Failure mechanism and mode of surrounding rock of underground powerhouse at the right bank of Wudongde hydropower station subjected to excavation

被引：0
|
作者：
Li A. [1 ,2 ]
Dai F. [1 ,2 ]
Xu N. [2 ,3 ]
Gu G. [4 ]
Liu K. [4 ]
Li B. [2 ]
机构：
[1] School of Architecture and Environment, Sichuan University, Chengdu, 610065, Sichuan
[2] State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, Sichuan
[3] Stake Key Laboratory of Geohazard Prevetion and Geoenvironment Protection, Chengdu, 610059, Sichuan
[4] China Three Gorges Corporation, Beijing
来源：
Xu, Nuwen (xunuwen@scu.edu.cn) | 2017年 / Academia Sinica卷 / 36期
基金：
中国国家自然科学基金;
关键词：
Failure mechanism; Layered rock; Micro-seismic monitoring; Numerical simulation; Rock mechanics; Underground powerhouse;
D O I：
10.13722/j.cnki.jrme.2016.0691
中图分类号：
学科分类号：
摘要：
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. © 2017, Science Press. All right reserved.
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页码：781 / 793
页数：12
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