百色水利枢纽地下厂房关键技术研究

Key technology research for underground powerhouse of Baise Multipurpose Dam Project

百色水利枢纽地下厂房的布置存在厂房上游边墙距上游蚀变带很近,且主变洞与主机洞之间岩柱厚度小,主变尾上覆岩体厚度不足,辉绿岩裂隙发育,洞室轴线走向与岩层走向一致,与地应力方向正交,厂前地下水凹槽对洞室上游边墙形成较大的渗透压力等问题。介绍了地下厂房总体布置方案,大跨度、浅埋深、小间距洞室群围岩稳定性,地下厂房围岩块体稳定性,地下厂房岩锚梁方案,地下厂房渗控方案及"四合一"尾水系统等关键技术研究的主要成果。

The arrangement of underground powerhouse of Baise Multipurpose Dam Project had seen much difficulties such as the powerhouse upstream wall being very close to the alteration zone, thin rock column between main unit room and main transformer room, insufficient covering rockmass thickness above main transformer room and tail gate room, developed fissure in diabase, axis of caves being parallel to strata trend and perpendicular to ground stress direction, groundwater groove rendering considerable seepage pressure on upstream wall. An introduction was made on the general arrangement of underground powerhouse, based on which the author presented major research achievements of key technology including the surrounding rock stability of caves with large span, shallow embedding depth and small spacing, the surrounding rock block stability; the rock anchor beam and seepage control design of underground powerhouse ; the four-to-one tail water system.