开采扰动下陡倾顺层边坡"滑移-压碎-剪断"破坏机理研究OA

In order to solve the problem of mining instability of steeply inclined bedding slopes(with strata inclination>60°)in Beskuduk open-pit mine in Xinjiang,a combination method of elastic mechanics analysis,Midas GTS NX numerical simulation,and on-site monitoring is adopted to study the progressive failure process and its disaster-causing mechanism of"sliding-crushing-shearing"under mining disturbance.The results show that the overall slope failure undergoes three continuous evolution stages:initial sliding,crushing at the slope toe,and shearing at the trailing edge;A dual criterion early warning model established based on energy release rate and stress intensity factor demonstrates relatively good identification effect for the critical mining depth in the case of local collapse on the east side of PM-4 profile,and its prediction results are closer to the on-site actual situations than the traditional strength reduction method;The crushing zone at the slope toe is a key control part that connects stress migration,strength weakening,and slip plane penetration.The research results can provide reference for stability analysis and disaster early warning of similar steeply inclined bedding slopes.