Application Of High Density Electrical Method And FLAC3D Numerical Simulation In Landslide Stability Analysis

With the development of tourism and urban and rural construction in remote mountainous areas,it is inevitable to build a road on the edge of a high and steep landslide in remote mountainous areas.Traditional drilling is difficult to carry out effectively in geological disaster exploration of high and steep landslides,while geophysical exploration means represented by high-density electrical method can effectively make up for the defects of traditional exploration means,which has the advantages of high work efficiency,low time cost and high detection accuracy.With the development of computer technology,the overall use of 3D visualization analysis software FLAC3 D,not only can effectively change state of landslide displacement and intuitive judgment,and must accurately grasp the overall failure mode and position of maximum shear strain appeared,provide necessary basis for project management.In this paper,through the combination of high-density electrical method and FLAC numerical simulation,the high-density electrical exploration provides the necessary model data for FLAC3 D numerical modeling,and the landslide stability analysis is carried out by using the built-in strength reduction method of FLAC3 D.The relevant conclusions are as follows:(1)in this paper,the forward model of "bar" low-resistivity anomaly and the forward model of "U" low-resistivity anomaly are established respectively.The inversion results of the strip-shaped low-resistivity anomaly model show that,under the same device condition,with the detection depth increasing,the resolution ability of the device to the buried depth,relative position,shape and other aspects of the lowresistivity geoelectric body is decreasing,and the response ability to the top and bottom interface is also decreasing.The inversion results of the u-shaped low-resistivity anomaly model show that,when the resistivity of the anomaly body is lower than the surface layer,it can be clearly identified in the inversion figure.When the resistivity of the anomalous body is larger than that of the surface layer,it is difficult to be recognized in the gradual stratum with the resistivity continuously increasing.However,no matter which experimental model,when there is a "u-shaped" wetting band in the local layer,a "pot bottom" pattern with thin ends and thick middle will appear.(2)in leibo county east landslide landslide as an example,the drilling on the can specification work high and steep landslide danger,reasonable decorate high-density electrical method survey line formation data,using RES2 DINV software for inversion to generate high density inversion section,through the little hole check analysis,generate effective reaction formation change law of long distance geological profile;(3)in CAD,relevant formation coordinates and depth data are extracted from geological sections,and the interpolation function of SURFER software is used to generate smooth formation surface data files.GOCAD software is used to generate 3d geological model.Finally,ANSYS software is used for grid division and the model is imported into FLAC3 D for stability analysis and calculation.(4)using the FLAC3 D respectively on the landslide condition,get the landslide under the condition of "the maximal displacement distribution cloud" and "maximum shear strain increment cloud",intuitive reflect the leibo chengdong,landslide under natural conditions,the maximal displacement:33 mm,maximum shear strain increment:1.1 mm,the maximum displacement:55mm,the maximum shear strain increment:1.8mm,the overall treatment of the landslide is basically stable;Under the working condition of rainstorm,the maximum displacement is 110 mm and the maximum shear strain increment is 4.3mm.(5)with traditional landslide stability analysis method for calculating the landslide stability analysis and checking calculation of under the condition of two-dimensional profile,the results show that the two-dimensional profile calculation of safety factor are lower than those of three dimensional integral calculation of safety factor,cause the reason for that option section for the most unfavorable section of the potential sliding landslide,does not take into account the transverse traction,but threedimensional integral analysis results are more consistent with actual situation;(6)by using the high density resistivity method,draw a long formation curve,to establish the three-dimensional model of landslide,landslide stability analysis using the FLAC3 D,feasible,especially for the special case of landslide engineering survey has strong security,economic,and time saving advantage,three-dimensional simulation of intuition and precision,the engineering management and site construction has a strong guiding significance.