岩土工程学报Issue(12)：2315-2322,8.DOI:10.11779/CJGE201412021
基于微震监测的锦屏二级水电站深埋隧洞岩爆孕育过程分析
Nucleation process of rockbursts based on microseismic monitoring of deep-buried tunnels for Jinping Ⅱ Hydropower Station
摘要
Abstract
To study the rockburst nucleation and evolution process in deep-buried tunnels for JinpingⅡHydropower Station, a microseismic real-time monitoring system is established to monitor diversion tunnel No. 3 during TBM excavation. Based on a great deal of microseismic monitoring data, the characteristics of spatiotemporal distribution, activity rate, exhausted energy, energy density and apparent volume of microseim are comprehensively considered before occurrence of rockbursts. What’s more, the initiation, propagation, extension and inter-coalescence mechanisms of microcracks during progressive nucleation process of rockbursts at Jinping Ⅱ Hydropower Station are revealed. The spatial relationship between evolution rules of microseismic activities and rockbursts is discussed. The monitoring results show that precursory microcracking exists prior to most rockbursts, which can be captured by the microseismic monitoring system. The event rate, microseismic released energy and accumulated apparent volume have their different increase tendencies before rockbursts. The energy source of some rockbursts is composed of local energy and transfer energy, namely Edrive source=Elocal+Etransfer, and a portion of rockbursts can be induced by certain adjacent violent rockbursts at the same time. It is feasible to monitor and predict rockburst events by using the microseismic monitoring technology for deep-buried tunnels.关键词
岩爆/微震监测/微震活动/孕育过程/锦屏二级水电站Key words
rockburst/microseismic monitoring/microseismic activity/nucleation process/JinpingⅡHydropower Station分类
建筑与水利引用本文复制引用
于群,唐春安,李连崇,李鸿,程关文..基于微震监测的锦屏二级水电站深埋隧洞岩爆孕育过程分析[J].岩土工程学报,2014,(12):2315-2322,8.基金项目
国家重点基础研究发展计划（973计划）项目（2014CB047100,2011CB013503）；国家自然科学基金项目（51279024）；国家自然科学基金委创新研究群体基金项目 （）
