Microseismic monitoring and stability analysis for the large-scale underground caverns at the Wudongde hydropower station
Microseismic monitoring and stability analysis for the large-scale underground caverns at the Wudongde hydropower station
复制标题
乌东德水电站大型地下洞室微震监测及稳定性分析
DOI：
10.1007/s10064-020-01777-z
复制
发表时间：
2020-03-17
影响因子：
4.2
通讯作者：
Ke, Wei
中科院分区：
文献类型：
--
作者：
Li, Biao;Xu, Nuwen;Ke, Wei
为了分析乌东德水电站地下洞室开挖岩体的稳定性，采用了高分辨率微震（MS）监测系统。基于MS事件的时间演化特征，建立了施工状态与MS活动之间的关系。将MS事件的空间演化特征与传统监测、地质调查和现场观测相结合，识别出几个主要损伤区域，揭示了造成岩体损伤的关键因素。进一步系统分析了岩体大变形过程中MS源多参数的演化规律。岩体发生大变形前，MS源多参数表现不同，包括MS事件数明显增加、能量指数急剧增加且视体积逐渐增加、中心频率呈下降趋势。本研究表明，采用MS监测、传统监测、地质调查和现场观测相结合的综合分析方法，可以更好地了解开挖围岩体的行为，对于大型地下洞室岩体变形破坏的风险管理具有重要意义。
To analyse the stability of rock mass subjected to excavation of the underground caverns at the Wudongde hydropower station, a high-resolution microseismic (MS) monitoring system was applied. Based on the temporal evolution characteristics of MS events, the relationship between construction state and MS activity was established. Combining the spatial evolution characteristics of MS events with traditional monitoring, geological survey and field observation, several main damage regions were identified and the key factors causing rock mass damage were revealed. Furthermore, the evolution laws of MS source multi-parameters during the large deformation of rock mass were systemically analysed. Prior to the large deformation of rock mass, the MS source multi-parameters behaved differently, including an obvious increment of the number of MS events, a sharp increment of the energy index with a progressive increment of the apparent volume and a decreasing trend of the centre frequency. The present study reveals that the integrated analytical method incorporating MS monitoring, traditional monitoring, geological survey and field observation leads to a better understanding of the behaviour of surrounding rock mass subjected to excavation, which is of great significance for the risk management of rock mass deformation and failures in the large-scale underground caverns.