A Microseismic Method for Dynamic Warning of Rockburst Development Processes in Tunnels
A Microseismic Method for Dynamic Warning of Rockburst Development Processes in Tunnels
复制标题
隧道岩爆发展过程动态预警的微震方法
DOI：
10.1007/s00603-014-0689-3
复制
发表时间：
2015-09-01
影响因子：
6.2
通讯作者：
Yu, Yang
中科院分区：
文献类型：
--
作者：
Feng, Guang-Liang;Feng, Xia-Ting;Yu, Yang
岩爆的早期预警仍然是岩石工程中的一个世界性挑战。本文提出了一种基于微震的隧道冲击地压预警方法，以预警和降低隧道内的冲击地压风险。该方法利用实时微地震数据和建立的岩爆预警公式，对隧道开挖过程中的岩爆风险进行动态预警。冲击地压预警公式的建立涉及几个关键环节。其中包括岩爆数据库、典型岩爆案例的选择、微震活动和岩爆之间的函数关系、最佳加权系数和动态更新。利用该方法，可以实时预警不同强度(极强、强烈、中等、轻微和无)的应变和应变结构滑动岩爆的发生概率。该方法已成功应用于锦屏二期工程深埋隧道岩爆预警(D、B洞总长约11.6亿公里)。这一成功说明了所提出的方法的适用性。此外，研究还发现，在岩爆发展过程中，同烈度的应变结构滑动岩爆的微震特征值要大于应变结构滑动岩爆的微震特征。
Early warning of rockbursts remains a worldwide challenge in rock engineering. In this work, a microseismicity-based method of rockburst warning in tunnels is proposed to warn of and reduce the risk of rockburst. The method uses real-time microseismic data and an established rockburst warning formula to provide dynamic warning of rockburst risk during excavation of a tunnel. The establishment of the rockburst warning formula involves several key parts. These include a rockburst database, selection of typical rockburst cases, functional relationships between microseismicity and rockbursts, optimal weighting coefficients, and dynamic updating. By using the proposed method, the probability of strain and strain-structure slip rockbursts of different intensity (extremely intense, intense, moderate, slight, and none) can be warned of in real time. The method has been successfully applied to rockburst warning in deeply buried tunnels at the Jinping II hydropower project (about 11.6 km in total for D & B tunnels). This success illustrates the applicability of the proposed method. In addition, it is found that during the rockburst development process, the microseismic eigenvalues for strainbursts are bigger than in strain-structure slip rockbursts of the same intensity.