局部荷载作用下软土盾构隧道纵向沉降数值分析

Numerical Simulations of Longitudinal Settlement of Shield Tunnel Under Local Loading

基于摩尔-库伦准则,建立隧道衬砌与土体相互作用的三维有限元模型,模拟了软土盾构隧道下卧土层性能和隧道上方局部荷载对隧道沉降的影响,揭示了隧道的纵向变形规律.结果表明:隧道纵向沉降最大值与软土夹层弹性模量、纵向长度以及均布荷载集度呈线性关系;隧道沉降值随均布荷载作用长度和宽度增加而增大.

Based on the Mohr-Coulomb Model, the 3-D finite element model on the interactions of lining and soil was established, and used to stimulate the influences of the properties of substratum soil and local uniform load on the ground on the settlement of shield tunnel in soft soil area. The deformation characteristic of tunnels was analyzed in details. The numerical results show that the maximal settlement is linear functions of the elastic modulus of the soft layer, longitudinal length and uniform load, and the settlement of the tunnel increases with the increase of the length and width of the uniform load.