断层破碎带施工技术在锦屏电站专用公路大坪子隧道施工中的运用  

Application of Construction Technology in Fault Fracture Zones in Dapingzi Highway Tunnelfor Jinping Hydropower Station

作　　者：钟毅[1] 蹇云[2] 

机构地区：[1]中国人民武装警察部队水电十一支队,四川成都610036 [2]中国水利水电第五工程局五分局,四川南充437000

出　　处：《四川水力发电》2005年第B12期63-65,共3页Sichuan Hydropower

摘　　要：锦屏电站专用公路大坪子隧道岩体为钾长花岗岩,岩体完整性较好,表层为块碎石土,但隧道埋深较浅,偏压严重,进洞口段边坡表面覆盖有较厚的坡崩冲积块碎石土,成型进洞困难。详细叙述了大坪子隧道进洞过程中采用超前注浆小导管、管棚钢架超前支护等断层破碎带施工技术,并对开挖方法及初期支护作了简要介绍。Dapingzi highway tunnel is located in sound potash granite covered by debris.The overburden of the tunnel is relatively thin and the bias is great. In entrance zone,slope surface is covered with thick deluvial,colluvial,alluvial debris,resulting in difficult tunneling condition.The paper gives detail description on application of construction technology in fault fracture zones in tunneling of Dapingzi tunnel entrance section,including grouting with small ducts in advance and supporting with large pipe shelf in advance.Brief introduction on excavation method and initial support are presented.

关 键 词：隧道 注浆小导管 大管棚 支护施工方法 锦屏电站 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]