摘要
Abstract
The construction area of underground powerhouse in Liyang Pumped-storage Power Station has a complex geological conditions and abundant groundwater, so the stability of surrounding rocks of underground caverns, especially of the crown arch, is the key of excavation. By advanced groundwater lowering, crown arch's pre-consolidation grouting and advanced geological exploration, the self stability of surrounding rock is improved. The principle of "Short footage, weak blasting and strong support" is strictly implemented in crown arch excavation which is conducted according to the procedures of arch anchor cable drilling, displacement meter installation, pilot tunnel excavation and support at two sides, middle pier excavation and support, system anchor cable installation and arch—foot pre—stressed anchor installation. The safety monitoring results indicate that the deformation of surrounding rock in construction is effectively suppressed and the security of crown arch is in a controlled state. The arch excavation completes two months in advance which is a good result of underground powerhouse excavation under adverse geological conditions.关键词
地下厂房/顶拱/开挖/支护/溧阳抽水蓄能电站Key words
underground powerhouse/ crown arch/ excavation/ support/ Liyang Pumped-storage Power Station分类
建筑与水利
