Slope Stability Analysis Based On Midas In Nanshan County

This paper takes Jinhua City Xuan Yuan,Nanshan county project as the background,in the natural slope and artificial slope area as the object,through field survey,data collection and indoor test,the basic characteristics of slope and identify the formation mechanism and the state of the slope is studied,based on the parameter inversion method to obtain the basic the physical and mechanical parameters of the rock mass,and then use transfer coefficient method to evaluate the stability of slope.Using Midas/GTS NX numerical simulation software based on finite element method,selection of slope stability of typical section was simulated according to the simulation results of stability evaluation and numerical transfer coefficient of contrast,the suggestions for the design of slope of governance.The main conclusions are as follows:(1)From the scene situation,Nanshan county project construction area research project area of excavation of natural slope is very high and steep.According to the field investigation,it is found that the thickness of the whole rock and the strong weathering zone of the slope are large,which is prone to instability.Under unfavorable weather conditions,that may cause geological disasters such as collapse,landslide and so on.(2)Through the transfer coefficient method,it is found that the stability coefficient of the slope of I to IV in natural conditions is 1.25,1.21,1.19 and 1.17 respectively under natural conditions,and the stability coefficients under rainfall conditions are 1.13,1.04,1.03 and 1.02.Considering the stability coefficient of landslides and combining with the code for investigation of landslide prevention and control engineering,the preliminary analysis shows that the four slope sections of the Nanshan county slope are in a stable state under natural conditions,and are in a state of less stable under the conditions of rainfall.(3)3D modeling of slope II and III is carried out by Midas/GTS,and numerical simulation analysis of slope stability is carried out.The stability of the typical slope is numerically simulated using the slope finite element reduction method "SRM",and the displacement cloud chart and strain cloud map of the slope are generated.Through the analysis of slope displacement and shear strain,the stability coefficient of the combined calculation is 1.31 and 1.28 under natural conditions,and 1.09 and 1.07 respectively under the condition of rainfall.The stability of the slope is studied by the stress cloud,strain cloud and displacement cloud,which is similar to the stability coefficient obtained by the transfer coefficient method,and the conclusion is consistent with the conclusion that the slope is in a stable state under natural conditions and under the condition of under stable condition under the condition of rainfall.(4)For the IV slope,the stability coefficient of the slope under natural condition is 1.21,which is in a stable state.In the case of rainfall infiltration,a two-dimensional geological model was established for the grade IV slope.The soil and soil characteristics of the engineering area were fitted by the soil and water characteristics curve of Van Genuchten model and the seepage curve.The pore water pressure and pore water under 0,2,4,6,8 and 10 h were calculated under the condition of heavy rainstorm.Head and head of total water,and obtain safety factor 1.05.The results show that the slope of No.4 is unstable under the condition of rainfall infiltration.