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| DEFORMATION AND FRACTURE OF SURROUNDING ROCK MASS OF UNDERGROUND CAVERNS AT HOUZIYAN HYDROPOWER STATION |
| LI Zhipeng1，XU Guangli1，DONG Jiaxing2，LI Zhigang1，WANG Jinsheng3，CHEN Chunwen3 |
(1. Engineering Research Center of Rock and Soil Drilling and Excavation and Protection of Ministry of Education，China University of Geosciences，Wuhan，Hubei 430074，China；2. Faculty of Electric Power Engineering，Kunming University of Science and Technology，Kunming，Yunnan 650500，China；3. PowerChina Chengdu Engineering Corporation Limited，Chengdu，
Sichuan 610072，China) |
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Abstract The surrounding rock mass of the underground caverns at Houziyan hydropower station is under high ground stresses and has a low strength-to-stress ratio，leading to severe rock deformations and failures in the process of construction. The deformation and fracture characteristics of the surrounding rock mass were analyzed according to the geological conditions，the data from monitoring and geophysical detection，and the construction process. The proportions of the measured points with the displacements greater than 50 mm in three main caverns are 17.2%，27.3% and 9.4% respectively. The deformations of the surrounding rock mass of the underground caverns are much greater than the ones of the underground caverns at other stations in the same period. The largest displacement is in the rock of category III1，which indicates that the deformation of rebound of the relatively complete and hard rock due to unloading under high ground stress are quite large. The depths of surrounding rock deformation reache 5 to 15 m，even up to 23 m. The deformation of surrounding rock was found to be closely related to the excavation with a stepped process of development. The deformation of the surrounding rock is largely stress driven with the stress redistribution playing the dominant role and the one to be gravity driven controlled by the adverse combination of structural planes played less roles.
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Received: 17 June 2014
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| [1] 彭 琦，王俤剀，邓建辉，等. 地下厂房围岩变形特征分析[J]. 岩石力学与工程学报，2007，26(12)：2 583–2 587.(PENG Qi，WANG Dikai，DENG Jianhui，et al. Analysis of surrounding rock deformation characteristics in underground powerhouse[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(12)：2 583–2 587.(in Chinese))
[2] 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 powerhouse in the Three Gorges Project[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(5)：690–695.(in Chinese))
[3] 魏进兵，邓建辉，王俤剀，等. 锦屏一级水电站地下厂房围岩变形与破坏特征分析[J]. 岩石力学与工程学报，2010，29(6)：1 198– 1 205.(WEI Jinbing，DENG Jianhui，WANG Dikai，et al. Characterization of deformation and fracture for rock mass in underground powerhouse of Jinping I hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(6)：1 198–1 205.(in Chinese))
[4] 黄秋香，邓建辉，苏鹏云，等. 瀑布沟水电站地下厂房洞室群施工期围岩位移特征分析[J]. 岩石力学与工程学报，2011，30(增1)： 3 032–3 042.(HUANG Qiuxiang，DENG Jianhui，SU Pengyun，et al. Analysis of surrounding rock displacement character during construction in Pubugou hydropower station underground powerhouse chambers[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(Supp.1)：3 032–3 042.(in Chinese))
[5] 高春玉，邓建辉，魏进兵. 官地地下厂房洞室群施工期围岩位移特征分析[J]. 岩石力学与工程学报，2012，31(增2)：3 911–3 919. (GAO Chunyu，DENG Jianhui，WEI Jinbing. Analysis of surrounding rock displacement characteristics during construction in Guandi underground powerhouse chambers[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(Supp.2)：3 911–3 919.(in Chinese))
[6] 谷兆祺，彭守拙，李仲奎. 地下洞室工程[M]. 北京：清华大学出版社，1994：167–178.(GU Zhaoqi，PENG Shouzhuo，LI Zhongkui. Underground caverns engineering[M]. Beijing：Tsinghua University Press，1994：167–178.(in Chinese))
[7] 黄 达，黄润秋，张永兴. 断层位置及强度对地下洞室围岩稳定性影响[J]. 土木建筑与环境工程，2009，31(2)：68–73.(HUANG Da，HUANG Runqiu，ZHANG Yongxing. Analysis of influence of fault location and strength on deformation and stress distribution of surrounding rocks of large underground openings[J]. Journal of Civil，Architectural and Environmental Engineering，2009，31(2)：68–73. (in Chinese))
[8] 丁秀丽，董志宏，卢 波，等. 陡倾角沉积岩地层中大型地下厂房开挖围岩变形失稳特征和反馈分析[J]. 岩石力学与工程学报，2008，27(10)：2 019–2 026.(DING Xiuli，DONG Zhihong，LU Bo，et al. Deformation characteristics and feedback analysis of surrounding rock of large underground powerhouses excavated in steeply dipped sedimentary rock strata[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(10)：2 019–2 026.(in Chinese))
[9] 李大国，李江南，李学政. 龙滩水电站地下厂房变形机制与治理[J]. 水力发电，2004，30(6)：13–15.(LI Daguo，LI Jiangnan，LI Xuezheng. Analysis of the mechanism and treatment of the deformation Longtan underground powerhouse[J]. Water Power，2004，30(6)：13–15.(in Chinese))
[10] 陈仲先，汤 雷. 高地应力大型地下洞室的位移和锚杆应力特性[J]. 岩土工程学报，2000，22(3)：294–298.(CHEN Zhongxian，TANG Lei. Rock displacement and load of bolts around large-scale cavities with high stresss[J]. Chinese Journal of Geotechnical Engineering，2000，22(3)：294–298.(in Chinese))
[11] 张志国，肖 明. 地下洞室监测位移场的反演和围岩稳定评判分析[J]. 岩石力学与工程学报，2009，28(4)：813–818.(ZHANG Zhiguo，XIAO Ming. Inversion of monitored displacement field and evaluation of surrounding rock stability of underground caverns[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(4)：813–818.(in Chinese))
[12] 杨林德，颜建平，王悦照，等. 围岩变形的时效特征与预测的研究[J]. 岩石力学与工程学报，2005，24(2)：212–216.(YANG Linde，YAN Jianping，WANG Yuezhao，et al. Study of time-dependent properties and deformation prediction of surrounding rock[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(2)：212–216.(in Chinese))
[13] 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 cavern group under complicated geological conditions[J]. Journal of Engineering Geology，2008，16(1)：84–88.(in Chinese))
[14] 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))
[15] 李攀峰，张倬元，陶连金. 岩体质量对地下工程开挖效应的影响研究[J]. 地质灾害与环境保护，2004，15(3)：82–86.(LI Panfeng，ZHANG Zhuoyuan，TAO Lianjin. Study on the rockmass qualities influences on the excavation effects of underground project[J]. Journal of Geological Hazards and Environment Preservation，2004，15(3)：82–86.(in Chinese))
[16] 朱泽奇，盛 谦，张勇慧，等. 大岗山水电站地下厂房洞室群围岩开挖损伤区研究[J]. 岩石力学与工程学报，2013，32(4)：734–739.(ZHU Zeqi，SHENG Qian，ZHANG Yonghui，et al. Research on excavation damage zone of underground powerhouse of Dagangshan hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(4)：734–739.(in Chinese))
[17] 魏志云，徐光黎，申艳军，等. 大岗山水电站地下厂房区辉绿岩脉群发育特征及稳定性状况评价[J]. 工程地质学报，2013，21(2)：206–215.(WEI Zhiyun，XU Guangli，SHEN Yanjun，et al. Characteristic and stability evaluations of diabase dikes group surrounding underground caverns of Dagangshan hydropower station[J]. Journal of Engineering Geology，2013，21(2)：206–215.(in Chinese))
[18] 黄润秋，黄 达. 高地应力条件下卸荷速率对锦屏大理岩力学特性影响规律试验研究[J]. 岩石力学与工程学报，2010，29(1)：21–33.(HUANG Runqiu，HUANG Da. Experimental research on affection laws of unloading rates on mechanical properties of Jinping marble under high geostress[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(1)：21–33.(in Chinese))
[19] 卢 波，王继敏，丁秀丽，等. 锦屏一级水电站地下厂房围岩开裂变形机制研究[J]. 岩石力学与工程学报，2010，29(12)：2 429–2 441. (LU Bo，WANG Jimin，DING Xiuli，et al. Study of deformation and cracking mechanism of surrounding rock of Jinping I underground powerhouses[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(12)：2 429–2 441.(in Chinese))
[20] 程丽娟，侯 攀，李治国. 尾水调压室围岩变形原因分析及加固措施研究[J]. 人民长江，2014，45(8)：55–59.(CHENG Lijuan，HOU Pan，LI Zhiguo. Study on deformation mechanism and reinforcement measures of surrounding rock of surge chamber[J]. Yangtze River，2014，45(8)：55–59.(in Chinese))
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2014, Vol. 33 
