岩土力学2011，Vol.32Issue(10)：3111-3118,8.
深埋隧洞极强岩爆段隧道掘进机半导洞掘进岩爆风险研究
Rockburst risk of tunnel boring machine part-pilot excavation in very strong rockburst section of deep hard tunnel
摘要
Abstract
Tunnel boring machine(TBM) should face the risk of very strong rockburst directly in intact and brittle rock mass section with ultrahigh stress concentration for full-face excavation in deep tunnel; then safety of equipment and personnel will be under great threat. The excavation test through "part-pilot heading + TBM" is carried out in the diversion tunnel #3 of the Jinping II hydropower station and the rockburst risk of TBM part-pilot excavation is researched via real-time microsesimic monitoring. The results show that: (1) The daily number of microseismic events, the daily accumulative radiated seismic energy, number of big events and frequency and strength of rockburst in the field during part-pilot excavation are far lower than in the period of full-face advance. (2) The time domain evolution of logarithm of energy index and accumulative apparent volume indicates that the risk of strong rockburst in part-pilot section is smaller; and the excavation in field also proved this. (3) In comparison to full-face advance, the degree of concentration, number, magnitude and radiated energy of microseismic events in space in section of part-pilot are far lower. Therefore, the rockburst risk of TBM for part-pilot driving is more less than for full-face advance. In very strong rockburst section, when construction condition is indispensable, the part-pilot can be excavated in advance and then TBM pass, the risk of rockburst can be controlled availably.关键词
深埋隧洞/隧道掘进机(TBM)/半导洞/极强岩爆/微震监测/锦屏Ⅱ水电站Key words
deep tunnel/ tunnel boring machine/ part-pilot/ very strong rockburst/ microseismic monitoring/ Jinping II hydropower station分类
数理科学引用本文复制引用
肖亚勋,冯夏庭,陈炳瑞,丰光亮,张照太,明华军..深埋隧洞极强岩爆段隧道掘进机半导洞掘进岩爆风险研究[J].岩土力学,2011,32(10):3111-3118,8.基金项目
国家973项目资助(No.2010CB732006) （No.2010CB732006）
国家自然科学基金项目资助(No.50909092) （No.50909092）
湖北省自然科学基金项目资助(No.2009CDB120). （No.2009CDB120）
