Pseudo Dynamic Analysis Of Rock Slope And Influence Of Tensile Strength Cut-off

With the rapid development of China’s infrastructure construction,the importance of rocky slopes is becoming more and more prominent compared with soil slopes,and they appear more frequently in the construction of mountainous roads,railroads and mines.The composition of rocky slopes is relatively complex,so the understanding of rocky slopes is still at the stage of recognition,and the research theory about it is not very mature.In this paper,the seismic stability of two-dimensional and three-dimensional rocky slopes and the stability of three-dimensional rocky slopes after considering the discounted tensile strength are studied based on Hoek-Brown strength criterion under the framework of limit analysis,and the proposed pseudo-dynamic method is focused to calculate the effects of earthquakes,and the change law of slope stability under relevant parameters is further discussed,which enriches the theoretical results of rocky slope research.The specific research contents of this paper are as follows:(1)The seismic stability of two-dimensional rocky slopes is studied.The damage mechanism of slopes is generated based on the associated flow criterion and the "point-to-point" discretization technique,the power of gravitational and seismic forces and the internal energy dissipation of slopes are derived,the expressions of safety factors of slopes are solved according to the energy balance formula,the program is written and the safety factors are optimized using MATLAB.A series of parametric analyses are carried out on the basis of verifying the correct results,and relevant suggestions are made for practical engineering.(2)The seismic stability of three-dimensional rock slope is studied.The external power and internal energy dissipation of the slope under continuous conditions are derived based on the ―horn‖ failure mechanism.The optimal solution of safety factor is solved by combining the program.The differences between pseudo-dynamic method and pseudo-static method in solving slope stability are compared.The influence of rock strength parameters,slope geometry parameters and earthquake-related parameters on safety factor is studied.(3)The stability of three-dimensional rock slope after tensile strength reduction is studied,and the power of gravitational work and internal energy dissipation of the slope are derived based on the improved ―horn‖ mechanism.The influence of tensile strength reduction on safety factor under slope angle,Hoek-Brown criterion parameters and pore water pressure is compared,and reasonable engineering practice suggestions are given.