate the anti-uplift stability coefficient of the caisson structure; the method for calculating the anti-uplift stability coefficient taking into account the shear strength of the soil above the caisson blade foot proposed by the present invention can quickly and accurately analyze the anti-uplift stability of the caisson in actual engineering, and provide theoretical support for design and construction.