Numerical Analysis Of High And Steep Slopes Stability In Open-pit Mines Based On Delaunay Tetrahedralization And Reliablity Theory

The stability of high and steep rock slopes is a major safety hazard in open-pit mining,and the analysis of its stability has been the focus of research.Using a single method to analyze it has certain limitations,and the analysis results aren’t comprehensive enough.If two or more analysis methods are combined,the slope stability will be more comprehensive insight.Therefore,a numerical analysis method based on the combination of Delaunay tetrahedronization and reliability theory is proposed to analyze the stability of high and steep slopes,and the method is applied to the analysis of the stability of high and steep slopes in an openpit copper mine.The main conclusions are as follows:(1)In the pre-processing of numerical simulation,used VC++ as the platform,the tetrahedral algorithm was compiled into an executable program,the slope model could be divided into Delaunay tetrahedral meshes according to the actual size of the slope project and the stratum information and a high-quality 3D slope model could be generated.(2)The tetrahedral slope model was imported into FLAC3 D,and the strength reduction method was used for numerical simulation to determine the most probable sliding surface and the corresponding safety factor.The numerical simulation results of the tetrahedral and hexahedral models were compared.The results showed that the calculation accuracy of tetrahedron was higher than that of hexahedron,the number of meshes was more and the density was uniform,stress concentration wasn’t easy to occur,the sliding trend of slope body could be seen more clearly,and the tetrahedron could reflects the subtle changes in the internal stress of the slope body,and the calculation results were more realistic.(3)According to the contour map of slope displacement,the FISH language programming was used to obtain the coordinates of the data points in the area with the most dense contour lines;and Origin was used to perform nonlinear fitting to find the potential failure surface of the slope,and to calculate the reliability.The check point method was used to iteratively solve the reliability of the slope.The iterative algorithm was written by C++,which improved the calculation accuracy and reduced the calculation time.(4)The stability analysis of a high steep slope in an open-pit copper mine showed that when the safety factor of the slope was 1.80,the reliability index was 2.38 and the failure probability was 0.866%,which was a stable slope.