猴子岩水电站地下厂房开挖过程微震特征与稳定性评价

doi:10.13722/j.cnki.jrme.2015.0516

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Abstract In order to real time monitor and evaluate the surrounding rock mass stability and identify the potential hazardous regions of the underground caverns at the Houziyan hydropower station subject to excavation，the comprehensive method incorporating numerical simulation，microseismic(MS) monitoring，traditional monitoring and field observation was adopted. Some results are obtained as follows：(1) MS monitoring can realize the real-time monitoring，analysis and evaluation of surrounding rock mass stability of the underground caverns due to excavation-induced unloading. (2) micro-fractures concentration areas of surrounding rock mass and potential hazardous regions in the underground caverns were delineated by the temo-spatial evolution of microseismicity. (3) the initiation，propagation and coalescence of micro-fractures due to excavation can be reflected by MS monitoring. With regard to the field construction and reinforcement of the underground caverns，the obvious and intense concentrations of MS events have already been regarded as the early warning of reducing the construction schedule. (4) the conventional monitoring methods such as multi-point extensometers，convergence gauges and anchor stress gauges，etc.，were used to verify the truthfulness and effectiveness of the results of MS monitoring. The presented results demonstrate that the combination of MS monitoring，numerical modeling，traditional surveying and in situ observation approaches lead to a better understanding of excavation behavior of underground caverns and a more satisfactory control of the working in terms of safety in the complex geological and excavation-induced unloading conditions. Furthermore，the results can provide some guidelines for later excavations and supports of the underground powerhouse.

Key words： hydraulic engineering microseismic monitoring numerical simulation stability underground cavern Houziyan hydropower station

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	Articles by authors
	XU Nuwen1
	2
	DAI Feng2
	LI Biao2
	ZHU Yongguo3
	CHENG Lijuan4
	WANG Qi1

Cite this article:

XU Nuwen1,2,DAI Feng2, et al. Microseismicity and stability evaluation of the underground powerhouse at Houziyan hydropower station subjected to excavation[J]. , 2016, 35(S1): 3175-3187.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.0516 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS1/3175

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