Stability Analysis Of Antaibao Slope Based On Strength Double Reduction Coefficient

At present,slope instability has become a global geological disaster,and the formation of China's geographical environment is more complex,which is one of t he countries seriously affected by slope instability accidents in the world.Through the slope stability analysis and accurate calculation is an important means to reduce the occurrence of slope instability.With the rapid development of society,the conti nuous improvement of computer computing ability and the deepening of finite element theory,more and more scholars use strength reduction method to analyze the slope stability.At present,the strength single reduction factor method is mostly used in the a nalysis of slope stability,that is,in the analysis of cohesion c and internal friction angle ? The same reduction factor is used when the tangent value of the slope is reduced,which ignores the attenuation degree in the process of instability of differe nt shear strength in the actual situation of the slope.In order to reflect the failure process of slope more truly,the strength double reduction coefficient method is adopted.However,the strength double reduction factor method considers the difference of contribution degree in the reduction process of cohesion and internal friction angle,but at present,the two shear strength reduction factors are established in a certain proportion,so in the process of calculation,it is necessary to carry out trial calculation step by step to determine the critical equilibrium state of the slope,which brings huge workload.In view of the above background and the main problems,this paper carries out the analysis of slope stability based on ABAQUS software strength double reduction coefficient method.This paper mainly analyzes the factors affecting the stability of soil slope,and gives the method to determine the proportion relationship between cohesion and internal friction angle reduction coefficient of soil slope,and analyzes the slope stability in the northwest of Antaibao open pit mine in pingsu mining area of Shanxi Province.The specific research contents and results are as follows:(1)Based on the research status of finite element strength reduction method in slope stability at home and abroad,this paper summarizes the existing problems,expounds the influencing factors of slope stability,and analyzes the influence degree of each influencing factor on slope stability coefficient.(2)Based on the differen ce of the influence degree of cohesion and internal friction angle on slope stability,the reduction ratio K is feasible in the strength double reduction coefficient method.(3)Through the finite element ABAQUS software,the strength double reduction coefficient method is used to study the slope stability.In the software,the field variables are defined to realize the transformation of reduction coefficient,and then the slo pe displacement and the development of plastic zone can be dynamically displayed in the software,and the slope safety factor in line with the actual situation can be calculated.(4)This paper analyzes the slope stability of the engineering case,compares and analyzes the calculation results of the traditional single reduction coefficient method,the limit equilibrium method and the strength double reduction coefficient method,and concludes that the strength double reduction coefficient method is more in line with the actual situation.Based on the above research on slope stability,the strength double reduction coefficient method is used to realize the slope stability analysis through the finite element ABAQUS software.In the calculation process,the method to determine the reduction ratio coefficient K value is proposed,which provides a new idea for the slope stability analysis.