拉西瓦水电站高地应力区特大地下厂房开挖施工技术

Excavation Technique of Extra-huge Undergrouned Powerhous in the Area With High Terrestrial Stress of Laxiwa Hydropower Station

拉西瓦水电站地下厂房厂区地应力高、地质条件较复杂,特大厂房与众多洞室的立体交叉,增加了厂房特别是高边墙的施工难度,围岩稳定和快速施工是本工程的难点和重点。该地下厂房的施工方法、施工程序、爆破参数,可为以后同类工程施工提供一定的经验和借鉴。

The site of underground powerhouse of Laxiwa Hydropower Station is located in an area with high terrestrial stresses and complex geological conditions. The grade separation of huge powerhouse and many caverns increases the construction difficulty of the powerhouse especially the high sidewall, so that the stability of surrounding rock mass and quick construction are the difficulty and importance of this project. This paper describes the construction method, subse-quenee and blasting parameters adopted in the underground powerhouse, which can provide certain experience and reference for other similar project in future.