Abstract:

At present, in engineering application, there are something to improve and extended in unloading rock mass mechanics theory. First, unloading has effect on horizontal displacement of slope before and after anchor is applied; second, overbreak and anchor lag have effect on horizontal displacement of rock in the concrete engineering. Third, the connectivity rate of structural plane has effect on displacement of unloading rock; fourth, unloading rock has horizontal displacement response under earthquake action. Fifth, different connectivity rates have effect on horizontal displacement under earthquake action. So, based on unloading rock mass the theory, it carries out the research of Dagangshan dam abutment slope developing horizontal displacement. Adopting construction. It carries out the research of Dagangshan dam abutment slope. Pointed out that rebound deformation and compression deformation after the rock excavation unloading will be greater than does not take into account when calculating the deformation of the rock deterioration. Statistics of profiles of the horizontal displacement the characteristics with the development of the earthquake acceleration at different elevations, the proposed horizontal displacement with changes in earthquake acceleration was nonlinear region the focus of aseismic and reinforcement for the earthquake region it is. Indicated that the two types of program under unloading condition engender the smaller impact to the slope horizontal displacement, multi-stage overbreak, anchoring measures is lagging behind the scene of the feasibility of the construction process to provide a basis. The research shows that increase of connectivity rate will cause that plastic zone of unloading fissure XL9-15,XL316-1 increase obviously, but within fissures extension the increase of plastic zone is obviously not the key point reflected in the changes in slope, and the excavation work could cause the apparent smaller displacement of the status of the sudden collapse.