摘要
楞古水电站前期勘查发现自然边坡存在岩体大范围松动现象,主要表现为岩体结构面普遍张开、碎裂化程度高、围岩应力低、自稳性差。针对这一特殊的岩体结构,对岩体的松动类型和变形破坏特征进行了研究。通过对边坡岩体进行详细的地质编录和物理勘探试验,重点对节理裂隙的空间发育规律、碎裂结构岩体的空间分布及边坡已有变形破坏模式等方面进行了详细研究,同时结合声波测速、电磁勘探等试验成果,划分了岩体松动类型,归纳了每一种主控因素下的岩体变形破坏特征及破裂松动的演化过程。结果表明:岩体松动类型可划分为卸荷控制型、断层控制型、倾倒控制型以及节理裂隙控制型等4种类型,岩体的松动受浅表生改造和构造活动影响较大,节理化结构加剧了破裂过程。研究成果丰富了已有分类体系,对评价边坡稳定性以及控制地下工程围岩稳定和保障施工安全具有重要指导意义。
During the early-stage reconnaissance for the construction of Lenggu Hydropower Station, large scale loosening phenomenon of rock mass on the natural slope is found out therein, which mainly exhibits that the rock mass structural plane extensively opens along with high cracking degree, low surrounding rock stress and poor self-stability. For this particular structure of rock mass, the loosening types and deformation failure characteristics of the rock mass are studied herein. Through detailed geological cataloging and physical exploration test made on the rock mass of the slope, the spatial development law of the joint fissure, the spatial distribution of the fractured structure of the rock mass and the existed deformation failure modes of the slope are emphatically studied in detail, while the rock mass loosening types are divided and the rock mass deformation failure characteristics and the fracture loosening evolution processes under all the dominant factors are summed up as well. The result shows that the rock mass loosening types can be divided into the following four types, i.e. unloading control type, faulting control type, dumping control type and joint fissure control type, while the rock mass loosening is largely impacted by both the shallow surface modification and structural activity therein and then the fracturing process is aggravated by the jointed structure. The study result enriches the existed classification system and has an important guiding significance for assessing the stability of the slope as well as controlling the stability of the surrounding rock and ensuring the safety of the construction.
作者
王梓龙
裴向军
张御阳
刘明
张硕
肖华波
WANG Zilong;PEI Xiangjun;ZHANG Yuyang;LIU Ming;ZHANG Shuo;XIAO Huabo(City College,Southwest University of Science and Technology,Mianyang 621000,Sichuan,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu610059,Sichuan,China;PowerChina Chengdu Engineering Corporation Limited,Chengdu 610072,Sichuan,China)
出处
《水利水电技术》
北大核心
2019年第3期169-178,共10页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(41572302)
四川省国土资源厅科学研究计划(KJ-2015-18)
关键词
岩体松动
岩体卸荷
倾倒
节理裂隙
断层
工程地质灾害
rock mass loosening
unloading of rock mass
toppling
joint fissure
fault
engineering geological hazards
