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| GEOMECHANICS MECHANISM AND CHARACTERISTICS OF SURROUNDING ROCK MASS DEFORMATION FAILURE IN CONSTRUCTION PHASE FOR UNDERGROUND POWERHOUSE OF JINPING I HYDROPOWER STATION |
| (1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；2. College of Civil Engineering，Chongqing University，Chongqing 400045，China；3. Ertan Hydropower Development Company Ltd.，Chengdu，Sichuan 610021，China；4. Institute of Resources and Environment，North China University of Water Resources and Electric Power，Zhengzhou，Henan 450011，China) |
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Abstract Jinping I Hydropower Station located in the Southwest China is a key cascade and control underground hydropower project at the Yalong River. The project is very huge and the underground powerhouse system is very complicated，as well as the complex geological conditions，lower strength for rock relative to very high geostress especially. The challenge which no found in historical projects is presented by two dominate aspects in the construction. The two ones are stability and reinforce of surrounding rock. The characteristics of deformation split of surrounding rock and failure of supporting structure is described based on the geological conditions，monitor and geophysical prospecting，investigations in-situ and tests data. The correlations are discussed which deformation failure of surrounding rock and supporting structure with geostress，rock mass structure and mechanical property of rock under loading and unloading. The geomechanics mechanism of deformation failure of the surrounding rock and supporting structure is explained. The tangential loading stress is rather large and inclined to split pressed at downstream side(especially hance) of main powerhouse and main transformer house，but the normal unloading stress is rather larger and inclined to tension and relaxation unloaded because of the high geostress and its direction. The rheological behaviour of the fracture surrounding rock is presented，and is gradually charactered from surface to deep，the time-dependent deformation of fracture rock mass with surrounding rock relaxation is showed. The surrounding rock at downstream side is easy to bend and break-off and low susceptibility to shear and slide of main powerhouse and main transformer house under secondary stress field，because that the upstream side is bedding but the downstream inverse slope with low dip angles. The powerhouse marble is presented that relative lower strength，heavy brittle and lower strain strength，easy to tension pressed under unloading.
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Received: 22 June 2010
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| [1] 姚显春，李 宁，曲 星，等. 拉西瓦水电站地下厂房三维高地应力反演分析[J]. 岩土力学，2010，31(1)：247–252.(YAO Xianchun，LI Ning，QU Xing，et al. Back analysis of three-dimensional initial geostress of Laxiwa underground powerhouse[J]. Rock and Soil Mechanics，2010，31(1)：247–252.(in Chinese))
[2] 张 明，孙思奥，李仲奎. 地下厂房布置优化及施工过程的显式有限差分法数值模拟[J]. 岩石力学与工程学报，2008，27(增2)：3 760–3 767.(ZHANG Ming，SUN Siao，LI Zhongkui. Numerical simulations of layout optimization and construction process of underground powerhouse with explicit finite difference method[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.2)：3 760–3 767.(in Chinese))
[3] 朱维申，孙爱花，王文涛，等. 大型洞室群高边墙位移预测和围岩稳定性判别方法[J]. 岩石力学与工程学报，2007，26(9)：1 729– 1 736.(ZHU Weishen，SUN Aihua，WANG Wentao，et al. Study on prediction of high wall displacement and stability judging method of surrounding rock for large cavern groups[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(9)：1 729–1 736.(in Chinese))
[4] 王水林，李春光，史贵才，等. 小湾水电站地下厂房洞室群弹脆塑性分析[J]. 岩石力学与工程学报，2005，24(24)：4 449–4 454. (WANG Shuilin，LI Chunguang，SHI Guicai，et al. Analysis of underground powerhouses in Xiaowan hydropower station by elastic-brittle-plastic constitutive models[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(24)：4 449–4 454.(in Chinese))
[5] 江 权，侯 靖，冯夏庭，等. 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[J]. 岩石力学与工程学报，2008，27(9)：1 899–1 907.(JIANG Quan，HOU Jing，FENG Xiating，et al. Dynamic feedback analysis and engineering control of surrounding rock local instability in underground powerhouse of Jinping II hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(9)：1 899–1 907.(in Chinese))
[6] 李仲奎，周 钟，汤雪峰，等. 锦屏一级水电站地下厂房洞室群稳定性分析与思考[J]. 岩石力学与工程学报，2009，28(11)：2 167– 2 175.(LI Zhongkui，ZHOU Zhong，TANG Xuefeng，et al. Stability analysis and considerations of underground powerhouse caverns group of Jinping I hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(11)：2 167–2 175.(in Chinese))
[7] 周 钟，巩满福，汤雪峰，等. 四川省雅砻江锦屏一级水电站地下厂房洞室群围岩变形破坏机制及加固措施研究专题报告[R]. 成都：中国水电顾问集团成都勘测设计研究院，2009.(ZHOU Zhong，GONG Manfu，TANG Xuefeng，et al. Report on mechanism of the surrounding rock mass deformation failure and support design for the underground powerhouse group caverns construction of Jinping I hydropower project located on Yalongjiang River[R]. Chengdu：Chengdu Hydroelectric Investigation and Design Institute of SPC，2009.(in Chinese))
[8] 陈赛超，董燕君，鲁晓明，等. 锦屏一级水电站引水发电系统及地下厂房安全监测专题报告[R]. 锦屏：锦屏建设管理局锦屏一级安全监测管理中心，2010.(CHEN Saichao，DONG Yanjun，LU Xiaoming，et al. Special report on the safety monitoring for the water supply and power generation system and the underground powerhouse of Jinping I hydropower project[R]. Jinping：Jinping I Safety Monitoring and Management Center of Jinping Construction Bureau，2010.(in Chinese))
[9] 黄润秋，黄 达，段绍辉，等. 雅砻江锦屏一级水电站地下厂房围岩变形开裂的地质环境条件及成因机制研究[R]. 成都：成都理工大学，2010.(HUANG Runqiu，HUANG Da，DUAN Xiaohui，et al. Study on geologic environment condition and formation mechanism of the surrounding rock mass deformation failure for the underground powerhouse group caverns construction of Jinping I hydropower project located on Yalongjiang River[R]. Chendu：Chengdu University of Technology，2010.(in Chinese))
[10] 周 钟，巩满福，侯东奇，等. 四川省雅砻江锦屏一级水电站地下厂房洞室群施工期围岩稳定与支护设计报告(4)[R]. 成都：中国水电顾问集团成都勘测设计研究院，2008.(ZHOU Zhong，GONG Manfu，HOU Dongqi，et al. Report on the surrounding rock mass stability and support design for the underground powerhouse group caverns construction of Jinping I hydropower project located on Yalongjiang River(No.4)[R]. Chengdu：Chengdu Hydroelectric Investigation and Design Institute of SPC，2008.(in Chinese))
[11] 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))
[12] 黄润秋. 中国西南岩石高边坡的主要特征及其演化[J]. 地球科学进展，2005，20(3)：292–297.(Huang Runqiu. Main characteristics of high rock slopes in southwestern China and their dynamic evolution[J]. Advances in Earth Sciences，2005，20(3)：292–297.(in Chinese))
[13] 靳晓光，王兰生，李晓红. 地下工程围岩二次应力场的现场测试与监测[J]. 岩石力学与工程学报，2002，21(5)：651–653.(JIN Xiaoguang，WANG Lansheng，LI Xiaohong. Site testing and monitoring of induced stress field in surrounding rocks of underground engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2002，21(5)：651–653.(in Chinese))
[14] 王士天，黄润秋，李渝生，等. 雅砻江锦屏水电站重大工程地质问题研究[M]. 成都：成都科技大学出版社，1998.(WANG Shitian，HUANG Runqiu，LI Yusheng，et al. A study on the key engineering geological problems at Jinping Hydropower Station，Yalong River[M]. Chengdu：Chengdu University of Science and Technology Press，1998.(in Chinese))
[15] 黄润秋，王士天，张倬元，等. 中国西南地壳浅表层动力学过程与工程环境效应研究[M]. 成都：四川大学出版社，2002.(HUANG Runqiu，WANG Shitian，ZHANG Zhuoyuan，et al. Epigentical process of the earth crust in Southwestern China and engineering environmental effects[M]. Chengdu：Sichuan University Press，2002. (in Chinese))
[16] 黄 达，黄润秋. 卸荷条件下裂隙岩体变形破坏及裂纹扩展演化的物理模型试验[J]. 岩石力学与工程学报，2010，29(3)：502–512.(HUANG Da，HUANG Runqiu. Physical model test on deformation failure and crack propagation evolvement of fissured rocks under unloading[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(3)：502–512.(in Chinese)) |
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2011, Vol. 30 
