Study On Factors Of Stability Of Joint Rock Slope Under Earthquake Action

Along with western development strategy,railway and highway are constructed in the mountains.So a large number of high slope on the side of the road form in the slope engineering.Joint rock slope is a kind of them and it damage easily under earthquake action because of its unique structure.It will cause great threat to the people life and property security.At present,the research on joint rock slope is not enough,especially for factors of stability of joint rock slope.Therefore it is important to research on factors of stability of joint rock slope under earthquake action for the slope safety.The paper uses a combination of qualitative and quantitative analysis to study based on the numerical simulation and the research status of domestic and overseas.The main conclusions are as follows:(1)Study on factors of stability of joint rock slope under earthquake action.The factors caused the slope instability are divided into internal cause external cause.Internal cause include landform,rock mass structure,lithological association and hydrogeology.External cause include seismic load,man-made destruction,etc.On the basis of previous studies,this paper puts forward the six main factors that affect joint rock slope:joint angle,joint cohesion,joint friction angle,the height and angle of the slope,the density of rock mass.Numerical simulation on joint rock high slope stability under earthquake action by UDEC.In this paper,under the premise of the same other factors,change the six factors one by one.Using safety coefficient under natural state and maximum displacement or maximum velocity under earthquake action to measure the slope stability,and then get some qualitative conclusions.(2)Factors of stability of joint rock slope sensitivity analysis.At first,it introduces the related concepts and the basic principle of sensitivity analysis of slope,and then study on six influence factors of slope stability by the single factor sensitivity analysis.On the basis of numerical simulation,the calculation results to measure the slope stability.The single factor sensitivity analysis include sensitivity coefficient analysis and sensitivity curve analysis.Using the two ways,it gets the same conclusion:in the case of other conditions unchanged,the sensitive degree of slope influence factors of slope stability are in the order:joint angle>joint friction angle>the height of the slope>joint cohesion>the density of rock mass>the height of the slope.(3)Overall process destruction analysis of the numerical simulation for actual case.To select the number 678-8 of guizhou highway as the numerical simulation test.Combined with the actual case,selecting the constitutive equation of rock mass and joint,obtaining the physics parameters of slope,and defining boundary conditions,the seismic wave and zone requirements.Compared the natural conditions of slope with the slope under seismic action,from the three aspects of the velocity,displacement and stress,it analyze the change of slope testing points in the process of destruction.It find that the slope stress change from the static equilibrium of compressive stress,then the slope is tensioned,along the direction of joint to develop into a whole crack in the sliding surface.Study on optimizing the numerical simulation process to achieve the higher precision and the lower internal friction.The research conclusions of this paper and a large number of numerical simulation results,provide the effective reference for the disaster prevention and academic research.It has higher application value and theoretical significance.