地铁盾构隧道施工对地层变形影响的三维数值模拟

摘要

以南京地铁玄武门—新模范马路区间隧道盾构施工工程为背景,使用FLAC3D软件在考虑盾构隧道施工中的开挖、排土、衬砌等步序的前提下,进行盾构隧道掘进施工对地层变形影响的三维数值模拟.结果表明,在盾构掘进施工过程中,地层沉降具有明显的时间效应;地表沉降量随之逐渐增大;地层横向沉降变形随着地层埋深的增加,最大沉降值逐渐增大,沉降槽宽度逐渐减小;地层沉降历时曲线呈现出反"S"形.%Taking the construction of shield tunnel of Nanjing Metro Subway Xuanwumen Station-New malumo-fan Station as the background,considering the process of tunnel construction:shield driving,grouting and lin-ing assembling and other processes,stratum deformation affects innduced by the construction of shield tunnels were simulated with FLAC3D.The results show that the stratigraphic settlement has obvious time effect during the construction of shield tunneling.At the same time,surface subsidence is gradually increased.The trans-verse settlement of the formation is increased with the increase of the depth of the formation,and the maximum settlement value is increased gradually,and the width of the settling tank is decreased.The settlement curve shows an inverted "S" shape.