摘要
Abstract
Taking the high rock excavation slope of the right bank abutment of a hydropower station in Jiangsu Province as the research object,based on the RFPA3D-Centrifuge numerical simulation method,the influence of the stress field evolution,deformation characteristics and mechanical parameters of the key fault fracture zone on the slope stability during the slope excavation process is systematically studied.The results show that under natural conditions,the stress concentration phenomenon is significant in the top and middle areas of the slope.During the excavation process,the unloading effect leads to stress redistribution,with intensified deformation near faults and weak structural planes.The failure mechanism of the slope is primarily characterized by the coupling effects of stress redistribution,rock mass unloading,and crack propagation,forming stress concentration zones at fault intersections.Through the sensitivity analysis of mechanical parameters in the fault fracture zone,it was found that the internal friction angle and compressive strength significantly enhance the safety factor of the slope,while the elastic modulus has a relatively small influence.The stability of fault F7 is superior to that of fault F6,with safety factors of 1.48 and 1.32 respectively.This is related to the geometric shape and stress distribution characteristics.The research results can provide theoretical support and technical guidance for similar projects.关键词
高陡边坡/边坡稳定性/断层破碎带/力学参数/数值模拟Key words
high and steep slopes/slope stability/fault fracture zone/mechanical parameters/numerical simulation分类
建筑与水利
