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

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 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 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 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 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 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 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 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.

The invention discloses a rock-soil body in-situ shearing and moisture content density integrated detection device, which belongs to the technical field of geological exploration and comprises a probe rod and a vane shearing head arranged at the bottom end of the probe rod. The cross plate shearing head is installed at the bottom end of the probe rod through the one-way connecting mechanism, rotation of the cross plate shearing head can be controlled in a one-way mode through the collection driving mechanism, the rotation torque is synchronously detected to obtain the shear strength index of the rock-soil body, meanwhile, the sleeve is arranged on the outer side of the probe rod in a sleeving mode, and through the limiting plate arranged on the outer wall of the sleeve, the shear strength index of the rock-soil body is obtained. The position of the sleeve can be circumferentially limited after the probe rod penetrates into the target depth, a density probe and a moisture content probe are integrally installed in the two sets of limiting plates respectively and matched with a lifting mechanism for use, the lifting mechanism can be triggered when the probe rod rotates reversely, and the density probe and the moisture content probe are driven to stretch out and be inserted into soil. In-situ detection of the density and the water content is completed, and the functionality of equipment is improved.

The invention discloses an improvement method for soluble salt in sandy soil, which comprises the following steps: S1, screening the soluble salt-containing sandy soil, separating and removing salt-containing fine particles with the particle size less than the preset particle size, and retaining coarse-particle aggregate; s2, mixing the aeolian sand with fly ash to form a composite modifier; s3, mixing the coarse particle aggregate with the composite modifier to form a uniform mixed soil body; and S4, the mixed soil body is compacted and maintained. Fine particle bodies enriched with soluble salts are removed through physical screening, then the obtained coarse particle aggregate is combined with the aeolian sand and the fly ash to react to generate a gelling substance, the aeolian sand and the coarse particle aggregate are firmly bonded, the fly ash can adsorb and fix a small amount of salt remaining on the surface of the coarse particle aggregate, and the salt content in the coarse particle aggregate is reduced. Salt migration, crystal expansion and corrosion to the structure are effectively inhibited; furthermore, the unconfined compressive strength, the shear strength and the integrity of the improved soil body are remarkably improved, so that the soil body meets the strength and stability requirements of projects such as roadbeds and base layers.

The invention belongs to the technical field of rock-soil and ecological engineering experiments, and particularly relates to a double-sided shear tester for the shear strength of root soil and an experimental method. The sample shearing mechanism is used for placing a sample obtained by in-situ culture of a target soil body; the sample shearing mechanism is arranged in the middle of the main body frame; the sample shearing mechanism comprises a lower fixing ring and an upper fixing ring which are fixed with the main body frame, and a shearing ring which is in horizontal sliding fit with the main body frame, the shearing ring is positioned between the lower fixing ring and the upper fixing ring, the lower fixing ring and the upper fixing ring are coaxially arranged, and when the shearing ring and the lower fixing ring are coaxial, the shearing ring and the upper fixing ring are coaxially arranged. The inner sides of the lower fixing ring, the shearing ring and the upper fixing ring form a cavity for placing a sample; a counter-force unit is arranged in the lower fixing ring, and a pressurizing unit is arranged in the upper fixing ring; one side of the shearing ring is in transmission fit with the movable end of the telescopic mechanism, and a sensor is arranged on the shearing ring; the moving direction of the shearing ring is parallel to the radial direction of the lower fixing ring. The invention further discloses a testing method using the device.

The invention discloses a power transmission and transformation project rock-soil body mechanical property in-situ test landslide stability evaluation device, which comprises a multi-frequency sound wave excitation module, a sound wave characteristic acquisition module, a multi-electrode array measurement module, a mechanical parameter coupling analysis module, a landslide stability dynamic evaluation module and a parameter adaptive optimization module, a dynamic elastic modulus and a dynamic Poisson's ratio are obtained through sound wave propagation characteristic testing, resistivity three-dimensional distribution is obtained through georesistivity tomography, the dynamic elastic modulus and the dynamic Poisson's ratio are innovatively coupled to determine water saturation and shear strength parameters, landslide stability is dynamically evaluated based on the shear strength parameters, and an early warning signal is output. According to the method, the lossless rapid testing of the mechanical property of the rock-soil body and the dynamic evaluation and early warning of the landslide stability are realized.

The present invention relates to the technical field of deep-sea soil exploration, and more particularly to a method for interpreting deep-sea soil parameters. The method comprises: reshaping the deep-sea soil and preparing mud, pouring the mud into a large calibration tank and consolidating it with in-situ stress; conducting a static penetration model test on the consolidated mud to obtain cone tip resistance and pore water pressure; pouring the mud into a large-diameter oedometer and consolidating it with in-situ stress; pushing the soil sample in the large-diameter oedometer to prepare a triaxial specimen, and performing k0 consolidation in a bending element triaxial instrument with the in-situ stress to obtain a standard soil sample; conducting an undrained shear test on the standard soil sample to obtain the undrained shear strength of the standard soil sample, and interpreting the deep-sea soil parameters by comprehensively considering the cone tip resistance and pore water pressure. The present invention improves the accuracy of deep-sea soil parameter interpretation.

The application provides a method for determining the influence of cutter head collision on soil body when two shield machines are butt-jointed in earth, which comprises the following steps: (1) determining the rated torque M 1，max , 2，max of the cutter heads of the two shield machines, the diameters D1 and D2 of the cutter heads and the length L of the shield machines; (2) determining the position A (x0, y0) of the collision point of the two cutter heads; (3) determining the undrained shear strength c u of the soil body around the cutter heads; (4) determining the cutting torque M generated by the cutter heads on the soil body; (5) determining the maximum range of the influence of the deflection of the cutter heads on the soil body; (5-1) determining the central position B (x1, y1) of the rotating cutter head and the intersection C (x2, y2) of the peripheries of the two cutter heads; (5-2) determining the maximum range boundary generated by the cutter heads on the soil body; (6) determining the sectional area of the range of the influence of the cutter heads on the soil body, i.e. the area surrounded by the curve CGF and the curve CDEF; and (7) determining the volume of the influence of the whole shield machine on the surrounding soil body.

The invention discloses a composite foundation design method based on the influence of soil around a pile on the strength of a gravel pile and application, and the design method comprises the steps that each soil layer is subdivided, and the relation between the undrained shear strength value and the depth of each subdivided soil layer is recorded; performing statistics on the data by adopting a mean square error method according to the dynamic sounding hammering number data of the gravel pile, so as to obtain the dynamic sounding hammering number N of each subdivided soil layer; counting the statistical relationship between the undrained shear strength value of each soil layer and the dynamic sounding hammering number N of the gravel pile, and evaluating the compactness of the soil layer; crushing gravel with different compactness through a large direct shear test or a large triaxial test, and establishing a relationship between the different compactness of the gravel and an internal friction angle; establishing an empirical relationship between the strength of the soil around the pile and the value of the internal friction angle of the gravel; and composite foundation parameters are selected according to the subdivided soil layer parameters. The internal friction angle parameter of the gravel pile can be obtained in a layered mode according to the distribution of the soil layer, and the actual mechanical property can be better reflected.

This invention proposes an early warning system and method for the impact of ecological submerged breakwaters on nearshore seabed morphology under tsunami wave action. The system includes: a feature extraction module that collects water pressure data inside and outside the breakwater and establishes a high-energy potential difference time window; a potential energy analysis module that retrieves data within the high-energy potential difference time window and performs differential analysis of the vertical gradient to generate the permeability per unit volume of the seabed surface; an erosion analysis module that obtains the loss coefficient and corrects the static critical initiation shear stress to establish a time-evolving erosion resistance threshold sequence; a concealment identification module that identifies concealed scour zones; and a graded early warning module that quantifies and accumulates the surplus characteristics of shear strength in concealed scour zones using sediment transport rates to obtain morphological loss characteristics, performs stability assessment of the breakwater support structure, and triggers graded collapse early warning. This invention achieves the identification and dynamic early warning of concealed scour risks under low flow velocity backgrounds by quantifying soil weakening caused by seepage.

The invention discloses a precise positioning slope monitoring device for rare earth ore mining, and relates to the technical field of rare earth ore mining, the precise positioning slope monitoring device comprises a ground and a core driving assembly, a support is anchored on the ground, a monitoring module is installed at the top end of the support, and the core driving assembly is installed in a support notch. The core driving assembly comprises a cylinder body fixedly installed at the top end of the notch of the support. According to the precise positioning slope monitoring device for rare earth ore mining, aiming at the pain points that rare earth ore weathering crust loose soil is weak in binding force and prone to sliding, in the first stage, occlusion anchoring is formed through radial expansion of the barb type anchor flukes, the binding force of the main anchor rod and the loose soil is greatly improved, and the sliding problem of a traditional anchor rod is solved; in the second stage, axial tensioning and radial anchoring are cooperated, the anchoring effect is doubly strengthened, the characteristic that the rare earth ore soil body is low in shear strength is adapted, in the third stage, the auxiliary anchor rod permanently assists in anchoring, a multi-directional reinforcing system is formed, and the extreme instability scene can be effectively dealt with.