白鹤滩水电站左岸地下厂房复杂地质条件下大跨度顶拱开挖施工技术  

Study on Excavation Technology of Large-span Arch-crown of Underground Powerhouse on Left Bank of Baihetan Hydropower Station under Complicated Geological Condition

作　　者：曾强[1] ZENG Qiang(Sinohydro Bureau 7 Co., LTD, Chengdu, Sichuan, 610213)

机构地区：[1]中国水利水电第七工程局有限公司,四川成都610213

出　　处：《四川水力发电》2021年第6期28-32,共5页Sichuan Hydropower

摘　　要：白鹤滩水电站左岸地下厂房顶拱开挖跨度大,地质条件复杂,围岩变形控制难度大。为解决大跨度地下厂房顶拱围岩稳定问题、保障施工质量和安全以及后续施工的顺利进行,从控制应力集中程度和爆破规模、利于支护跟进和施工组织等多角度出发对多种施工方案进行了综合评估,最终提出了大跨度顶拱开挖新方法,并且针对施工过程中出现的特殊问题采取了有针对性的处理措施,取得了较好的效果。Excavation span of the arch-crown of the underground powerhouse on the left bank of the Baihetan Hydropower Station is large,the geological conditions are complex,and the deformation control of surrounding rock is difficult.In order to ensure stability of the surrounding rock of the arch-crown of the large-span underground powerhouse,to ensure construction quality,safety and to carry out the follow-up construction smoothly,a new method of large-span arch-crown excavation is put forward based on comprehensive evaluation of various schemes from the aspects of controlling the degree of stress concentration and blasting scale,facilitating follow-up support and construction organization.Countermeasures are taken to tackle the special problems met during construction and good results are achieved.

关 键 词：复杂地质条件 大跨度 顶拱 开挖 新方法 白鹤滩水电站 

分 类 号：TV7[水利工程—水利水电工程] TV554