摘要
对陡倾层状岩层中乌东德水电站左岸地下厂房洞室群施工期围岩变形特征和支护体系受力进行分析,以主厂房为重点,采用现场原位监测、地质调查、数值仿真反馈等多手段研究岩体结构及岩性差异对巨型洞室围岩变形及松弛影响,分析变形随开挖时空变化规律、浅层锚杆与深层锚索对岩体结构控制效应。研究结果表明,地下厂房围岩位移为0~40 mm,位移较大部位出现在主厂房上游边墙中部、B类角砾岩区域以及'小夹角'部位;开挖揭露量级较大部位主要受岩体结构面及角砾岩岩性控制,结构面对施工爆破开挖敏感,施工期洞室最大位移达到65 mm,深部结构面张开位移是该部位主要位移;锚索(杆)支护起到了很好的控制作用。位移主要发生在开挖施工期,且随着开挖过程表现出台阶型特征,时效性特征不明显,洞室群总体稳定较好,支护系统处于正常工作状态。
The deformation characteristics of surrounding rock and the stress of supporting system during the construction of underground powerhouse group on the left bank of Wudongde Hydropower Station in steep stratified strata are analyzed. The deformation and relaxation of surrounding rock caused by rock mass structure and lithological difference are studied by means of in-situ monitoring, geological survey and numerical simulation feedback, with the main powerhouse as the focus, of which analysis of deformation with excavation time and space change law, shallow anchor and deep anchor cable on rock mass structure control effect. The study results show that the displacement of the surrounding rock of the underground powerhouse is 0-40 mm;the larger part of the displacement appears in the middle of the upper wall of the main powerhouse;the B breccia and the small intersection angle position. The larger parts of the excavation are mainly controlled by the rock mass structure and the rock property of B breccia, and the structure is sensitive to the blasting excavation;and the largest displacement of the caverns during the construction period is 65 mm;the displacement of the deep structural plane is the main displacement in this area;and the bolt and anchor cable support has played a good control role. The displacement is mainly in the period of excavation, and is step-growth type in the process of excavation. And the aging characteristics are not obvious;the overall stability of underground powerhouse is better;and the supporting system is in the normal working state.
作者
董志宏
钮新强
丁秀丽
翁永红
黄书岭
裴启涛
张练
DONG Zhi-hong;NIU Xin-qiang;DING Xiu-li;WENG YongHong;HUANG Shu-ling;PEI Qi-tao;ZHANG Lian(State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China;Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan, Hubei 430010, China;Changjiang Institute of Survey, Planning, Design and Research, Co., Ltd., Wuhan, Hubei 430010, China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2018年第S2期326-336,共11页
Rock and Soil Mechanics
基金
国家重点研发计划项目课题(No.2016YFC0400200)
国家自然科学基金项目(No.51779018,No.51539002,No.51809014)
中央级公益性科研院所基本科研业务费项目(No.CKSF2017054YT)~~
关键词
地下工程
施工期
监测反馈分析
变形特征
陡倾岩层
B类角砾岩
underground engineering
construction period
monitoring feedback analysis
deformation characteristics
steeply dipped rock strata
B breccia
作者简介
第一作者:董志宏,男,1978 年生,博士研究生,高级工程师,主要从事岩土工程稳定性研究与监测方面的科研工作。E-mail: 14968857@qq.com;通讯作者:丁秀丽,女,1965 年生,博士,教授级高工,主要从事岩体工程稳定性研究。E-mail: dingxl651010@163.com。
