反倾向边坡开挖变形破裂响应的物理模拟研究  

PHYSICAL SIMULATION STUDY ON DEFORMATION AND FAILURE RESPONSE OF AN ANTI-INCLINED SLOPE DURING EXCAVATION

作　　者：蔡国军[1] 黄润秋[1] 严明[1] 龚满福[2] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]成都勘测设计研究院,四川成都610041

出　　处：《岩石力学与工程学报》2008年第4期811-817,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金雅砻江水电开发联合研究基金重点资助项目(50539050)

摘　　要：通过建立边坡的地质结构模型,采用物理模拟研究中的底摩擦试验方法,研究在不同开挖比(坡角)情况下边坡的变形破裂响应;重点探讨不同开挖角对边坡变形破裂范围的影响以及掌握边坡的稳定性情况。此外,为验证物理模拟试验结果的可靠性,采用数值模拟方法,进行对比分析。研究结果表明:边坡开挖过程中,卸荷松弛带的深度为35～40m,其中,强松弛带的底界深度为20～25m;在这类特定条件下,适当增大边坡的开挖坡角对整体边坡的稳定性状况反而是有利的。这在一定意义上对传统的开挖观念是一个更新。Based on geologic structure model and the base contact friction experiment method, the deformation and failure response of the anti-inclined slope during excavation with different gradients are studied. The results reveal the depth of the unloading zones of slope and further development with the slope excavation. Furthermore, to verify the reliability of the physical simulation results, numerical simulation is conducted for comparison. The results show that during excavation, the depth of the slope intensively unloading zones is 30 - 40 m; and the depth of the relaxation belt of base is 20 - 25 m. It is found that the fracture intensity and plastic zone distribution are decreased with the increase of slope angle under the specific situation of original intensity relaxed slope. These achievements are helpful for the slope mode optimization and design of the slope reinforcement.

关 键 词：数值模拟 反倾向边坡 开挖 物理和数值模拟 底摩擦试验 变形破裂 

分 类 号：O242[理学—计算数学]