玉瓦水电站引水隧洞爆破开挖损伤特性研究  

Study on damage characteristics of diversion tunnel induced by blasting excavation for Yuwa Hydropower Station

作　　者：钟权[1] 彭峥[1] 刘放[1] 

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《人民长江》2016年第23期102-106,125,共6页Yangtze River

摘　　要：以玉瓦水电站引水隧洞的钻爆开挖为例,选取一典型开挖断面,利用三维动力有限元数值软件(LSDYNA)模拟分析了隧洞围岩在爆破开挖过程中的损伤演化过程,重点研究了围岩中实际存在的节理面以及初始地应力场对于爆破损伤演化特性的影响。研究结果表明:爆破开挖过程中,垂直于节理面方向上的损伤受到了抑制,而平行于节理面方向上的损伤被加剧;在较低地应力条件下,初始地应力场有助于减弱爆破损伤的发展。The diversion tunnel of Yuwa Hydropower Station is excavated with drilling and blasting method, taking one typical excavation section as the research object, the damage evolution process of surrounding rock is simulated and analyzed based on LS -DYNA numerical software, especially the effect on blasting damage evolution property induced by joint surface and initial ground stress. The simulation results show that during blasting excavation process, the damage perpendicular to joint surface is weakened, while the damage parallel to joint surface is intensified. Initial ground stress contributes to weakening the development of blasting damage when the ground stress is low.

关 键 词：爆破开挖 岩体损伤 节理 地应力 引水隧洞 

分 类 号：TV67[水利工程—水利水电工程]