摘要
小湾水电站地下厂房规模大,地应力高,与之交叉贯通的洞室多,与其平行布置的主变室之间的岩柱非常薄,尾水支洞与主厂房交叉部位挖空率高,地质条件复杂,高边墙稳定问题突出。如何在保证安全的情况下快速施工,是该工程的难点和重点。小湾水电站地下厂房施工采用了"平面多工序"、"立体多层次"的施工方法;坚持"小洞进大洞,先洞后墙"的原则,加强重点部位的监测和支护;采用控制性弱爆破、设置双预裂面、预留保护层、控制爆破单响药量等技术措施,快速圆满地完成了地下厂房的开挖支护任务。
The underground powerhouse of Xiaowan Hydropower Project is characterized by huge scale, high ground stresses, many cross caverns, thin rock columns between the parallel arranged main transformer cavern and the power- house, thin remaining between the tailrace tunnel and powerhouse, complicated geological conditions and the serious sta- bility of high side walls. The most difficult point of the project is how to execute the excavation work in a safe and fast way. Based on the characteristics of the project, construction methods of multi-sequences and cross-sequences have been applied. In the principle of small tunnels into big ones and priority given to tunnels than walls, monitoring and supporting works for important locations have been strengthened. Controlled blasting have been carried, including double pre-split- ting working faces, reserved excavation layers, and controlling of single charging quantities, etc. By making use of abovementioned methods, the excavation and supporting works for the project have been completed fast and successfully.
出处
《水力发电》
北大核心
2008年第8期43-45,52,共4页
Water Power
关键词
地下厂房
施工技术
小湾水电站
underground powerhouse
construction technology
Xiaowan Hydropower Station
