文档介绍：第 35 卷第 9 期岩土力学
2014 年 9 月 Rock and Soil Mechanics Sep. 2014
文章编号:1000-7598 (2014) 09-2562-07
双线平行盾构隧道施工引起的三维土体变形研究
魏纲,庞思远
(浙江大学城市学院土木工程系,杭州 310015)
摘要:基于双线水平平行盾构施工中土体损失引起的土体变形二维解析解,建立土体变形三维解析解。取不同的纵向位置
作为变量,建立土体损失率沿纵向的变化方程;考虑先行隧道施工对后行隧道的影响,分别计算两条盾构隧道施工引起的土
体变形,叠加得到双线平行盾构施工引起的土体总变形。其方法能够计算土体深层沉降和水平位移,较精确地反映土体三维
变形。算例分析结果表明:预测值与实测值较为吻合;土体沉降随着离开挖面距离的增加而不断增大,最终在 x = -40 m 左
右时趋于稳定;随着先行隧道与后行隧道开挖距离的接近,最大土体总沉降量逐渐增大;土体沉降会随着深度 z 的增大而略
微增加,但沉降槽宽度将略微减小;随着两条隧道轴线水平距离 L 的增大,最大土体沉降逐渐减小,沉降曲线形状慢慢由 V
型转变成 W 型,不再符合正态分布规律。
关键词:双线平行盾构隧道;土体变形;土体损失;三维解析解
中图分类号:TU 432 文献标识码:A
Study of three-dimensional soil deformation caused by double-line
parallel shield tunnel construction
WEI Gang, PANG Si-yuan
(Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, China)
Abstract: Based on the two-dimension calculation approaches of soil deformation caused by ground loss in double-line parallel
shield tunnel (DLPST) construction, the three-dimensional calculation approaches of soil deformation caused by DLPST are
established. Altering equations of ground loss rate are established by choosing different longitudinal locations as variables. With
consideration of the impact of the first shield construction on the second one’s, the total soil deformation induced by DLPST is
obtained by calculating soil settlement