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

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 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 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 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.

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 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 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 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.

The application discloses a composite prevention and treatment structure for preventing soft soil and miscellaneous fill from interpenetrating and a construction method, and belongs to the technical field of foundation treatment. The structure is arranged between a soft soil layer and a miscellaneous fill layer and sequentially comprises, from bottom to top, a lower layer isolation unit composed of a geocell filled with granular materials and forming a flexible raft support, a microbial cementation unit including a three-dimensional microbial carrier layer and microbial mineralization products planted in the three-dimensional microbial carrier layer, and an upper layer constraint unit adopting a geogrid and a mechanical interlocking with the miscellaneous fill. Through the synergistic effect of physical isolation and biological cementation, the calcium carbonate crystals generated by MICP are used to block the interface micro-pores, and the macro-reinforcing function of the geosynthetic material is combined, so that the interface fine particle loss and interpenetration deformation problems are effectively solved. The application has the advantages of high shear strength, good reinforcement uniformity, green environmental protection, strong puncture resistance and the like, and can significantly improve the long-term stability of a complex foundation.

The invention relates to the technical field of geotechnical engineering and geological disaster prevention and control, and discloses a loess slope stability calculation method considering a stress state, and the method comprises the steps: building a slope three-dimensional model according to the landform, geologic structure and rock-soil body physical and mechanical parameters of a slope; applying a load in the side slope three-dimensional model and setting boundary conditions to obtain a stressed side slope three-dimensional model; carrying out stress field solving on the three-dimensional model of the stressed side slope to obtain a global stress field of the side slope; for each collected soil sample, extracting a corresponding stress tensor from the stressed slope three-dimensional model, and determining a confining pressure condition corresponding to an indoor shear strength test; according to the confining pressure condition, an indoor shear strength test is carried out, and a soil shear strength index under the actual stress field condition is obtained; a soil sample representative horizon method is adopted, the stratigraphic position corresponding to each soil sample is analyzed, the slope stability is calculated, and the slope safety coefficient and the potential sliding surface position are obtained. Therefore, the accuracy of slope stability analysis is improved.

The application discloses a method and device for determining an anti-overturning coefficient of a pit-in-pit double-row-pile supporting structure, and relates to the technical field of foundation pit engineering. The method comprises the following steps: determining a trapezoidal cross-section earth covering rupture angle and an earth covering rupture surface of a trapezoidal cross-section earth covering between a pit-in-pit structure and a double-row-pile supporting structure according to an internal friction angle of soil; determining an anti-sliding force of soil above the earth covering rupture surface according to the size of the trapezoidal cross-section earth covering between the pit-in-pit structure and the double-row-pile supporting structure, the trapezoidal cross-section earth covering rupture angle and the shear strength of the soil layer; and determining the anti-overturning coefficient according to the anti-sliding force of the soil above the earth covering rupture surface, the earth pressure outside and inside the foundation pit, the distance between the anti-sliding force action point and the bottom of the double-row-pile supporting structure and the self-weight of the double-row-pile and the soil between the piles. The method solves the problem that the embedded depth of the supporting structure is generally designed according to experience and is too conservative in the prior art, and the embedded depth of the supporting structure is too deep, which greatly increases the construction cost.

An integrated device for measuring expansive deformation-expansive force-shear strength of expansive soil belongs to the technical field of rock-soil mechanics tests and comprises a frame assembly, a force application assembly, a water bath assembly, a shear box assembly and a monitoring assembly. The force application assembly is arranged on the frame assembly; the water bath assembly is arranged in the frame assembly; the shear box assembly is arranged in the water bath assembly; the monitoring assembly is arranged on the frame assembly and the shear box assembly. According to the integrated device for measuring the expansive deformation-expansive force-shear strength of the expansive soil, disclosed by the invention, the shear strength can be directly measured after the expansive deformation or expansive force measurement is carried out on the same expansive soil sample, and the axial expansive force and the radial expansive force can be obtained after the expansive soil sample generates certain expansive deformation; accurate data support is provided for deep research of expansive force anisotropy of expansive soil, investment of samples, equipment and time cost is greatly reduced, and mechanical properties of expansive soil in nature can be reflected more truly.

The invention relates to a deep soil body lateral slippage resisting foundation pit slope supporting and reinforcing device which comprises a supporting unit, the supporting unit comprises a supporting plate and a fiber reinforced composite material reinforcing belt on the back face of the supporting plate, a fixing hole is horizontally formed in the bottom of the supporting unit in a penetrating mode, and a fixing rod is connected into the fixing hole and inserted into a foundation pit slope. A set of anchor cable holes are formed in the supporting unit above the fixing holes, an anchor cable array is fixed to the back face of the supporting unit, a horizontal guide rail is arranged on the back face of the supporting unit, an intelligent horizontal limiting stopper is installed on the horizontal guide rail, and two piston rods of the intelligent horizontal limiting stopper abut against the two adjacent fixing rods. The hydraulic system is automatically started for pushing compensation, the shearing strength of the deep soil body can be remarkably improved, and lateral sliding of the deep soil body is resisted.

The utility model provides an undisturbed soil sampling device for shear strength detection. The undisturbed soil sampling device comprises a drilling cylinder and an inner cylinder, the drilling cylinder is provided with a cylinder cavity with one open end, and a drilling tooth part is arranged at the open position of the drilling cylinder. The inner cylinder is arranged in the cylinder cavity, is coaxially and rotatably connected with the drilling cylinder, and is provided with a sample storage cavity communicated with the opening of the drilling cylinder; according to the undisturbed soil sampling device for detecting the shearing strength, provided by the utility model, the friction to the outer wall of a columnar soil sample can be reduced, so that the columnar soil sample entering the drill barrel is effectively prevented from being disintegrated and crushed, the probability of the sampling integrity of the undisturbed soil is improved, and the sampling effect is further ensured.

The present disclosure discloses a test method for reducing test error in shear strength of a root-soil composite, belonging to the field of agricultural engineering testing methods. The method includes: sampling with a ring knife perpendicular to an actual shear surface to ensure consistency between a direction of the actual shear surface of the root-soil composite and a shear surface direction in a direct shear test; determining a shear strength of soil in each layer within an actual shear depth range by stratifying with a minimum thickness of the ring knife; and planning an annular sampling area and performing sampling in various directions along the annular area, thereby reducing test error in determining shear characteristics of the root-soil composite from three aspects.

The invention relates to the technical field of slope engineering, and discloses a soil slope partition rainfall test device, a test box comprises a box body and a slope model, the slope model comprises a plurality of rainfall simulation areas, the bottom of a rain baffle is separated from the slope model, and a rainfall spraying mechanism comprises a water conveying pipe and a pressure nozzle. The rainfall simulation area located in the non-rainfall area is covered with a waterproof film, and a waterproof film is installed at the junction between the rainfall simulation area located in the non-rainfall area and the rainfall simulation area located in the rainfall area; the invention further discloses a test method of the soil slope partition rainfall test device. Test preparation; rainfall simulation: selecting a rainfall simulation area, covering a waterproof film and installing a rainproof plate; collecting data; according to the invention, the rainfall range of each region is effectively controlled, and precise simulation of local soil saturation, shear strength reduction and local failure mechanism of the slope under the rainfall condition is realized.

The present application relates to the field of foundation pit engineering construction, and particularly relates to a comprehensive detection and evaluation method for construction quality of a backfill area of a foundation pit, which introduces an undisturbed area as a comparison, and through the cooperative detection of multiple indexes of soil body settlement deformation, soil body shear strength, soil body specific gravity and soil body density, calculates the average difference rate, difference rate jump value and influence coefficient of the modified evaluation index and comprehensive evaluation index of multiple positions of the backfill area respectively, and finally constructs the comprehensive evaluation index to evaluate the construction quality of the backfill area. Through the multiple depth detection comparison, the change and influence degree of the backfill area construction on the original state of the soil body are accurately quantified, which can provide scientific and accurate basis for the quality control of the backfill of the foundation pit, fundamentally improves the quality control level of the foundation pit engineering, and effectively guarantees the long-term safe and stable operation of the subsequent engineering.

The invention discloses a slope disaster early warning method based on soil particle loss. The slope disaster early warning method comprises the following steps that a tamping modeling foundation is obtained through multi-dimensional data; carrying out seepage-stress coupling numerical simulation by utilizing simulation software, and calculating to obtain slope stability coefficients and potential instability ranges under different working conditions; constructing and training a neural network model with the capability of quickly predicting the stable state of the slope according to the input parameters; reversely deducing real-time slope shear strength parameters; and inputting the backstepping real-time slope shear strength parameter and the on-site rainfall into the trained neural network model, and outputting the stability coefficient and the potential instability range of the current slope by the model. The method has the beneficial effects that a tamping modeling basis is obtained through multi-dimensional data according to the whole process logic of data acquisition, numerical simulation, intelligent modeling, field monitoring and dynamic early warning, rich and accurate data support is provided for subsequent links, and scientificity and reliability of an early warning model are ensured.

This invention discloses a method for preloading soil and controlling the stability of dikes in soft soil foundations during land reclamation, belonging to the field of soft soil foundation treatment technology. Addressing the technical problems of drainage boards easily twisting and breaking, poor reinforcement effects due to unloading rebound, and dike slope instability in newly reclaimed ultra-soft soil foundations, the method includes: sequentially performing a first vacuum preloading followed by staged soil surcharge preloading to control settlement and displacement rates; stopping the vacuum and removing all soil surcharge after the consolidation degree meets the standard; installing a second set of drainage boards on the unloaded foundation surface, arranged in a staggered pattern with the first set; repaving the drainage system and initiating a second vacuum preloading without soil surcharge until the settlement rate, consolidation degree, and vane shear strength meet design requirements. This invention eliminates the uneven defects caused by drainage board failure during the first reinforcement through secondary reinforcement with inserting plates, effectively improving the overall shear strength and stability of the foundation. It is mainly used for deep reinforcement of soft soil foundations during land reclamation and for dike slope stability control.

The application discloses a ship lock foundation pit confined water control method and device based on soil body shearing strength, and relates to the technical field of ship lock engineering, wherein the method comprises the following steps: calculating the confined water head, the overlying impermeable layer thickness and the initial gushing safety coefficient according to the geological survey data and the foundation pit excavation bottom surface elevation; calculating the soil body shearing strength based on the pre-acquired cohesion and internal friction angle of the overlying impermeable layer soil body; and further calculating the corrected gushing stability safety coefficient. When the corrected gushing stability safety coefficient is less than the preset gushing stability threshold, it is determined that the ship lock foundation pit engineering does not meet the gushing stability requirement, the impermeable layer soil body reinforcement construction parameter is determined, and after construction is performed according to the impermeable layer soil body reinforcement construction parameter, the ship lock foundation pit is subjected to permeation inspection. The application solves the technical problem of high cost of the water interception curtain scheme or the deployment of the water pumping well scheme used by the ship lock foundation pit engineering in response to the imbalance of the confined water in the related art.

The application discloses a kind of soil shear strength calculation method and device based on particle internal normal stiffness, method mainly includes: obtaining different particle normal contact stiffness corresponding shear strength parameter, obtain multiple data pairs, fitting to multiple data pairs, obtain the relationship curve of soil internal particle normal contact stiffness and shear strength parameter;The axial stress of the soil particle to be measured is obtained, the normal contact stiffness of the particle is determined, and the shear strength parameter of the soil to be measured is obtained according to the relationship curve of the soil internal particle normal contact stiffness and the shear strength parameter.The application can break through the limitation of conventional indoor soil test and soil mechanics macroscopic phenomenological research, and quickly and accurately calculate the loess shear strength parameter, to provide accurate and reliable data parameters for highway engineering high slope stability calculation.