液化区盾构隧道位置对上浮效应影响研究

Research on the influence of the relative position of shield tunnels in liquefaction zone on its floating effect

为研究可液化地层中盾构隧道上浮的影响因素,依托某地铁工程,用ANSYS建立了“荷载-结构”模式与“地层-结构”模式相结合的有限元模型,研究了液化区长度和隧道埋深对盾构隧道上浮力学特性的影响规律。结果表明:液化上浮计算中,衬砌危险位置发生在土体液化区与非液化区的交界面;液化区长度越长,衬砌的上浮位移和轴向应力越大;隧道埋深越小,衬砌的上浮位移和轴向应力越大。

In order to study the influencing factors of shield tunnel floating in liquefiable strata,this paper relies on a subway project and uses ANSYS to establish a finite element model combining the“load-structure”model and the“stratum-structure”model to study the length and length of the liquefaction zone.The influence of the buried depth of the tunnel on the floating mechanical properties of the shield tunnel.The results show that:in the calculation of liquefaction and floating,the dangerous position of the lining occurs at the interface between the soil liquefaction zone and the non-liquefaction zone;the longer the liquefaction zone,the greater the floating displacement and axial stress of the lining;the smaller the buried depth of the tunnel,the greater the floating displacement and axial stress of the lining.