泸定水电站浅埋覆盖层开挖支护施工技术  

Construction Technology of Excavation and Support for Shallow Overburden of Luding Hydropower Station

作　　者：任喜军 杨芳 REN Xi-jun;YANG Fang(PowerChina Zhongnan Engineering Corporation Limited,Changsha 410000,China)

机构地区：[1]中国电建集团中南勘测设计研究院有限公司,长沙410000

出　　处：《工程建设与设计》2021年第15期114-116,共3页Construction & Design for Engineering

摘　　要：地下工程开挖施工中,覆盖层厚度直接影响作业安全性,覆盖层浅,则施工难度大、安全风险较高,极易出现冒顶、塌方等事故,地表沉降较难控制,对此合理选择开挖支护施工技术十分关键。论文就2#泄洪洞浑水沟段浅埋覆盖层的开挖支护施工技术的介绍,说明对于浅埋覆盖层,地下水丰富的V类围岩,采用超前灌浆+小导管注浆支护+钢格栅支护的施工技术可行,对于提高围岩的稳定能力是有明显效果,对类似工程具有较高的参考价值。In the excavation construction of underground engineering,the thickness of overburden layer directly affects the operation safety.If the overburden layer is shallow,the construction is difficult and the safety risk is high.It is very easy to have roof fall,collapse and other accidents,and the surface settlement is difficult to control.Therefore,it is very important to reasonably select the excavation support construction technology.This paper introduces the construction technology of excavation and support of shallow overburden in Hunshuigou section of 2 flood discharge tunnel.It shows that for the shallow overburden and class V surrounding rock with rich groundwater,the construction technology of advanced grouting+small pipe grouting support+steel grid support is feasible,which has obvious effect on improving the stability of surrounding rock and has high reference value for similar projects.

关 键 词：浅埋覆盖层 超前灌浆 小导管注浆 预支护 施工技术 

分 类 号：TV271.1[水利工程] TV731