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)
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.
李志鹏1，徐光黎1，董家兴2，李志刚1，王金生3，陈春文3. 猴子岩水电站地下厂房洞室群施工期围岩变形与破坏特征[J]. 岩石力学与工程学报, 2014, 33(11): 2291-2300.
LI Zhipeng1，XU Guangli1，DONG Jiaxing2，LI Zhigang1，WANG Jinsheng3，CHEN Chunwen3. DEFORMATION AND FRACTURE OF SURROUNDING ROCK MASS OF UNDERGROUND CAVERNS AT HOUZIYAN HYDROPOWER STATION. , 2014, 33(11): 2291-2300.
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2014, Vol. 33 
