Study On Slope Slip Surface Search Model Based On Spatial Displacement Field

Slope instability(slope)is one of the three major natural disasters,and the instability of slope often presents three-dimensional features.The form of the slip surface is also a complex space surface,so the three-dimensional stability analysis method is more suitable for the actual situation.The determination of potential slip surface in space is a worldwide problem,and the monitoring of long-term stability of three-dimensional slope is particularly important.In view of the above problems,this paper presents a threedimensional slope spatial slip surface search model based on displacement field,and discusses the principle and location of magnetic measurement of displacement inside the slope.(1)Based on the space displacement field of three-dimensional slope and MATLAB programming development software,a new sliding surface search method is established.The specific implementation methods are as follows:1)The finite element numerical analysis model of three-dimensional slope is established,and the element information and displacement field of the threedimensional slope model are obtained by numerical simulation.2)The data obtained by finite element calculation is imported into MATLAB,the mesh is re-divided,and a plurality of columnar three-dimensional space meshes are outlined in the three-dimensional coordinate system.3)In the self-built threedimensional mesh,the relationship between the old and the new elements is established,and the displacement values of the new elements are given by the spatial displacement interpolation algorithm.Then the element with the largest displacement in each column is found by comparison,which is the most dangerous element when the slope is destroyed.4)Extracting the spatial coordinates of the most dangerous unit in MATLAB,and the potential slip surface of three-dimensional slope can be fitted by programming.(2)Based on the basic principle of magnetic measurement and the search results of spatial slip surface,this paper presents a monitoring method for the internal displacement of slope and a layout scheme of measuring points.This scheme can realize the distributed and all-round monitoring of the internal displacement of slope,as well as the intelligent and dynamic monitoring of the internal deformation of three-dimensional slope.(3)Through the analysis of two examples of slope and foundation pit,the results obtained by the method described in this paper are compared with the results obtained by traditional analysis methods to verify the rationality and effectiveness of the search method.The search method proposed in this paper does not make assumptions about the shape and position of the slip surface,breaking the theoretical limit of the three-dimensional limit equilibrium method,and the calculation results are quite convincing.(4)Finally,two engineering examples are analyzed by the method described in this paper,which verifies the applicability of this method in practical engineering.