乌东德水电站地下厂房开挖过程微震监测与围岩大变形预警研究

doi:10.13722/j.cnki.jrme.2017.1184

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Abstract

The deformation of the right bank underground powerhouse at Wudongde hydropower station was the key issue due to its complicated geological conditions and large-scale excavation of the caverns，which seriously influenced construction schedules and personnel safety. A high-precision microseismic(MS) monitoring system was introduced to the underground caverns. The tempo-spatial evolution laws of MS events were analyzed. Combined with field construction，geological information and conventional monitoring data，the main damage characteristics of the underground powerhouse were revealed. Compared with the monitoring surface deformation data of surrounding rock mass，the seismic source parameters evolution laws were researched in the process of large deformation. An MS multiple parameters based early warning method for rock mass large deformation was proposed. The results indicated that the MS activity can sufficiently reflect the disturbing intensity of surrounding rock mass subject to the construction of the underground powerhouse. The deformation and damage was closely related to the MS propagation and evolution. Prior to the large deformation of surrounding rock mass，the MS events frequently occurred. Meanwhile，the energy index increased sharply and the apparent volume grew smoothly. In addition，the frequencies of MS signals gradually decreased. The research results will provide significant references for later excavation，supports and large deformation forecasting of the underground caverns.

Key words： hydraulic engineering Wudongde hydropower station underground powerhouse microseismic monitoring seismic source parameters large deformation forecasting

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	Articles by authors
	LI Biao 1
	XU Nuwen2
	DAI Feng2
	GU Gongkai3
	LIU Ke3
	GUO Liang2
	JIANG Peng2

Cite this article:

LI Biao 1,XU Nuwen2,DAI Feng2, et al. Microseismic monitoring and large deformation forecasting research during excavation of underground powerhouse at Wudongde hydropower station[J]. , 2017, 36(S2): 4102-4112.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1184 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS2/4102

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