小净距隧道洞口浅埋偏压段流沙性软弱围岩施工工艺  

作　　者：章文波 

机构地区：[1]中交一公局厦门工程有限公司,福建厦门361000

出　　处：《科技创新与应用》2022年第30期117-121,共5页Technology Innovation and Application

摘　　要：小净距隧道由于中夹岩柱体厚度较薄,使得围岩、支护结构受力复杂,给施工带来更大的困难,围岩极易发生坍塌,易发生安全事故。结合九峰隧道右洞洞口浅埋偏压段流沙性软弱围岩初支加强、超前小管棚及洞顶地表注浆施工工程实例,分析小净距隧道洞口浅埋偏压段流沙性软弱围岩施工工艺。经过工程实践证明,该隧道进洞施工工艺效果良好。Due to the thin thickness of the rock column in the small clear distance tunnel,the force of the surrounding rock and supporting structure is complex,which brings more difficulties to the construction,and the surrounding rock is easy to collapse and prone to safety accidents.Based on the construction examples of strengthening the initial support of flowing sand weak surrounding rock,leading small pipe shed and surface grouting at the top of Jiufeng Tunnel,this paper analyzes the construction technology of flowing sand weak surrounding rock in the shallow buried bias section of Jiufeng tunnel entrance.It is proved by engineering practice that the construction technology of the tunnel is good.

关 键 词：浅埋偏压 小净距隧道 流沙性软弱围岩 坍塌 施工工艺 

分 类 号：U452.12[建筑科学—桥梁与隧道工程]