180 results about "Slope stability analysis" patented technology

The invention relates to the technical field of mining safe engineering, and particularly to a stability monitoring method for a cold high-altitude steep slope. According to the stability monitoring method, through field engineering geology, hydrogeology survey, engineering geological rock quality evaluation and rock mechanical parameter determining, the lithologic condition, the rock structure, the hydrogeology condition, the slope shape, earthquake parameters, explosion parameters and the like of the slope are determined. Slope stability analysis and a treatment strategy measure are performed. Furthermore a comprehensive monitoring system and a slope instability criterion are established.

The present invention discloses a soil slope stability analysis method based on limit equilibrium theory and stress analysis, wherein the method comprises the following steps: 1) respectively preinstalling two slip surface starting points on the slope base and the next-to-top position of slope; 2) preinstalling a plurality of slip surface starting points on natural interface of slope between the two slip surface starting points; 3) setting the preinstalled safety factor corresponding with each slip surface starting point, and calculating out the critical slip surface corresponding to each slip surface starting point through calculating the found preinstalled safety factor satisfying the condition; and 4) selecting the critical slip surface with least preinstalled safety factor as the critical slip surface of whole soil slope, wherein the least preinstalled safety factor is used as the stability safety factor of whole slope. The soil slope stability analysis method of the invention has the following beneficial effects: (1) no requirement for pre-supposing the shape or position of slip surface, and only requirement for supposing the starting point position of slip surface (namely the position of so-called slip surface shear crack); and (2) translation of problem for searching the critical slip surface to the problem for searching the position of critical shear crack, and overcoming the problems of leaked solution or a plurality of solutions in the traditional method.

The invention discloses a slope stability analysis slice method based on global optimization and belongs to the field of slope stability analysis. The method includes that a slope slip mass is divided into vertical strip blocks or inclined strip blocks, acting force (including normal force and shearing force) on the bottom faces of the strip blocks and acting force (including normal force and shearing force) between the strip blocks are utilized as unknown variables, stable safety coefficient of the slope is utilized as a target function, and a balance equation of the strip blocks, the yield condition of the bottom slip face of the strips blocks, the yield condition of contact face between the strip blocks and other constraint conditions are combined to build a nonlinear mathematical planning model for slope stability analysis, and an optimization algorithm is utilized to solve the global optimum maximum stable safety coefficient. By means of the method, the performance that the slope safety coefficient has a floor solution can be achieved. The method has the advantages of being clear in conception, high in calculation accuracy and the like and can be applied to stability analysis of soil slopes or rock slopes.

The invention discloses a generalized impedance criterion calculation method for stability analysis of a grid-connected inverter and an application. The method comprises the following steps of building a small signal impedance model of an inverter side network port and a small signal impedance model of a power grid side network port under polar coordinates; and calculating generalized impedances of the inverter side network port and the power grid side network port according to the built small signal impedance model of the inverter side network port and small signal impedance model of the power grid side network port under the polar coordinates, and dividing the two generalized impedances obtained in the second step to obtain the ratio of the generalized impedances of the inverter side network port and the power grid side network port as a generalized impedance criterion. The obtained generalized impedance criterion can be used for small signal stability analysis of a grid-connected inverter system, the problem that the analysis accuracy is affected by a traditional impedance method due to the presence of coupling is solved, a foundation is laid for clearing power grid oscillation generated when new energy is connected to a power grid on a large scale, and the method disclosed by the invention is an important method for designing an inverter controller to improve the stability.

The invention relates to a landslide space-time prediction method. A landslide catastrophe process of a research position is subjected to space-time prediction by combining a physical conception-based hydrological model and a Bishop slope stability analysis method, and the landslide space-time prediction method is a landslide prewarning and forecasting method which combines soil mechanics, hydraulics and computer numerical simulation. The landslide prediction method has the advantages that a landslide deterministic model and the physical conception-based hydrological model are integrated effectively, the space-time distribution laws of the basin slope stability under the action of rainfall and the qualitative and quantitative relationship of the space-time distribution laws are analyzed, and the basin landslide is analyzed and predicted rapidly and effectively. By adopting the Bishop slope stability analysis method and simultaneously considering the spatial distribution difference in water content of soil mass, the precision and the applicability of the model are improved. The landslide prediction method provided by the invention is suitable for the landslide prediction of a simple side slope, a complex side slope and a basin scale.

The invention relates to a technology for testing rock mass mechanics parameters, in particular to a method for testing rock mass mechanics parameters based on an explosion seismic wave space-time attenuation law. The method comprises the steps of data testing and test data processing; and geometric parameters and mechanics parameters of rock mass can be obtained by corresponding testing and calculating. The parameters mainly comprise the viscosity coefficient of the rock mass, the equivalent elastic modulus of the rock mass, an azimuth angle of a structural plane, the rigidity of the structural plane, the thickness of the structural plane, and the elastic modulus of the structure plane; and the relevant parameters of the rock mass are given for analysis of slope stability.

The invention belongs to the field of operation and control of electric power systems and provides an N-2 combined fault quick sequencing method for transient stability analysis of an electric power system, which is used for sequencing arbitrarily combined N-2 fault of an electric power system according to the severity of the transient stability. Based on the quantized evaluation information of the transient stability of the N-1 fault, the method calculates the severity index of the transient stability of the N-2 combined fault by combining the information of the power sensitivity of the powerchange of a second switching element on the transient stability critical generator group of the first fault element, thereby sequencing the N-2 combined fault set of the transient stability analysisof the electric power system. The method can be used for sequencing a large quantity of N-2 combine faults according to the severity of the transient stability when the operation mode, the model and the parameters of the power network are determined, so as to only calculate and analyze the transient stability of a small quantity of N-2 combined faults ranking at the front in detail and greatly enhance the efficiency of detailed calculation and analysis on transient stability of any N-2 combined fault.

The invention relates to a calculation method for ultimate bearing capacities of rock slopes with rock bridges, and belongs to the field of rock slope stability analysis. The method comprises the following steps of: dispersing a rock slope with rock bridges by adoption of a composite element method on the basis of a theory of the plastic ultimate analysis lower limit method; establishing a nonlinear mathematic programming model for stability analysis of rock slopes with rock bridges by taking an ultimate load and a strength reserve coefficient of the rock slope as target functions; and solving maximum values of the ultimate load and the strength reserve coefficient by using a mathematic programming optimization algorithm. According to the method provided by the invention, the plastic ultimate analysis lower limit method, a composite element method dispersion technology and a mathematic programming measure are combined to establish a rock slope ultimate bearing capacity solution method which not only can simulate the continuous media characteristics of the rock bridges, but also can simulate the non-continuous media characteristics of rock blocks. The method provided by the invention has the characteristics of being clear in concept and high in calculation precision, and can be applied to the analysis of bearing capacities of the rock bridges in rock slopes.

The invention relates to a lower-bound limit analysis method of bearing capacity considering rock translation and rotation effects at the same time, and belongs to the technical field of rock slope stability analysis. According to the method, a rigid block unit is scattered as a geometry system of a rigid rock and a structural plane, the normal force, shearing force and bending moment of the structural plane are used as unknown quantities, a static permission stress field satisfying an equilibrium equation considering the translation and rotation effects of the rigid block unit, structural plane shear yield conditions, structural plane tensile yield conditions, structural plane rotational yield conditions and static boundary conditions is constructed, an overload coefficient is used as a target function, and a lower-bound linear mathematic programming model is built; the linear mathematic programming model is solved by means of an interior point algorithm, a strength reserve coefficient is solved by means of an iterative method at the same time, and the lower-bound solution and corresponding yield area of the overload coefficient or the strength reserve coefficient of the jointed rock slope are acquired. The method has the advantages that the concept is clear and the computational accuracy is high, and the method can be applicable to bearing capacity analysis of translational or rotational failure of the jointed rock slope.

The invention provides an analysis method of ultimate toppling failure bearing capacity of a jointed rock slope under the action of seismic force, and belongs to the technical field of rock slope stability analysis. According to the method, the jointed rock slope is used as a research object to calculate horizontal or vertical seismic inertial force of rock centroids according to a principle of a pseudo-static method, that is, the seismic inertial force is a function of slope height, rock centroid height and seismic parameters; normal force, shear force and bending moments of internal force of structural surfaces of rocks are used as unknown quantities to establish force and moment balance equations of the rocks; at the same time, yield conditions of toppling failure of the rocks, shear slips of the structural surfaces and tensile detachment are established, overload coefficients of external loads are combined, and a linear mathematical programming model of the lower-bound method of the ultimate bearing capacity of the jointed rock slope on which the toppling failure occurs under the action of seism is established; and finally, a simplex method is adopted to solve ultimate status of the toppling failure of the slope, and an ultimate load or strength reserve coefficient corresponding to a toppling failure mode can be obtained.

The invention discloses a slide face boundary method for calculating the slope stability. In the slide face boundary method, only a slider is taken as a calculated object for slope stability analysis. The invention further discloses a comprehensive glide force-antislide force stability coefficient calculation method and a main glide force method based on the slide face boundary method. The method disclosed by the invention has the advantages that the non-convergence problem of an existing slope stability calculation method is solved, the slope step-by-step stability failure analysis, realizes easy calculation can be implemented, the calculation results with a conventional limited equilibrium slice method can be compared, and new stability coefficients have different physical significances, so that the current slope monitoring results can be applied to the slope stability evaluation.

The invention relates to field of engineering geological exploration analysis and discloses a rock block stability fast evaluation method based on a three-dimensional outdoor scene and stereographic projection. According to the rock block stability fast evaluation method based on the three-dimensional outdoor scene and the stereographic projection, geological investigation personnel versatilely analyze blocks likely to slip conveniently and rapidly in the field environment, visually make an evaluation for a side slope stability state, and qualitatively analyze the stability situation after personnel excavate the side slope at the same time. The method comprises the steps of 1, collecting rock mass structure geological data information in an engineering area; 2, introducing the geological data information to a three-dimensional outdoor scene platform to form three-dimensional terrain; 3, determining a natural rock side slope to be analyzed; 4, in the range of the natural side slope, screening out all structural plane data information; 5, cutting blocks in the three-dimensional outdoor scene platform; 6, generating a side slope stability analysis report according to a polar stereographic projection method; 7, according to a construction scheme, inputting artificial side slope data; 8, according to the polar stereographic projection method, natural side slope data and artificial side slope data, generating a stability report.

The invention discloses a large photovoltaic power station on-line equivalence modeling method suitable for safety and stability analysis, and belongs to the technical field of electric power systems and automation thereof. The large photovoltaic power station on-line equivalence modeling method comprises the following steps of matching parameter sensitivity of photovoltaic inverters and a reference response curve of systems in an on-line manner through actual measurement information on the basis of an inverter parameter sensitivity matrix and reference response curved line gather which is established in an off-line manner; calculating clustering indexes of the inverters and clustering and grouping the inverters by using the inverters as gathered objects; and performing on-line dynamic equivalence on a large photovoltaic power station according to the inverters on the premise that requirements on the safety and stability analysis and simulation precision are met. By performing on-line equivalence modeling on the large photovoltaic power station, a reliable photovoltaic power station simulated model can be provided, the complexity of the large photovoltaic power station model can be reduced, so that the calculated amount of safety and stability analysis on a power grid is effectively reduced, and the on-line safety and stability analysis, early warning and controlling decision-making level is improved.

The invention belongs to the technical field of slope stability measurement and discloses a rock high slope stability analysis three-dimensional geomechanical model test method and the application thereof. The stability of the rock high slope is evaluated through a geomechanical model test method based on temperature rise, intensity reduction and lifting overload. The disclosed method comprises the whole test process, namely, the process of model design, model material test, model manufacturing, measurement system installation and model test. According to the method, the slope deformation distribution characteristics, the damage process and the damage mechanism can be obtained, the overall stability safety coefficient of the slope is obtained. Therefore, the overall stability of the high slope is evaluated. Finally, the method is applied to stability research of the high slope of the left bank dam abutment of the crane beach hydropower station. The initial cracking safety coefficient Kof the high slope is obtained. The initial cracking safety coefficient K ranges from 1.030 to 1.058. The limit safety factor k limit is equal to 1.417-1.579, and the overall stability of the slope isevaluated.

The invention discloses a rock mass slope stability analyzing method based on video detection, which is characterized by comprising the steps of: shooting a slide slope drilling hole by a fisheye camera, setting a depth value of the fisheye camera in a computer; computing and processing a fisheye picture shot by the fisheye camera by the computer, restoring the fisheye picture in an actual drilling hole columnar picture; unfolding the columnar picture into a plane picture, sequentially splicing the columnar picture to obtain a full view unfolding picture of the whole side slope drilling hole;and scanning the whole unfolding picture, obtaining joint parameters by applying a space analytic geometry algorithm, and restoring the full view unfolding picture into a full view columnar picture with the joint parameters. The rock mass slope stability analyzing method can be used for judging and computing the side slope drilling hole integrally through a video detection device and a computer computing and processing system, and can be operated by a working personnel only needing being subjected to basic training so that a side slope is stably detected.

The invention discloses a rapid screening method of expected failure sets in electric power system transient stability assessment, and belongs to the technical field of an electric power system and the automation thereof. The rapid screening method is based on an extended equal-area criterion (EEAC), adopts a researched calculation example time-varying degree and the transient stability margin, which are reflected by transient stability analysis algorithms with different simplification degrees, as indexes, and combines researched calculation example failure information so as to match and combine into different screening criteria. Expected failure subsets satisfying the screening criteria are screened out in a layered mode from an expected failure universal set, thereby greatly reducing the number of expected failures requiring detailed transient stability analysis. The rapid screening method disclosed by the invention can improve the rapidity of the transient stability assessment under the premise of guaranteeing the accuracy of the transient stability assessment, thereby appropriately coordinating the accuracy and the speed of the transient stability assessment.

Embodiments of the invention provide a fuzzy classification technology-based slope reliability parameter obtaining method and apparatus, and belong to the field of data processing. The method comprises the steps of generating k training sample vectors through an orthogonal design method according to mean values and standard deviations corresponding to m uncertainty parameters respectively; according to the k training sample vectors and one or more deterministic parameter values, obtaining slope stability coefficients corresponding to the k training sample vectors through a slope stability analysis method; by taking the k training sample vectors as independent variables and taking the slope stability coefficients corresponding to the k training sample vectors as dependent variables, forming a mapping relationship, and obtaining a mapping relationship expression through a support vector machine algorithm; and according to randomly generated N to-be-tested sample vectors obeying joint probability distribution, the mapping relationship expression and a preset instability state fuzzy judgment function, obtaining slope reliability parameters. The slope stability is quantized through the instability state fuzzy judgment function, so that the accuracy of the slope reliability parameters is improved.

The invention belongs to the technical field of electric systems. In order to solve the problem of low stability analysis computing efficiency of the original time delay electric system, effectively reduce the dimensionality of a time delay differential equation and achieve higher computing efficiency, the invention adopts a technical scheme that a Lyapunov stability analysis method of a time delay electric system comprises the following steps of establishing a constraint time delay differential equation (CTODE) model of the electric system, rearranging and reorganizing system states in a manner that the states (z1 to z) not considering time delay influence are at the front and the states (z2 to z) considering the time delay influence are at the back, obtaining a CTODE model corresponding to the original time delay system, and basing on a new stability criterion of the CTODE model. The method is mainly applied to the electric system.

The invention belongs to the technical field of slope stability analysis software development and relates to a method for developing slope stability reliability analysis software under spatial variation characteristics. The method comprises the steps of on the basis of preprocessed data input, performing slope discretization and integration analysis to obtain a safety coefficient of a specific instability mode; performing a certain number of times of minimum safety coefficient search and determining main instability areas; finally realizing slope stability reliability analysis software development based on multiple main instability modes through the Monte Carlo sampling method. The method gives full consideration to system features brought by the spatial variation characteristics of soil mass materials, fills up the blank of system feature calculation caused by spatial variation characteristics in conventional commercial software, and has a high engineering application value and a good commercial prospect.

The invention provides a slope stability discrimination method based on a surface water and groundwater coupling model, which comprises the following steps of establishing a slope internal water leveldetermination model, and simulating a water level change process in a slope according to surface water level observation data information and the surface water and groundwater coupling model; analyzing the actual water level in the local slope through the water content monitoring data in the local slope and a VG function, and comparing the actual water level with a simulation result for correction; and establishing a slope stability analysis model based on the obtained internal water level of the slope, finding out a most dangerous landslide surface by utilizing an intelligent algorithm and asimplified graduation method, obtaining a minimum stability coefficient of the slope, and judging the stability of the slope. According to the present invention, the change process of the water levelin the side slope can be simulated according to the observation data of the surface water level and the water content in the side slope, and then the side slope stability is evaluated; the most dangerous sliding surface is accurately found out through the iterative computation of an intelligent algorithm, the slope instability time and the instability area are predicted, and the landslide disasters are predicted.

The invention discloses an operation ticket security check method based on disturbance evaluation and trend analysis. The method comprises the following steps of (1) counting data; (2) performing calculation of trend and stability check; (3) performing disturbance evaluation on power grid scheduling operation; (4) analyzing stability trend before and after operation; and (5) giving an operation ticket security check conclusion and displaying. Due to the adoption of the method, the comprehensive security and stability analysis of a power grid scheduling operation ticket is realized, the influence of scheduling operation disturbance on power grid security is evaluated, the variation trend of the power grid security and stability levels before and after operation is analyzed, the technical support of security and stability analysis of the operation ticket is provided for scheduling operation personnel, and the security and stability levels of a power grid are raised.

The invention discloses a method for computing an optimal anchoring angle of a rock slope wedge, and belongs to the technical field of analyzing the stability of a rock slope and strengthening the rock slope. A security coefficient of the wedge-shaped slope serves as an objective function, the angle and the direction of anchoring force serve as optimization variables, constraint conditions such as the balance equation of the wedge, the yield condition of a structural surface and the boundary condition are combined, and the method which is used for computing the optimal anchoring angle of the wedge and can maximize the security coefficient is provided. The computing method can compute and obtain the optimal anchoring angle of the wedge accurately, easily and conveniently, has the advantages of being clear in concept, high in computing accuracy and the like, and brings convenience for engineering technicians to carry out optimal design for strengthening the wedge so as to achieve the purpose of being safe and economical.

The invention relates to an earthquake slope stability analysis method considering sliding surface dynamic progressive damage, and belongs to the technical field of slope stability. The method includes: based on the slope sliding surface damage evolution rule under the earthquake effect, obtaining strength parameter characteristics and a dynamic attenuation law of the slope geotechnical material by adopting a mechanical test; constructing a characterization material strength parameter attenuation strain softening model and a fracture surface vibration degradation model; based on a dichotomy strength reduction method and a maximum shear strain increment, determining a critical state sliding surface position under a slope static force state; furthermore, by combining a sliding surface dynamic progressive failure theory and a vector sum method, an earthquake side slope safety factor time-history curve is solved in numerical calculation, the stability state of the side slope under the earthquake action is truly reflected, and the accuracy and reliability of a numerical calculation result are improved.

The invention discloses a prediction method of considering the slope stability under the pore water effect. The prediction method comprises the following steps of step 1, selecting a slope to be predicted, determining the section geometrical size of the slope, and expressing the surface geometrical shape and the sliding face shape of the slope with an equation; step 2, determining slope soil parameters; step 3, applying a variational method to establish a slope stability analysis equation set under the effect of a pore water pressure, solving the equation set to obtain a slope sliding face stress distribution condition, and determining a safety coefficient and a most dangerous sliding face; and step 4, judging the slope stability according to a stability coefficient critical value. The invention gives a slope stability calculation method of considering the pore water effect, can perform calculation to acquire a minimal safety coefficient of the slope and the corresponding most dangerous sliding face, can give a soil cracking position and depth range caused by the effect of the pore water pressure, is high in calculation efficiency and accuracy, is more close to engineering practiceand provides important guidance to practical slope engineering landslide early warning and reinforcing design.

The invention discloses a loess high slope stability analysis method suitable for the rainfall condition. According to the loess high slope stability analysis method, based on the Sweden slice method, the situation that a sliding surface passes a back edge fracture end point and the position of 1 / 3 h of a slope surface is assumed, and meanwhile, the influence of rainfall weight increment and loess water content change on the loess slope stability is considered. The loess high slope stability analysis method comprises the basic steps that 1, the loess c (w) and phi values are measured; 2, the depth of a back edge fracture is calculated; 3, the circle center range of an arc failure surface is determined; 4, circle centers and loess bodies separated in a striped mode are selected; 5, the rainfall weight increment coefficient Ki is calculated; 6, the safety coefficient is calculated; 7, the different circle centers are selected by returning to the step 4 till the minimum safety coefficient is calculated; and 8, the water content value is changed, the step 4 is returned, and the minimum safety coefficients under different water contents are calculated. The loess high slope stability analysis method suitable for the rainfall condition is simple and practical, the related calculating parameters are clear in significance and easy to acquire, the problem of the stability estimation of a loess high slope can be effectively solved, and accordingly corresponding geological disaster hidden dangers are eliminated.

The invention discloses a method for stability analysis of reference point for GNSS automatic deformation monitoring, which comprises the following steps: calculating the GNSS observation data to obtain the coordinate residual time series of the reference point; detecting and removing rough errors in the coordinate residual time series of the reference point; extracting and removing the linear trend and the cyclical term in the series; conducting interpolation to the time series if there exist missing data in the coordinate residual time series after the removal of the trend and the cyclical term; extracting the common-mode error of the residual time series and removing the common-mode error from each residual series; and finally, using a quantification calculating method to determine whether the remaining residual series follows a normal distribution or not. If it is, then the reference point is regarded as stable; otherwise, instable. According to the invention, it can effectively eliminate the common error of a station, improve the signal-to-noise ratio of the coordinate time series, and finally make the main error of the coordinate time series of the station limited to observed random noise to judge whether the station is stable or not.

The invention discloses an impact type water turbine regulating system for electric power system stability analysis. The system comprises a regulator model, a spray needle servo system model, a deflector servo system model and an impact type water turbine model, wherein a signal input end of the regulator model inputs electric generator frequency and electric generator electromagnetic power; signal input ends of the spray needle servo system model and the deflector servo system model are connected with signal output ends of the regulator model; a signal input end of the impact type water turbine model is connected with signal output ends of the spray needle servo system model and the deflector servo system model; the regulator model calculates output of the regulator model according to input set frequency signals; the spray needle servo system model calculates opening degree output of a spray needle according to input of the regulator model; the deflector servo system model calculates opening degree output of a deflector model according to the set frequency signals; and the impact type water turbine model calculates mechanical power output of the impact type water turbine model according to opening degree input of the spray needle and opening degree input of a deflector. The system is exquisite and distinct in structure, well-defined and available in model parameter, fast, efficient and accurate in modeling process and high in practicability.

The invention belongs to the technical field of power system computation and analysis and is applied to generating a typical fault set for transient stability analysis of a power system. The method comprises the following steps of: firstly, for the same power grid operation mode, performing the transient stability evaluation on different faults respectively by adopting a transient stability quantitative evaluation method to obtain a stability mode of each fault; secondly, calculating a transient stability association degree index between different faults according to a constitutive relation between the participation factor of the same generators in the transient stability critical generator set of every two faults and the participation factor of all the generators in the critical generator set; and finally, screening all the faults according to the transient stability association degree index between the faults. Therefore, the typical fault set for the transient stability analysis of the power system is obtained.

The embodiment of the invention provides a method and device for obtaining a reliability parameter of a slope based on the parallel Monte Carlo method, and belongs to the field of data processing. The method includes the steps that according to the mean value and standard deviation corresponding to m uncertainty parameters, and k training sample vectors are generated through the orthogonal design method; according to the k training sample vectors and one or more certainty parameters, slope safe factors corresponding to the k training sample vectors are obtained through the slope stability analysis method; the k training sample vectors are used as independent variables, the slope safe factors corresponding to the k training sample vectors are used as dependent variables, a mapping relationship is constituted, and an expression of the mapping relationship is obtained through the support vector machine algorithm; N to-be-tested sample vectors whose distribution complies with the joint probability is randomly generated according to the parallel Monte Carlo method, and according to the expression of the mapping relationship, the slope reliability parameter is obtained through calculation. The method effectively improves the calculation efficiency and saves the time cost of slope reliability analysis.