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| DEFORMATION MECHANISM ANALYSIS OF SURROUNDING ROCK AT ARCH CROWN IN UNDERGROUND POWERHOUSE |
| HUANG Qiuxiang1，WANG Jialin1，DENG Jianhui2 |
| (1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；2. State Key Laboratory of Hydraulics and Mountain River Engineering，College of Water Resource and Hydropower，Sichuan University，Chengdu，Sichuan 610065，China) |
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Abstract Aiming at the phenomenon of partial cracking and deformation of surrounding rock mass developing continuously at arch crown in the underground powerhouse，based on geology，monitoring data and construction process，qualitative analysis and quantitative analysis are made respectively combining with information of macroscopic deformation character and results of safety monitoring. The phenomena of collapse and crack occurred during the excavation of underground caverns is mainly formed by small unstable blocks because of stress distribution and blasting effect. Among the causes of its formation，the structure surface of fault and rock cracks is the main geological factor，and supporting lag is the main factor of construction. So considering the discontinuous characteristics of rock masses，it is important to take timely and effective support measures to ensure that surrounding rock mass of arch crown is in situation of stability. Parallel construction can speed up the construction progress in a certain extent，but it could have an effect on the displacement of surrounding rock. In the situation of parallel construction，although construction work has been far from arch crown，due to high construction intensity and frequent blasting，the displacement development of surrounding rock mass is still controlled obviously by construction schedule. So under the condition of complex geology，it is very necessary to avoid the parallel construction during construction process.
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Received: 29 May 2012
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| [1] 邬爱清，徐 平，徐春敏，等. 三峡工程地下厂房围岩稳定性研究[J]. 岩石力学与工程学报，2001，20(5)：690–695.(WU Aiqing，XU Ping，XU Chunmin，et al. Researches on stability for surrounding rock masses of underground power house in the Three Gorges project[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(5)：690–695.(in Chinese))
[2] 张志强，李 宁，SWOBODA G. 软弱夹层分布部位对洞室稳定性影响研究[J]. 岩石力学与工程学报，2005，24(18)：3 252–3 257. (ZHANG ZHiqiang，LI Ning，SWOBODA G. Influence of weak interbred distribution on stability of underground openings[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(18)：3 252–3 257.(in Chinese))
[3] 晏长根，刘 彤，伍法权. 复杂条件下大型地下洞室群的变形稳定性分析[J]. 工程地质学报，2008，16(1)：84–88.(YAN Changgen，LIU Tong，WU Faquan. Deformation and stability analysis of large-scale underground cavity group under complicated geological conditions[J]. Journal of Engineering Geology，2008，16(1)：84–88.(in Chinese))
[4] 江 权，冯夏庭，陈国庆，等. 高地应力条件下大型地下洞室群稳定性综合研究[J]. 岩石力学与工程学报，2008，27(增2)：3 768– 3 777.(JIANG Quan，FENG Xiating，CHEN Guoqing，et al. Stability study of large underground caverns under high geostress[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.2)：3 768–3 777.(in Chinese))
[5] 王家祥，叶圣生，周质荣，等. 三峡地下电站主厂房顶拱块体模式及加固对策[J]. 人民长江，2007，38(9)：63–68.(WANG Jiaxiang，YE Shengsheng，ZHOU Zhirong，et al. Study on failure modes and countermeasure ofmain work shop top arch block at Three Gorges[J]. Yangtze River，2007，38(9)：63–68.(in Chinese))
[6] 任爱武，伍法权，范永波，等.复杂地质条件下顶拱大型不稳定块体分析与预测[J]. 工程地质学报，2008，16(6)：788–792.(REN Aiwu，WU Faquan，FAN Yongbo，et al. Analysis and forecast of large rock block instability at top arch under complex geological condition[J]. Journal of Engineering Geology，2008，16(6)：788–792. (in Chinese))
[7] 高光庭，陆瑞年. 岩滩扩建工程石英脉侵入带对厂房顶拱围岩稳定性影响分析[J]. 红水河，2009，28(1)：56–60.(GAO Guangting，LU Ruinian. Analysis on influence of to stability of surrounding rock at underground powerhouse crown in expansion project of Yantan hydropower station[J]. Hongshui River，2009，28(1)：56–60.(in Chinese))
[8] 王 丹，吴 静. 有限元方法在某水电站地下厂房顶拱层开挖施工方案比选中的应用[J]. 价值工程，2011，(1)：87–88.(WANG Dan，WU Jing. Finite element method using in the construction scheme selection of a hydropower station underground workshop arch excavation[J]. Value Engineering，2011，(1)：87–88.(in Chinese))
[9] 文俊杰，俞 猛，张柏山，等. 大朝山水电站地下厂房洞室群立体开挖施工[J]. 水力发电，2001，27(12)：41.(WEN Junjie，YU Meng，ZHANG Baishan，et al. Three-dimensional excavation of the cavern group for underground powerhouse of Dachaoshan hydropower station[J]. Water Power，2001，27(12)：41.(in Chinese))
[10] 陈 松，曹西高. 拉西瓦水电站高地应力区特大地下厂房开挖施工技术[J]. 水力发电，2007，33(11)：74–76.(CHEN Song，CAO Xigao. Excavation technique of extra-huge undergrouned powerhous in the area with high terrestrial stress of Laxiwa hydropower station[J]. Water Power，2007，33(11)：74–76.(in Chinese))
[11] 任少铭，曾志全. 小湾水电站地下厂房开挖技术[J]. 水力发电，2008，34(8)：43–46.(REN Shaoming，ZENG Zhiquan. Excavation technology of underground powerhouse of Xiaowan hydropower station[J]. Water Power，2008，34(8)：43–46.(in Chinese))
[12] 尹 强，杨建军. 向家坝电站地下厂房系统洞室开挖方法[J]. 四川水力发电，2009，28(4)：1–7.(YIN Qiang，YANG Jianjun. Cavern excavation method for underground powerhouse complex at Xiangjiaba hydropower station[J]. Sichuan Water Power，2009，28(4)：1–7.(in Chinese))
[13] 严 军，肖培伟，孙继林. 瀑布沟水电站地下厂房开挖施工综述[J]. 水力发电，2010，36(6)：56–59.(YAN Jun，XIAO Peiwei，SUN Jilin. Underground powerhouse excavation of Pubugou hydropower station[J]. Water Power，2010，36(6)：56–59.(in Chinese)) |
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2013, Vol. 32 
