Slpoe Stability Analysis For An Open-pit Mining

Open-pit mining rock slope engineering is large-scale rock engineering by taking the rock mass as materials and structure, and mining operation as construction method. With the increasing of surface mining depth and slope height, a high and steep open-pit mining slope is gradually formed, resulting in the increased difficulty in coal mining and tunneling, and slope maintenance. Therefore, how to give a reasonable stability analysis of slope mine boundary has been becoming one of the most important research topics for us.By taking a certain open-pit mining rock slope engineering in Qinghai Province as the research object, this paper mainly studies its stability analysis, and then puts forwards the purposeful and reasonable governance opinions based on the results of stability analysis, to ensure the safety of mining production.This paper focuses on two main problems of stability analysis, one is how to obtain the mechanical parameters of rock mass. In this paper, φлceHKO method, M. Georgi method, and experience parametric method are used in analysis, statistics and analogy of soil test results, so as to obtain the basic parameters used in the Mohr-Coulomb model for slope stability analysis calculation. Another problem is the choice for the method of stability analysis. Firstly, on the basis of existing geotechnical disaster, geological exploration data and soil tests, this paper carries out an engineering geology zoning on the side slope in the open-pit mining, and provides a destroying mode of side slope in combination with the observation of field experiment. According to the commonly used Unbalanced Thrust Method and Simplified Bishop Method, the stability analysis of side slope was made to acquire a stability safety coefficient. The potential slip surface was determined through some optimization approaches such as accelerating simplex method, and safety coefficient and potential slip surface were obtained by calculation of current situation, original design, slope stability analysis after adjusting side slope structure parameters. At the same time, the static stability analysis of side slope was conducted by using the strength reduction FEM (Numerical analysis of ABAQUS software). Through stress strain value analysis, the concentration of stress and the levels of stress-strain for the Copper Mine slope were given, which could be a quantitative assessing index for the slope stability. Through comparison between the results of strength reduction FEM and limit equilibrium method in calculating the stability of side slope, the nearly coincidence of these results show the reasonableness of our analysis method. In the end, some discussions about the reasonable economic engineering method were made and the results of this paper will have some practical significance for the stability and subsequent production of the open-pit mining.