基于UDEC-DM方法的岩质边坡变形破裂演化过程研究

RESEARCH ON DEFORMATION AND RUPTURE EVOLUTION PROCESS OF ROCK SLOPE BASED ON UDEC-DM METHOD

在常规UDEC模型的基础上通过引入胶结多边形块体,从而构建UDEC-DM模型,为岩体裂隙的发展提供了新的路径,使岩体的变形破裂能在完整岩石内部产生,而不仅仅局限于已有的宏观结构面。并结合龙桥特大桥5#拱座基坑边坡的开挖过程进行模拟分析,通过对比数值模拟结果与实际破坏情况,结果表明,龙桥特大桥5#拱座基坑在开挖至设计高程时,右侧边坡(逆向坡)基本稳定,左侧边坡(顺向坡)则产生滑移变形,并在岩体内部形成张拉裂隙,最终形成张拉破坏。总体上,UDEC-DM模型相较于常规的UDEC模型能更真实的还原岩质边坡在变形破坏过程中裂隙的萌生、扩展和贯通的过程。

Based on the conventional UDEC model, the UDEC-DM model is constructed by introducing a cemented polygonal block, which provides a new path for the development of rock mass fractures, so that the deformation and fracture energy of the rock mass can be generated inside the intact rock, not just the existing macroscopic structural surface. The simulation analysis is carried out in combination with the excavation process of the 5# abutment foundation pit slope of Longqiao Bridge. By comparing the numerical simulation results with the actual damage, The results show that the right side slope (reverse slope) is basically stable after the excavation of the 5# abutment foundation pit of Longqiao Bridge, and the left side slope (the forward slope) produces slip deformation.Inside the rock mass, tensile cracks are formed, eventually forming tensile failure. In general, the UDEC-DM model can more realistically restore the process of initiation, propagation and penetration of fractures during deformation and failure than the conventional UDEC model. during deformation and failure than the conventional UDEC model.