摘要
针对岩爆孕育过程的特征、规律和机制,提出"优化开挖方案减少应力和能量聚集→预释放和转移能量→设计合理的支护参数吸收能量"的岩爆"三步走"防控理论以及在此基础上基于开挖过程中微震信息时空演化的岩爆动态调控理论。在施工过程中,根据实测到的微震信息演化规律进行岩爆等级预警,据此进行反馈分析和动态调控,运用"三步走"防控对策进行及时的开挖速率和支护措施动态调控,以尽可能避免岩爆的发生、降低岩爆发生的等级或延迟岩爆发生的时间。所建议的方法成功地应用于埋深1 900～2 525 m的锦屏二级水电站深埋引水隧洞和排水洞的施工开挖过程中,应用过程和结果验证了所建议方法的适用性。
According to mechanism, characterization and law of rockburst evolution process, a three-step strategy to control rockburst was firstly proposed. It includes the first step to optimize excavation schemes to reduce concentration of stress and energy induced by the excavation; the second step to pre-release and transfer energy concentration; and the third step to absorb energy stored in rock mass by designing reasonable rockbolts and other support types. And then a dynamic control method of rockburst evolution process is proposed. During the construction, the real-time microseismicity monitoring is used to perform warning of rockburst. The feedback analysis and dynamic control strategy if needed can be conducted to perform the three-step control strategy of rockburst evolution process. The proposed method has been successfully used in Jinping II deep headrace and water drainage tunnels with depths of 1 900 - 2 525 m. The practice verified the applicability of the proposed method.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第10期1983-1997,共15页
Chinese Journal of Rock Mechanics and Engineering
关键词
岩石力学
岩爆
孕育过程
动态调控
微震
rock mechanics
rockburst
evolution process
dynamic control
microseismicity
作者简介
冯夏庭（1964-），男，博士，1986年毕业于东北工学院采矿工程专业，现任研究员、博士生导师，主要从事岩石力学智能分析方法及其应用方面的教学与研究工作。E—mail：xtfeng@whrsm．ac．cn
