摘要
针对锦屏二级水电站深埋引水隧洞开挖卸荷引发的岩爆问题,通过数值模拟研究了洞壁围岩卸荷范围和卸荷程度对岩爆的影响效应。研究结果表明:随着围岩卸荷范围和卸荷程度的增大,潜在的岩爆动力源区逐步向围岩深部转移,发生岩爆的可能性进一步减小。相比较而言,围岩的卸荷程度比围岩的卸荷范围对岩爆的影响效果更为显著。研究成果为深部地下工程岩爆防治提供了理论依据。
In view of the rock bursts caused by excavation unloading in the deep diversion tunnel of Jinping Ⅱ hydropower station,we carried out numerical simulation to research the effects of unloading range and unloading degree of surrounding rock on rock burst.Research indicates that the potential power source zone of rock burst gradually transfers to the deep and the probability of rock burst is further reduced when the unloading range and unloading degree increase.Moreover,the impact of unloading degree on rock burst is more significant than that of unloading range.The research provides theoretical foundation for preventing rock burst in deep underground projects.
出处
《长江科学院院报》
CSCD
北大核心
2014年第11期120-124,共5页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学基金项目(51204025)
国家重点基础研究发展计划973项目(2011CB710603)
中央级公益性科研院所基金项目(CKSF2013033
CKSF2014064)
关键词
岩石力学
开挖卸荷
切缝局部应力解除
岩爆
rock mechanics
excavation unloading
slit local stress relieving
rock burst
