Analysis Of Slope Stability Based On Particle Flow And Finite Difference Numerical Method

With the current expansion of the scale of civil engineering construction,in various construction processes,the geological disasters related to the slope have become increasingly prominent.Especially for rock slopes,because of the complexity of the rock mass,there is still no satisfactory understanding of the instability mechanism of rock slopes and the determination of rock and soil parameters.How to strike a balance between economy and safety on the basis of ensuring safety is one of the problems that engineering design units have been pursuing to solve.In this paper,through point load test and particle flow numerical simulation,the real physical and mechanical properties of the rock can be obtained,which can reduce the steps of drilling rock samples in actual engineering,thereby saving costs and obtaining economic benefits.First of all,the thesis carried out point load experiments of typical sandstone based on field geological survey data.According to actual point load tests,numerical simulation of rock point load particle flow was carried out on the basis of the experiment,and the strength of the point load rock mass was tested,and the rock mass was uniaxially tested.After comparing the compressive strength and the strength of the point load particle flow numerical model,the appropriate value is selected as the physical and mechanical parameters of the rock and introduced into the stability analysis of the slope.Secondly,using the field experimental data of the structural surface strength of the slope rock mass as a reference,the mechanical parameters of the rock mass obtained by the point load particle flow method are combined into the national standard to estimate the strength of the rock slope structural surface,and the point load particle flow rock The strength parameters of the structural surface of the body are compared with the slope stability analysis of the actual field experiment strength,and the results of the slope stability analysis of the point load particle flow rock mass are quantitatively evaluated and effect feedback.And analyze the slope stability at each stage of the slope under different working conditions..Finally,taking the rocky slope at the side of Fujiashan in Bijiang District,Tongren City,Guizhou Province,which I led during my tenure,was taken as an example.Based on survey data and specifications,point load tests and uniaxial compressive strength tests were carried out through on-site sampling.The mechanical properties of sandstone in the high-quality slope are studied,and the range of physical and mechanical parameters of the rock and soil is determined.Based on the test results of the uniaxial compressive strength of the sandstone,based on the PFC particle flow analysis software,the meso-parameters in the model are studied.Based on the research results,the corresponding finite difference model is established,and the strength reduction method is used to analyze the stability of the rock slope.Corresponding design is carried out for the side slope support of Fujiashan,the support plan is proposed,and the support effect of different support plans is further analyzed.The results have certain reference significance.