岩土工程学报2017，Vol.39Issue(7)：1206-1215,10.DOI:10.11779/CJGE201707006
深埋隧洞TBM掘进微震与岩爆活动规律研究
Activity laws of microseisms and rockbursts in deep tunnels by TBM tunneling
摘要
Abstract
For the deep tunnel of Jinping Ⅱ Hydropower Station excavated by TBM, based on the seismic monitoring data androckbursts, the temporal and spatial distribution characteristics of microseismic events and rockbursts and evolution laws of microseismicity information during the preparation process of rockbursts are studied. The conclusions are drawn as follows: (1)The active period of microseisms and the peak period of rockbursts are the working time and within one hour after stoppingworking for TBM. The microseismic activity mainly ranges from 3 times the tunnel diameter behind working face to 0.4 timesahead, and its peak value is located at 0.8 times the tunnel diameter behind working face. The rockbursts mainly occur withinthe region 2 times the tunnel diameter behind working face, especially the high-risk zone of rockbursts lies in the region as largeas 1 times the tunnel diameter behind working face. There fore, there is certain space-time relativity between the microseismsand the rockbursts. (2) A sudden increase of microseismic released energy or the steep rise of cumulated apparent volume(CAV) with a sharp drop of Schmidt number in the time sequence is an microseismic anomaly, which is a premonition of rockbursts. (3) The spatial distribution pattern of mircroseismic events shows a trans for mation from random to clump distribution in certain zone with time, and the degree of their clump dispersion pattern gradually increases, simultaneou slyacco mpanied by a growing number of microseismic events with large magnitude and high energy, that is, it is an microseismic anomaly and also a premonition of rockbursts.关键词
岩石力学/深埋隧洞/微震/岩爆/隧道掘进机(TBM)Key words
rock mechanics/deep tunnel/microseismicity/rockburst/tunnel boring machine分类
建筑与水利引用本文复制引用
赵周能,冯夏庭,陈炳瑞..深埋隧洞TBM掘进微震与岩爆活动规律研究[J].岩土工程学报,2017,39(7):1206-1215,10.基金项目
国家自然科学基金国际合作重大项目(41320104005) （41320104005）
国家自然科学基金项目(51479192) （51479192）
西南科技大学博士研究基金项目(14zx7106) （14zx7106）
