摘要
某水电站导流洞断裂大都为层面裂隙和顺层断层,其隧洞进口和洞室中部存在软弱夹层,围岩稳定性差。结合资料,对某水电站导流洞建立空间三维微震监测系统,采集微震事件数据,确定微震活动位置以及矩震级,结合现场监测,分析微震活动时空分布特征,研究微震活动用于确定预测围岩破坏等级。研究结果表明,微震事件分布与施工过程、地质条件相关,出现微震事件聚集以及其矩震级较大的情况时,可视为围岩破坏的前兆。
The diversion tunnel faults of a hydropower station are mainly plane cracks and bedding faults. There are weak interlayers at tunnel entrance and in the middle of tunnel, and the surrounding rock is instable. Based on geological data, a three-dimensional microseismic monitoring system was established for the diversion tunnel to collect microseismic event data and determine the location and moment magnitude of microseismic activities. Combined with field monitoring, the spatial and temporal distribution characteristics of microseismic activities were analyzed, and the microseismic activities were studied to determine and predict the failure grade of surrounding rock. The results show that the distribution of microseismic events is related to the construction process and geological conditions. When microseismic events gather and their moment magnitude is larger, it can be regarded as the precursor of surrounding rock failure.The results can provide reference for construction and deformation warning of surrounding rock.
作者
龙海剑
李小强
马建
王治国
李毕
毛浩宇
Long Haijian;Li Xiaoqiang;Ma Jian;Wang Zhiguo;Li Bi;Mao Haoyu(Sinohydro Bureau 7 Co.,Ltd.of Power China,Chengdu 611730,China;College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,China)
出处
《山西建筑》
2023年第4期81-85,共5页
Shanxi Architecture
基金
中国水利水电第七工程局有限公司科研项目(项目编号:2020-690-51-11)。
关键词
微震监测
矩震级
导流洞
围岩失稳预警
microseismic monitoring
moment magnitude
the diversion tunnel
warning of surrounding rock instability
作者简介
龙海剑(1975-),男,高级工程师,从事水利水电工程施工技术及质量管理工作;通信作者:毛浩宇(1995-),男,在读博士,从事微震监测技术方面研究。
