Failure mechanism and mode of surrounding rock of underground powerhouse at the right bank of Wudongde hydropower station subjected to excavation
LI Ang1，2，DAI Feng1，2，XU Nuwen2，3，GU Gongkai4，LIU Ke4，LI Biao2
(1. School of Architecture and Environment，Sichuan University，Chengdu，Sichuan 610065，China；2. State Key Laboratory of Hydraulics and Mountain River Engineering，Sichuan University，Chengdu，Sichuan 610065，China；3. Stake Key Laboratory of Geohazard Prevetion and Geoenvironment Protection，Chengdu，Sichuan 610059，China；4. China Three Gorges Corporation，Beijing，100038，China)
Abstract：The layout of the underground group caverns of Wudongde hydropower station at the right bank has a complicated form，and the structure-controlled failure phenomena occurred frequently due to the low stress condition and unfavorable formations of rock stratum，such as high dip angle and low strike angle. In this study，the modes and causes of failure of the surrounding rock near the downstream abutment of the main powerhouse at the right bank are systematically summarized with the geological data，field surveys，traditional monitoring，micro-seismic(MS) monitoring and numerical simulation. Firstly，the essential characteristics of the failure of surrounding rocks including the failure modes，spatial locations，scale of destruction and damage process，are summarized. Secondly，the temporal variation of the micro-seismic activity and the micro-seismic precursory characteristics of the failure of layered rock during the development of the studied failure are obtained. Finally，the flexural toppling failure of the surrounding rocks and the causes of this phenomena are revealed. The influence of rock structure on the failure of the surrounding rocks near the abutment is also discussed in detail by using a comprehensive method，which incorporates the micro-seismic monitoring and numerical simulation.
李 昂1，2，戴 峰1，2，徐奴文2，3，顾功开4，刘 科4，李 彪2. 乌东德水电站右岸地下厂房开挖围岩破坏模式及形成机制研究[J]. 岩石力学与工程学报, 2017, 36(4): 781-793.
LI Ang1，2，DAI Feng1，2，XU Nuwen2，3，GU Gongkai4，LIU Ke4，LI Biao2. Failure mechanism and mode of surrounding rock of underground powerhouse at the right bank of Wudongde hydropower station subjected to excavation. , 2017, 36(4): 781-793.
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2017, Vol. 36 
