摘要
二滩水电站地下厂房系统洞室群规模巨大，其跨度、高度均位居世界前列。由于场区地应力比较高，在开挖期间出现了局部围岩的大变形及岩爆、喷混凝土层剥落等不良现象。对围岩采用系统喷锚支护，局部作加强处理，稳定性良好。工程利用岩体质量Ｑ值确定围岩支护压力，为在设计支护强度方面提供了实例。
Caverns in underground powerhouse complex at Ertan is of a massive scale with the longest span and length in the world.Due to high in situ stress in the powerhouse area,important deformation of local surrounding rock,rock burst,shotcrete spalling occur during excavation.Systematic rock bolt support and shotcrete were carried out for the surrounding rock and reinforcement was done locally for rock stability.Supporting force for surrounding rock is determined by Q value of rock quality.It is an example for design of supporting strength.
出处
《四川水力发电》
1999年第2期24-26,共3页
Sichuan Hydropower
关键词
水电站
地下厂房
围岩变形
喷锚支护
支护强度
Ertan hydropower station,underground powerhouse,high in situ stress,deformation of surrounding rock,rock bolt support and shotcrete,support strength
