基于微震监测的地下水封石油洞库施工期围岩稳定性分析

发布时间：2018-04-02 20:07

本文选题：岩石力学　切入点：地下水封石油洞库　出处：《岩石力学与工程学报》2016年07期

【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。
[Abstract]:The local excavation process of a large underground water seal oil reservoir in Jinzhou is monitored and analyzed in real time by using Canada ESG microseismic monitoring system to delineate the potential dangerous area of surrounding rock in the monitoring range.It reappears the initiation, development and accumulation of rock mass microfracture in the unstable region of cavern during excavation.The results show that the performance of the monitoring system is tested by manual fixed point percussion test.It is determined that the whole equivalent P wave velocity of the studied rock mass is 5 200 m / s, and the focal location error in the sensor array is less than 8 m / m ~ (2)) the microfracture of the rock mass in the monitoring area is clustered in two bands, one is located on the east side of the water curtain tunnel,The range of water curtain roadway 1 and 2 shows a gentle dip angle with horizontal plane.The other is located in the mileage range of 240 ~ 2 60 miles in the north and south of oil storage chamber 1, which is consistent with the distribution range of diabase veins in this area, which indicates that the microseismic monitoring system can be used to identify the weak structural planes such as the veins.This is due to the strong excavation and unloading of oil storage caverns with large sections, and the release of high energy, which leads to "excessive" damage to the veins and thus induces a large number of micro-fractures.The results show that the application of microseismic monitoring technology to the underground water seal oil reservoir is feasible, which provides a reference for the construction and implementation of the large-scale microseismic monitoring system in the later stage.
【作者单位】：中国科学院力学研究所;大连力软科技有限公司;大连理工大学岩石破裂与失稳研究中心;廊坊中油朗威工程项目管理有限公司;四川大学水利水电学院;
【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)~~
【分类号】：TE822

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