深埋大断面公路隧道开挖方法数值模拟分析  

Simulating Analyses for Excavation Methods of Deep Buried Large-section Highway Tunnels

作　　者：陈雪峰[1] 姚晨晨[1] 赵杰[1] 

机构地区：[1]大连大学土木工程技术研究与开发中心,辽宁大连116622

出　　处：《公路工程》2015年第3期152-156,共5页Highway Engineering

基　　金：辽宁省教育厅(2012-0102517);大连市科学技术基金(2010J21DW013)

摘　　要：依托大连南部滨海大道东端桥隧建设工程,利用大型有限差分软件FLAC3D建立三维公路隧道模型,分别采用三台阶预留核心土法、导洞法、单侧壁导坑法和双侧壁导坑法模拟深埋大断面公路隧道的开挖过程,详细分析隧道开挖支护后围岩的位移场、应力场、锚杆轴力和塑性区分布。数值模拟结果表明:综合比较4种开挖方法,双侧壁导坑法开挖过程位移变化和锚杆受力最小,受力更加均匀,塑性区分布范围较小,更有利于维持围岩的稳定性。最终确定双侧壁导坑法为该工程较合理的开挖方法,为类似的大断面公路隧道的设计和施工提供了必要的参考依据。Based on the bridge and tunnel construction project located in eastern of Binhai road,south of Dalian,finite difference software FLAC3 D is utilized to establish three-dimensional numerical models. Different construction methods are used to simulate highway tunnel excavation processes,which include triple-bench with reserved core method,pilot heading method,single side heading method and double side drift method. The displacement field,stress field and the bolt axial force of the tunnel are analyzed after excavation and support. Comprehensive comparison of four kinds of excavation methods,numerical simulation results show that double side drift method is more conducive to the stability of surrounding rock of maintenance. Owing to the smallest displacement and axial forces of bolts,plastic zone distribution range and more uniform force,double side drift method is definitely determined to the most reasonable excavation method for the project. The necessary reference is provided for the design and construction of similar large section highway tunnels.

关 键 词：大断面 公路隧道 开挖方法 数值模拟 双侧壁导坑法 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]