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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摘要

乌东德水电站右岸地下厂房洞室群地质条件复杂，大规模洞室开挖导致围岩变形问题突出，严重影响施工进度及人员安全。引入高精度微震监测系统，分析微震时空演化特征，结合现场施工动态、地质资料和常规监测数据，揭示地下厂房围岩损伤特征；对比地下厂房围岩外观变形监测数据，探讨围岩大变形过程中震源参数演化规律，提出围岩大变形预警方法。研究表明：微震时空分布规律能够很好地反映地下厂房施工动态对围岩扰动情况，微震事件聚集演化与围岩变形损伤密切相关；围岩大变形开始前，微震活动频率增加；能量指数迅速增长至较高水平，视体积均匀增加；微震信号频率呈降低趋势。研究结果可为地下厂房洞室群后续开挖、加固及围岩大变形风险预测提供重要参考。

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	李彪1
	徐奴文2
	戴峰2
	顾功开3
	刘科3
	郭亮2
	姜鹏2

关键词 ：水利工程, 乌东德水电站, 地下厂房, 微震监测, 震源参数, 大变形预警

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

引用本文:

李彪1，徐奴文2，戴峰2，顾功开3，刘科3，郭亮2，姜鹏2. 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[J]. 岩石力学与工程学报, 2017, 36(S2): 4102-4112.
LI Biao 1，XU Nuwen2，DAI Feng2，GU Gongkai3，LIU Ke3，GUO Liang2，JIANG Peng2. Microseismic monitoring and large deformation forecasting research during excavation of underground powerhouse at Wudongde hydropower station. , 2017, 36(S2): 4102-4112.

链接本文:

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

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