Elastoplastic Limit Equilibrium Method Of Complex Rock Slope Stability Analysis

The slope stability has been an important study object of geotechnical engineering all the time, and it relates to artificial and natural fields such as mining engineering, civil engineering, railway and highway engineering, hydrological and hydroelectric engineering, waste residue and garbage management engineering, hillside riverside, etc. With the fast development of domestic economy, the construction is on the increase. The slope disaster will be more and more serious, the involved slopes extend from simple soil slope to complex high rock slope, so the research of rock slope stability will be more and more significative.This paper studied the slope of Chengmenshan open-pit, following the research route as field investigation - laboratory test - establishment of calculation model - stability analysis of rock slope. In order to evaluate the stability of the slope, rock mechanics parameters, which derived from laboratory test firstly and then optimized by empirical formula, were adopted and analyzed by NCAP-FS program.On the basis of the limit theory of plasticity and according to the characteristic of traditional limit equilibrium method, an elasto-plastic limit equilibrium method was presented for stability analysis of rock slope. The minimum safety factor was defined as the reduction coefficient, when the system is fairly close to the limit equilibrium state through decrement of material strength step by step.The eastern slope (X=3285870) and the southern slope (Y=39383700) of Chengmenshan open-pit were selected as the calculation cases, analysis of the calculation results were made. The results showed that the factor of safety approximately is 1.06-1.15 and the slope is of stability at present.