摘要
采用加拿大ESG微震监测系统对锦州某大型地下水封石油洞库局部开挖过程进行实时监测和分析,圈定监测范围内围岩潜在危险区域,再现开挖过程中洞库失稳区域的岩体微破裂萌生、发展和集聚。结果表明：（1）采用人工定点敲击试验对监测系统定位性能进行测试,确定研究区域岩体整体等效P波波速为5 200 m/s,传感器阵列范围内的震源定位误差小于8 m;（2）监测区域岩体微破裂呈2个条带状聚集,一条位于水幕巷道6东侧,水幕巷道1和2范围,与水平面呈缓倾角。另一条位于储油洞室1北与1南范围2＋40～2＋60里程区域内,与该区域辉绿岩脉分布范围一致,说明微震监测系统可以查明判别岩脉等软弱结构面情况。这是由于大断面的储油洞室的强开挖卸荷,高能量的释放导致岩脉的＂过度＂损伤,从而诱发大量的微破裂。研究结果证明微震监测技术在地下水封石油洞库这种特殊岩体结构中应用的可行性,为后期大规模微震监测系统的构建与实施提供参考依据。
The real-time monitoring and analysis of the microseismic activities of the cave rocks of a large underground water-sealed oil storage cavern in Jinzhou during the disturbance caused by strong excavation were performed using the Canadian ESG monitoring system. The potential failure regions of the cave rocks within the scope of monitoring were identified. The initiation, development and agglomeration process of the rock micro-cracks during excavation were reproduced. The P wave velocity was determined to be 5 200 m/s with the error of source location less than 8 m within the scope of the sensor array. Micro-cracks of rocks within the scope were aggregated into two bands. One was located to the east of water curtain tunnel 6,in between the water curtain tunnels 1 and 2,and had a low angle with the horizontal plane. The other was located in 2＋40-2＋60 mileage between the oil storage grotto 1-North and 1-South,and shared the same distribution with the diabase dikes in the region. The microseismic monitoring system identified the condition of the weak structural surface like dikes. The strong excavation disturbance of the large section oil storage caverns and the release of large amount of energy led to the＂over damage＂of rock and resulted in a large number of micro-cracks. The research results proved the feasibility of applying the microseismic monitoring technology in the special rock mass structures like underground water-sealed oil storage caverns.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2016年第7期1353-1365,共13页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51504233)
国家重点基础研究发展计划(973)项目(2014CB047100)
中国博士后科学基金资助项目(2015M 571137)~~
关键词
岩石力学
地下水封石油洞库
开挖卸荷
微震监测
能量释放
rock mechanics
water sealed underground oil storage caverns
excavation disturbance
microseismic monitoring
energy release
