大断面引水隧洞Ⅲ_(2)类不良地质围岩段安全快速施工  

Safe and Fast Construction of Large Section Headrace Tunnel in Unfavorable Geological Condition of ClassⅢ_(2)

作　　者：李萌 朱亚强 袁鹏 孙志敏 LI Meng;ZHU Yaqiang;YUAN Peng;SUN Zhimin(Sichuan Huaneng Luding Hydropower Co.,Ltd.,Luding Sichuan 626100;The Second Engineering Co.,Ltd.of China Railway 12th Bureau Group,Luding Sichuan 626100)

机构地区：[1]四川华能泸定水电有限公司,四川泸定626100 [2]中铁十二局集团第二工程有限公司,四川泸定626100

出　　处：《四川水力发电》2023年第1期133-136,共4页Sichuan Hydropower

摘　　要：Ⅲ_(2)围岩根据围岩岩性和整体强度判断,围岩强度高,拥有足够的自稳能力,施工过程中由于裂隙不利组合切割和裂隙面存在绿泥化面蚀变等因素,导致不稳定岩体隐蔽性很高,偶有大块体围岩掉落,安全风险较高,为保证不良地质段落安全快速施工,采用随机支护、钢支撑临时支护、中导洞法开挖、降低开挖高度、缩短开挖进尺、爆破后充分排危等措施,降低安全风险,保证地下洞室开挖稳步推进。According to the lithology and overall strength,the surrounding rock of ClassⅢ_(2)has high strength and sufficient self-stability.During the construction process,due to the factors such as unfavorable combination of joints and the presence of the altered chlorite surface,unstable blocks has high concealment,and occasionally large block fall.In order to ensure the safe and rapid construction of sections under adverse geological conditions,measures such as random support,temporary steel support,middle pilot tunnel excavation and shortening the excavation footage and fully removing hazards after blasting are adopted.In this way,the safety risks are reduced and the steady progress of underground cavern excavation is ensured.

关 键 词：安全快速施工 Ⅲ_(2)类不良地质 临时支护 

分 类 号：TV554[水利工程—水利水电工程]