STUDY OF DEFORMATION AND CRACKING MECHANISM OF SURROUNDING ROCK OF JINPING I UNDERGROUND POWERHOUSE
(1. Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources，Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China；2. Jinping Construction Bureau，Ertan Hydropower Development Co.，Ltd.，Chengdu，Sichuan 610021，China)
Abstract：Aiming at the deformation and cracking phenomena of surrounding rock mass during the excavation of Jinping I hydropower station underground powerhouse under the conditions of high stress and low strength stress ratio，the characteristics and laws of in-situ stress field are studied entirely by the stereographic projection method and projection stress on typical planes. The deformation and cracking mechanism of surrounding rock of underground caverns group are deeply analyzed through mechanical qualitative analysis and 3D numerical simulation；and the damage evolution law of surrounding rock is studied. The results show that the relatively large deformation and cracking phenomena of surrounding rock and shotcrete layer of underground powerhouse are caused essentially by the adverse combination of the high ground stress and relatively low rock strength. The cracking failures in haunch，arch abutment and side wall of main powerhouse and main transformer chamber，and in side wall of busbar tunnels are typical unloading deformations and failures under the conditions of high stress，low strength stress ratio. The generalized model of surrounding rock deformation and cracking of underground powerhouse is presented. It affords important reference and qualitative basis for the back analysis of in-situ stress field and the numerical simulation of excavation process. Finally，some advices are given to maintain the stability of surrounding rock mass. All the results afford technical support to the construction and dynamic support design of the underground powerhouse.
卢 波1，王继敏2，丁秀丽1，邬爱清1，段绍辉2，黄书岭1. 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): 2429-2441.
LU Bo1，WANG Jimin2，DING Xiuli1，WU Aiqing1，DUAN Shaohui2，HUANG Shuling1. STUDY OF DEFORMATION AND CRACKING MECHANISM OF SURROUNDING ROCK OF JINPING I UNDERGROUND POWERHOUSE. , 2010, 29(12): 2429-2441.
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2010, Vol. 29 
