锦屏二级水电站地下厂房围岩局部不稳定问题的实时动态反馈分析与工程调控研究  

DYNAMIC FEEDBACK ANALYSIS AND ENGINEERING CONTROL OF SURROUNDING ROCK LOCAL INSTABILITY IN UNDERGROUND POWERHOUSE OF JINPING II HYDROPOWER STATION

作　　者：江权[1] 侯靖[2] 冯夏庭[1] 张春生[2] 陈建林[2] 向天兵[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]中国水电工程顾问集团公司华东勘测设计研究院,浙江杭州310014

出　　处：《岩石力学与工程学报》2008年第9期1899-1907,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金委员会、二滩水电开发有限责任公司雅砻江水电开发联合研究项目(50539090);国家科技支撑计划项目(2006BAB04A06);国家高技术研究发展计划(863计划)(2006AA06Z117);中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室开放基金项目(Z000701)

摘　　要：针对大型地下洞室开挖中频繁出现的局部失稳问题,提出围岩局部不稳定问题的实时动态反馈分析方法,满足了洞室不稳定区域防治的快速化和科学性要求。以具有代表性的锦屏二级水电站地下厂房第二层开挖过程中厂右0+263安装间部位上游边墙围岩单层变形增量达20 mm、变形速率达3.4 mm/d这一潜在不稳定问题为例,通过该部位围岩稳定性的实时动态反馈分析与工程调控的全过程分析,阐述如何走一条理论跟踪分析与工程调控相结合的新途径,以消除围岩的安全隐患。实践表明:将现场多元信息、反演分析和工程调控有机结合的实时动态反馈分析是解决地下工程局部稳定性问题的有效途径。另外,基于加固后的围岩等效力学参数的对比,通过现场工程实例方式证实锚杆提高围岩力学强度这一物理效应。Jinping Ⅱ Hydropower Station, located in Sichuan Province, is the biggest station at the Yalong River. In the excavation course of the second layer of the underground powerhouse, serious local instability problems arise at R0＋263 of the upstream side wall with the characters of deformation more than 20 mm and deformation rate of 3.4 mm/d. So, a new way integrating theoretical analysis and field engineering control is put forward. In the first phase, mechanical parameters of surrounding rock are identified; and engineering control methods are given. In the second phase, monitoring data and mechanical behavior of surrounding rock during excavation are analyzed; and the reinforcement scheme and reinforcement parameters are suggested. Finally, the instability problem is solved completely. The practice indicates that the method combining the real-time dynamic feedback analysis, multiform measurement information and theoretical analysis with engineering control together is very useful to deal with local instability problem in underground engineering. At the same time, the physical effect of anchor bolts which improve the mechanical strength of surrounding rock is certified according to the comparison of equivalent mechanical parameters of surrounding rock after reinforcement of anchor bolts.

关 键 词：岩石力学 地下工程 局部不稳定性 动态反馈分析 工程调控措施 锦屏二级水电站 锚杆物理效应 

分 类 号：TU45[建筑科学—岩土工程]