摘要
在高水压、浅覆土的地层中,盾构隧道往往会出现管片上浮的问题。本文以沅江某越江盾构隧道为研究对象,采用FLAC3D流固耦合计算方法研究盾构隧道同步施工、异步施工、先后施工3种开挖工序对隧道上浮的影响。研究表明:不同施工工序条件下,盾构隧道整体上浮变形表现为在始发端变形较小,随盾构推进,隧道上浮量逐渐增大,管片结构变形均表现为下部管片的上浮变形大于上部;受先施工隧道对未施工隧道围岩应力渗流场的扰动影响,先施工隧道上浮变形小于后施工隧道,且先后施工相隔的距离越大,两者之间的上浮变形相差也越大。
In the stratum with high water pressure and shallow overburden,the shield tunnel often has the problem of segment floating.In this paper,a cross-river shield tunnel in Yuanjiang is taken as the research object,the influence of three excavation procedures of shield tunnels is studied including synchronous construction,asynchronous construction,and sequential construction,on the upward floating of the tunnel using the FLAC3D fluid-solid coupling calculation method.The research shows that under different construction process conditions,the overall uplift deformation of the shield tunnel is shown as small deformation at the starting end,as the shield advances,the amount of tunnel uplift gradually increases,and the structural deformation of the segment is shown as the uplift deformation of the lower segment is larger than the upper part,Affected by the disturbance of the first construction of the tunnel on the stress and seepage field of the surrounding rock of the later constructed tunnel,the uplift deformation of the first construction tunnel is smaller than that of the later construction tunnel,and the greater the distance between successive constructions,the greater the difference between the uplift deformations between the two.
作者
章超
朱泽奇
何应道
ZHANG Chao;ZHU Zeqi;HE Yingdao(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232000,Anhui,China;State Key Laboratory of Rock and Soil Mechanics and Engineering,Wuhan Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,Hubei,China;National and Local Joint Engineering Research Center for Underwater Tunnel Technology,Wuhan 430071,Hubei,China;China Railway Fourth Survey and Design Institute Group Co.,Ltd.,Wuhan 430071,Hubei,China)
出处
《工程建设》
2022年第2期1-6,共6页
Engineering Construction
基金
国家自然科学基金面上项目(52079133)。
关键词
盾构隧道
上浮变形
施工工序
管片
FLAC3D
shield tunnel
floating deformation
construction process
tube piece
FLAC3D
