深埋隧洞不同掘进方式下即时型岩爆微震对比分析  

Contrastive Analysis of Microseismic Events for Immediate Rockburst in Deep Tunnels with Different Excavation Methods

作　　者：于洋[1] 冯夏庭[1] 陈天宇[1] 陈东方[1] 

机构地区：[1]东北大学深部金属矿山安全开采教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2014年第3期429-432,共4页Journal of Northeastern University(Natural Science)

基　　金：国家重点基础研究发展计划项目(2010CB732006)

摘　　要：对某水电站引水洞和施工排水洞钻爆法及TBM开挖段的施工过程进行连续性实时微震监测，将即时型岩爆孕育及发生过程中获得的微震信息进行了对比分析．结果表明：深埋硬岩地下隧洞即时型岩爆的孕育及发生过程中，微震事件在空间位置上从初始的不规则零散分布不断向岩爆区域集合，并且数量不断增加；累计微震释放能以及塑性体积的平均微震释放能均不断增大，TBM开挖过程中岩体能量释放要大于钻爆法开挖；TBM开挖强烈岩爆发生前有轻微～中等岩爆伴随发生并且随着岩爆的孕育过程而逐渐递增，而钻爆法开挖不具有这一现象．Based on continuous and real-time microseismic monitoring for construction process of diversion tunnels and drain tunnels in a hydropower station, the microseismic information of tunnels excavated by drill-and-blast method and tunnel boring machine （TBM） were compared and analyzed. The results show that duirng the preparation and germination of immediate rockbursts in deep-buried tunnel excavation, the distribution of microseismic events and energy release gradually convert from discrete to relatively concentrative mode in spatial domain, and the number of microseismic events increases obviously. Accumulated re/eased energy of microseismic events and average released energy of plastic volume increase. Energy release of tunnels excavated by TBM is bigger than that by drill-and-blast method. Before the occurrence of strong rockbursts, there are a lot of mild and moderate rock bursts in the excavation by TBM, which is not found in drill-and-blast method excavation.

关 键 词：钻爆法 TBM 即时型岩爆 微震事件 岩爆区域 

分 类 号：TU45[建筑科学—岩土工程]