楞古水电站碎裂岩质边坡变形破坏模式研究

发布时间：2018-01-27 01:58

本文关键词： 碎裂岩体坡体结构边界条件变形破坏模式离散元　出处：《工程地质学报》2017年02期 　论文类型：期刊论文

【摘要】：碎裂结构岩质边坡是地质工程中遇到的一种最不稳定边坡,其原岩松弛,结构面普遍张开,围岩自稳能力差,碎裂结构岩体出露不连续,空间分布存在差异,导致边坡破坏边界不明显,变形破坏机制很难确定。本文以雅砻江楞古水电站碎裂结构岩质边坡为例,在地质环境调查和平硐勘测的基础上,系统研究了碎裂岩体结构特征,分析了控制边坡变形破坏的边界条件和变形破坏模式,并运用UDEC离散元程序模拟验证。研究结果表明:碎裂岩质边坡的变形破坏主要受自身结构及内部相对长大结构面控制,变形演化过程依循应力调整、时效变形和局部失稳3个阶段,变形破坏模式分为断层主控底滑型和裂隙切割破坏型。目前针对碎裂结构岩质边坡研究相对较少,缺乏大型工程实例支撑,该研究成果为水利工程中这类边坡的研究提供了参考。
[Abstract]:Cataclastic rock slope is one of the most unstable slopes encountered in geological engineering. Its original rock is relaxed, the structural plane is generally open, the self-stability of surrounding rock is poor, the fractured rock mass is discontinuous, and the spatial distribution is different. The boundary of slope failure is not obvious, and the mechanism of deformation and failure is difficult to determine. This paper takes the cracked rock slope of Lungu Hydropower Station in Yalong River as an example, based on the investigation of geological environment and the investigation of tunnel. The structural characteristics of fractured rock mass are systematically studied, and the boundary conditions and deformation failure modes controlling the deformation and failure of slope are analyzed. The results show that the deformation and failure of the fractured rock slope are mainly controlled by its own structure and the internal relative long structure plane, and the deformation evolution process follows stress adjustment. In the three stages of aging deformation and local instability, the deformation and failure modes can be divided into two types: the main fault-controlled bottom slip type and the fracture cutting failure type. At present, there are relatively few researches on the rock slope with broken structure, which is short of the support of large engineering examples. The research results provide a reference for the study of this kind of slope in hydraulic engineering.
【作者单位】：地质灾害防治与地质环境保护国家重点实验室(成都理工大学);中国电建集团成都勘测设计研究院有限公司;
【基金】：国家自然科学基金(41572302) 四川省国土资源厅科学研究计划(KJ-2015-18)资助
【分类号】：TV223.3
【正文快照】： DEFORMATION FAILURE MODE OF FRACTURED ROCK MASS SLOPEIN LENGGU HYDROPOWER STATIONZHANG Yuyang(1)HUANG Runqiu(1)PEI Xiangjun(1)WEI Yufeng(1)WANG Zilong(1)WANG Gang(2)XIAO Huabo(2)((1)State Key Laboratory of Geohazard Prevention and Geoenvironment Protecti

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