摘要
与常规应力条件相比,深埋隧洞围岩表现出的力学行为特点显著不同。结合锦屏二级水电站深埋引水隧洞开挖过程中普遍出现的围岩损伤破损现象,针对不同部位围岩应力变化路径,探讨了岩体松弛破坏以及应力集中引起的片帮破坏和岩爆破坏的应力变化特征,并采用数值方法再现了脆性围岩"V"形破坏模式和局部性特征。此外,还对围岩损伤破坏中的尺寸效应和应力路径效应问题进行了探讨。
The mechanics response of surrounding rocks of deep buried tunnels is significantly different from what in conventional condition. On the basis of the occurrences of ground brittle damage observed in the driving of deeply-seated headrace tunnels in Jinping II Hydropower Station, the relation between stress changes and stress-induced ground failures is analyzed and the tress variation paths are investigated by means of numerical modeling approach. The V-notch failure profile are numerically duplicated and it is understood as the result of stress localization near openings. The influence on ground damage of opening size and stress alteration path are also discussed herein.
出处
《水力发电》
北大核心
2014年第7期29-32,85,共5页
Water Power
关键词
深埋隧洞
围岩
损伤破坏
机理
锦屏二级水电站
deep buried tunnel
surrounding rock
damage and failure mechanism
Jinping Ⅱ Hydropower Station
