Abrupt Energy Change Analysis Of Slope Rock Mass In Xudonggou Mine

In this paper,taking the east slope of Xudonggou stope in Anshan as the research object,combined with the field geological survey data,the FLAC^3D numerical model is established,and the Hork-Brown strength theory,energy conservation principle,cusp catastrophe theory and limit equilibrium theory are applied to systematically analyze the energy mutation process and local slope stability during the excavation process of rock slope in Xudonggou mine.The main research results are as follows:According to the hydrogeological data on site,the main lithologic composition and slope geometric parameters of the east slope rock mass in Xudonggou stope are determined.The basic physical and mechanical parameters of different rock samples are obtained through laboratory tests.The three-dimensional slope model is established by using the numerical analysis method of finite difference method,and several measuring point units are selected to record and analyze the whole and the whole slope excavation process The evolution law of displacement,velocity,plastic deformation and energy of local slope.Combined with the energy principle,the temporal and spatial evolution law of energy in the process of slope excavation is recorded in detail by using the energy evolution analysis program of fish language,and the energy changes of local slopes with different shapes are compared and analyzed.The results show that the influence of local slope area shape on slope energy change trend can be ignored.Based on the cusp catastrophe theory,the energy criterion of slope rock mass failure is established,and the energy catastrophe process of local slope rock mass in Xudonggou mine is analyzed.The safety factor of slope under different excavation conditions is obtained by using energy catastrophe criterion,which is consistent with the slope safety factor obtained by displacement mutation,plastic zone breakthrough criterion and limit equilibrium method The quantity mutation criterion can judge the local slope instability more intuitively and uniformly,and the judgment has consistency,and the effect is better.Finally,the energy mutation evolution process of slopes with different lithology in the whole excavation process is analyzed.Combined with the exposed height of migmatite,chlorite quartz schist and magnetite quartzite and the safety factor of local slope,the reasons for frequent slip of East Slope in Xudonggou mine are given.