12 results about "Limit equilibrium method" patented technology

The present application relates to the technical field of geotechnical slope safety, and particularly relates to a soft interlayer-containing bedding slope displacement dynamic safety early warning method and system based on time sequence LSTM. By constructing the step-by-step excavation process of the slope as a time sequence and introducing a long short-term memory neural network model capable of effectively learning long-term dependencies, the accurate simulation of the displacement dynamic cumulative response of the soft interlayer-containing bedding slope during the excavation process is realized. The method effectively overcomes the shortcomings of the existing technology, such as the inability of the limit equilibrium method to reflect time sequence effects, the low calculation efficiency and difficulty in real-time application of the numerical simulation method, and the inability of the static machine learning model to capture the step-by-step excavation path dependence characteristics. The advantage lies in short calculation time, fast iteration speed, and the ability to realize real-time and dynamic prediction of the displacement at each step during the excavation process, thereby providing timely and reliable technical support for slope safety management and risk early warning decision-making during engineering construction, greatly improving the timeliness and accuracy of early warning.

This invention relates to the field of geotechnical engineering monitoring and slope stability analysis technology, specifically to a method and system for the layout of slope monitoring points throughout the entire construction and operation cycle. The method acquires multi-source monitoring data and constructs a unified data warehouse through cleaning, format conversion, and spatiotemporal registration. Based on this unified data warehouse, a dynamic risk assessment model coupled with the limit equilibrium method and the finite element method is used to identify target risk areas, and key monitoring variables are identified through global sensitivity analysis. Finally, a multi-objective optimization algorithm is used to solve for the Pareto optimal solution set to determine the location and density of monitoring points. This invention achieves adaptive matching of the monitoring network to changes in geological conditions and dynamic engineering needs throughout the entire cycle, improving the targeting of monitoring and the efficiency of resource allocation.

The application discloses a kind of V-shaped slope stability calculation method and system, it is related to strip mining technical field.Based on three-dimensional numerical simulation technology, determine its failure mode first determine the spatial form equation of potential sliding body, then the sliding body is divided into regional division micro column, through constitutive relation and static equilibrium condition, the stress state of micro column is solved, the force of each row micro column is superposed along the direction of main sliding surface, and the two-dimensional equivalent shear strength parameters with three-dimensional effect on each row of main sliding surface micro column are obtained using equivalent idea, then the three-dimensional V-shaped slope stability coefficient is derived using rigid body limit equilibrium method.The application avoids the problems of high calculation cost, difficult parameter determination and complex calculation process in the traditional three-dimensional slope stability calculation method, solves the three-dimensional stability problem of this special form slope, provides more reliable theory and technology for the design, mining, prevention and management of slope, and has important practical significance for ensuring mining safety and efficient production.

The application discloses a method for automatically searching and evaluating stability of key dangerous blocks in a hydraulic tunnel, which comprises the following steps: constructing a three-dimensional model of the tunnel and automatically identifying all blocks based on a spatial topology algorithm; calculating the safety factor of the blocks by using a rigid body limit equilibrium method, and determining the blocks below a threshold value as dangerous blocks; supporting the exposed excavation surface of the dangerous blocks, calculating the safety factor after supporting, and comparing the safety factor with the threshold value; if the safety factor after supporting is still below the threshold value, adjusting the number of supporting points and repeating the calculation until the requirement is met; and finally outputting the block number, supporting parameters and sliding mode. The method can automatically identify dangerous blocks and optimize the supporting scheme, ensure that the stability of the reinforced blocks meets the requirements, and improve the intelligent level of the tunnel supporting design.

This application discloses a method and apparatus for evaluating the seismic stability of slopes with a binary stratigraphic structure, relating to the field of geotechnical engineering. A soil-rock differentiated constitutive model is established, and the spatiotemporal effects of seismic waves are simulated using simple harmonic waves. Dynamic response characteristics are calculated, and a logarithmic spiral slip surface is determined. The vertically segmented slip body is analyzed, and the inertial force resultant is obtained by integrating seismic acceleration. Using the limit equilibrium method, the slope seismic stability coefficient corresponding to the logarithmic spiral slip surface is solved. All potential slip surfaces within the slope are iteratively searched, and the slip surface corresponding to the smallest slope seismic stability coefficient is taken as the most dangerous slip surface. The displacement and acceleration dynamic response laws of the slip body under seismic loading are analyzed to form a comprehensive evaluation system. This method solves the problems of existing methods that still use a single viscoelastic constitutive model, failing to fully consider the differences in dynamic characteristics between soil and bedrock, failing to reflect the geometric boundary conditions of the slope model, and potentially overestimating seismic forces within the slope.

This invention discloses a method for back-analysis of shear strength parameters of soil in a homogeneous slope under sliding conditions, comprising: collecting crack information of the slope body under sliding conditions and determining the slope safety factor; determining the value range of the shear strength parameters to be inverted; determining the direction and location of cracks and selecting multiple two-dimensional calculation sections of the slope body under sliding conditions; using the geometric coordinate position of the two-dimensional calculation sections at the cracks and the slope safety factor as search constraints, and using the circular arc slip surface search to obtain the potential most dangerous slip surface and the combination of shear strength parameters; and using statistical methods to analyze the combination of shear strength parameters of the potential most dangerous slip surface to obtain the equivalent shear strength parameter combination that satisfies the slope body. This invention can improve the accuracy and reliability of slip surface construction, making the shear strength parameters closer to the actual slope condition, and can also objectively determine the unique or most reasonable equivalent shear strength parameter combination, solving the problem that the solution of shear strength parameters is not unique in the traditional limit equilibrium method back analysis.

The application discloses a dam slope stability analysis method for a dam slope caused by a fault, and specifically relates to the following steps: according to the form of the dam body and the fault position, a fault position for analysis is determined on the dam slope; the maximum vertical dislocation amount and the maximum horizontal variation amount of the fault are obtained from existing geological data, and the settlement of the downstream dam slope at the fault position is determined according to the maximum vertical dislocation amount; the dry bulk density and the saturated bulk density of the dam body material are obtained through a density test in a dam material test, and the Φ0 and the △Φ are obtained through a large triaxial test; the shear strength of the dam body material is reduced in the range of the maximum horizontal variation amount at the determined fault position; the dam slope stability at the determined fault position is calculated; and the dam slope stability at the fault position is evaluated according to the calculation result. The method solves the problem that the existing method cannot quickly and preliminarily determine whether the dam slope is stable when the dam body is caused to fault.

The application provides an ice-water accumulation body bank collapse prediction method based on the limit equilibrium method, relates to the technical field of reservoir safety, and obtains a complete topographic profile by topographic surveying on an ice-water accumulation body slope, constructs an MP model in combination with the mechanical parameters of the ice-water accumulation body slope, analyzes the stability of the ice-water accumulation body slope in the MP model by the limit equilibrium method, obtains an analysis result, and if the part with the stability less than 1 in the analysis result is located on water, the part with the stability less than 1 located on water is accumulated under water according to the underwater stability slope angle, bank collapse is simulated, a new topographic profile is obtained, the MP model is reconstructed, iteration is carried out, until the ice-water accumulation body slope cannot collapse, the overall width of the part with the stability less than 1 located on water is counted as the predicted bank collapse width, the problem that the existing ice-water accumulation body bank collapse prediction error is large is solved, and the application is suitable for ice-water accumulation body bank collapse prediction.

This invention relates to the field of geotechnical engineering and geological disaster prevention technology, and provides a method for slope landslide risk identification and stability evaluation considering the coupling effect of excavation and rainfall infiltration. The method includes the following steps: inputting geological survey data; establishing a geometric model and material zoning; determining unsaturated hydraulic parameters; performing steady-state seepage analysis to establish a steady-state initial field; performing unsteady-state infiltration analysis; calculating / correcting unsaturated shear strength parameters; conducting limit equilibrium method (LEM) and strength reduction method (SSR) analyses in parallel; extracting the most unfavorable slip surface; comparing and verifying the consistency of the LEM slip surface and the SSR slip surface, and outputting the slope risk level and early warning suggestions based on the verified results. This scheme achieves reliable identification of the instability moment, the most unfavorable slip surface, and the contribution of excavation / rainfall through the above method. It can be directly applied to slope risk classification and early warning, significantly improving the engineering applicability of the research results, and has advantages such as wide applicability and ease of engineering integration.

The present application relates to the field of geological disaster monitoring and warning and geotechnical engineering informatization, and discloses a kind of satellite InSAR and ground displacement joint restraint's slope digital twinborn self-update and early warning method, solve the existing slope monitoring technology There are problems such as difficult multi-source data fusion, stability analysis cannot dynamically update parameters and sliding surface geometry, lack of digital twinborn model self-update capability and single early warning index.The present application fuses satellite InSAR surface deformation, ground GNSS point deformation, deep profile deformation data under unified space-time and coordinate datum, realizes the real-time self-update of model by constructing twinborn model augmented state containing geotechnical parameters and sliding surface geometric parameters, combined with hierarchical consistency constraint objective function, then fuses static stability index of limit equilibrium method and dynamic deformation index of proxy model, forms comprehensive hierarchical early warning system considering static stability and dynamic deformation characteristics of slope.

The present application relates to the technical field of geotechnical slope safety, and particularly relates to a soft interlayer-containing bedding slope displacement dynamic safety early warning method and system based on time sequence LSTM. By constructing the step-by-step excavation process of the slope as a time sequence and introducing a long short-term memory neural network model capable of effectively learning long-term dependencies, the accurate simulation of the displacement dynamic cumulative response of the soft interlayer-containing bedding slope during the excavation process is realized. The method effectively overcomes the shortcomings of the existing technology, such as the inability of the limit equilibrium method to reflect time sequence effects, the low calculation efficiency and difficulty in real-time application of the numerical simulation method, and the inability of the static machine learning model to capture the step-by-step excavation path dependence characteristics. The advantage lies in short calculation time, fast iteration speed, and the ability to realize real-time and dynamic prediction of the displacement at each step during the excavation process, thereby providing timely and reliable technical support for slope safety management and risk early warning decision-making during engineering construction, greatly improving the timeliness and accuracy of early warning.

This invention discloses a method for calculating the slope stability safety factor that integrates the finite element method and the limit equilibrium method, comprising the following steps: 1) providing the results of the finite element calculation of unsaturated seepage stress coupled with the slope, and extracting the effective stress of each element node; 2) obtaining the set of line segments intersecting the slip zone and the finite element mesh, and establishing an index pattern between the line segment set and the finite element mesh; 3) solving for the normal force and shear force on each line segment set by integrating along the slip zone path; 4) calculating the total anti-sliding force and total sliding force on the slip zone; 5) calculating the stability safety factor. This invention combines the advantages of the seepage stress coupled finite element method and the limit equilibrium method, and uses an accurate integration method along the path to achieve accurate calculation of the sliding force and anti-sliding force of the slip surface. The physical meaning is clear, the derivation is rigorous, and the calculation results are reliable, which helps to reasonably evaluate the slope stability variation law under the coupling of multiple factors and multiple physical fields.