四车道隧道双侧导坑钢架岩墙组合支撑施工技术

作者：肖凯锋¹,吕保中¹,杨建辉²

作者简介：

肖凯锋,高级工程师,E⁃mail: 253733787@ qq. com

作者单位：

1. 浙江交工金筑交通建设有限公司,浙江杭州 310051; 2. 浙江科技大学,浙江杭州 310023

基金项目：

∗浙江省重点研发计划(2021C01131)

摘要：

四车道公路隧道开挖断面大,选择合理的分部开挖工法是实现围岩稳定和提高工效的重要途径. 依托杨家山隧道分析了传统双侧壁导坑施工方法存在的问题,提出了双侧导坑钢架岩墙组合支撑施工方法. 实践表明,该方法充分发挥了杨家山隧道硬岩地基承载力高的优势,利用下台阶岩墙形成钢架⁃岩墙组合支撑体系,形成了“拱墙初支⁃仰拱横撑⁃岩墙⁃临时钢架”构成的双侧闭环结构;双侧壁上台阶临时钢架拆除后,“拱墙初支⁃仰拱横撑⁃岩墙”整体环状受力结构仍然发挥支撑作用. 该方法优化了传统双侧壁导坑施工工艺和步序,解决了原设计存在的各部施工时的相互干扰;该方法不必安装下部临时钢架,减少了临时钢架安拆工作量.

关键词：隧道;围岩;开挖;支撑;临时钢架;中岩墙

English：

The excavation section of the four⁃lane highway tunnel is large, and the selection of areasonable partial excavation method is an important way to achieve the stability of the surrounding rockand improve the efficiency. Based on the engineering practice of the Yangjiashan Tunnel Project, theproblems existing in the traditional construction method of double side heading are analyzed, and theconstruction method of double side heading steel frame rock wall combined support is proposed. Theengineering practice has shown that this method gives full play to the advantages of the high bearingcapacity of hard rock foundation of the Yangjiashan Tunnel. The steel frame⁃rock wall composite supportsystem was formed by using the lower step rock wall, and the bilateral closed⁃loop structure of “arch wallinitial support⁃inverted arch transverse support⁃rock wall⁃temporary steel frame” was formed. After theremoval of the temporary steel frame on the upper steps of the double side walls, the overall annular forcestructure of “arch wall initial support⁃inverted arch transverse support⁃rock wall” still played a supportingrole. This method optimizes the construction technology and steps sequence of the traditional double⁃sidedwall guide pit, and solves the mutual interference of each part in the original design during construction.This method needs no installation of the lower temporary steel frame, which reduces the workload oftemporary steel frame installation and disassembly.

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