分岔隧道施工三维数值仿真模拟研究  

A Study on 3D Numerical Simulation of Branch Tunnel Construction

作　　者：胡剑兵[1] 褚以惇[1] 乔春江[1] 杨林松[1] 曹传林[2] 

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉市430056 [2]湖北沪蓉西高速公路建设指挥部,恩施市445000

出　　处：《公路》2009年第3期193-199,共7页Highway

摘　　要：分岔隧道是一种新的隧道建设型式,它一般由四车道大拱隧道或连拱隧道逐渐过渡到上下行分离式双洞隧道,因此它同时具备标准间距的分离隧道、小净距隧道、连拱隧道以及四车道大拱隧道等多种结构型式隧道的特点。结构型式一般分为大跨衬砌段、双连拱衬砌段、加强衬砌段和一般衬砌段4种断面型式。作为一种新的隧道建设型式,目前国内尚不多见,缺乏可供参考的设计、施工经验。由于分岔隧道型式的特殊性和复杂性,施工难度和风险均较大,因此,研究施工围岩的稳定性有着非常重要的意义。本文基于连续介质模型,通过大型有限元软件ABAQUS,主要对施工过程进行数值仿真模拟,着重分析研究大拱与连拱过渡段和连拱以及小净距过渡段施工过程中的围岩变形和破坏特性,并得出结论,为设计施工提供参考依据。The branch tunnel is one kind of new tunnel construction pattern, it generally does a graduall transition from four traffic lanes big arch tunnel or the multi-arch tunnel to the about good separation formula double-arch tunnel, therefore it simultaneously has the many kinds of structures pattern tunnel characteristics such as the standard spacing separation tunnel, the small spacing tunnel, the multi-arch tunnel as well as four traffic lanes big arch tunnel and so on. The structure patterns are generally divided into 4 kind of cross sections patterns, such as the greatly cross lining work section, the double-arch the lining work section, the strengthening lining work section and the general lining work section As one kind of new tunnel construction pattern, the reference for the design and the construction experience are lacked. As the particularity and the complexity of the branch tunnel pattern, the construction is difficulty and the risk is bigger, therefore, studing the stability of its construction adjacent formation has much significance. Based on the continuous medium model, through large-scale finite element software ABAQUS, the numerical simulation to the construction process are mainly carried on, the adjacent formation distortion and the destruction characteristics of the big arch to multi-aich transitional section and muti-arch as well as the small spacing transitional section in construction process are mainly analyzed and studied, and the conclusions are got, and the reference for the design and construction is provided.

关 键 词：分岔隧道 数值模拟 数值仿真 有限元 

分 类 号：U455[建筑科学—桥梁与隧道工程]