浅埋大跨度双连拱隧道施工数值模拟研究  

Numerical Simulation Analysis of Large-Span Double-Arch Tunnel with Shallow-Buried Excavation

作　　者：王帅[1] 孙少锐[1] Wang Shuai;Sun Shaorui(School of Earth Sciences and Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学地球科学与工程学院,南京211100

出　　处：《河南科学》2016年第7期1114-1119,共6页Henan Science

基　　金：国家自然科学基金项目(41002089)

摘　　要：以苏州凤凰山大跨度双连拱隧道工程为例,采用有限元软件对多工序开挖条件下双连拱隧道围岩应力场、位移场的变化及初期支护的受力情况进行了详细的分析.通过分析得出,中隔墙顶部及拱腰处围岩存在应力集中的现象;中隔墙中间部位应力最大.竖向位移在主洞拱顶和拱底较大.通过现场实测,测得拱顶沉降随开挖工序的变化趋势,将理论分析结果与实测结果进行对比分析,结果表明,数值模拟得出的拱顶沉降与实测结果基本是一致,由此证明,数值模拟结果能真实反应现场隧道围岩的应力应变状态随开挖步骤的变化趋势.Taking the Phoenix Mountain large-span double-arch tunnel in Suzhou as an example,the analysis of the surrounding rock stress,deformation and the mechanics model of initial support under different construction stages was conducted by using finite element software. The consequences show that the surrounding rock stress is concentrated on the top of the middle wall,the maximum of stress is located on the center of the middle wall,and the verticle displacement is mainly occurred at the top and bottom of the main tunnels. Based on the field measurement,the changing tendency of in- situ vault settlement was obtained during the excavation process.Comparing the numerical simulation consequences with the measured consequences,the results show that the calculated vault settlement is largely consistent with the in-situ vault settlement,which proves that the simulation results actually reflect the tend of stress-strain state in the excavation process

关 键 词：围岩稳定性 双连拱隧道 数值模拟 监测数据 

分 类 号：U455.411[建筑科学—桥梁与隧道工程]