双线平行盾构隧道施工引起的三维土体变形研究

发布时间：2018-05-27 00:18

本文选题：双线平行盾构隧道 + 土体变形　；参考：《岩土力学》2014年09期

【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。
[Abstract]:Based on the two-dimensional analytical solution of soil deformation caused by soil loss during the construction of double-line horizontal and parallel shield tunneling, the three-dimensional analytical solution of soil deformation is established. Taking different longitudinal positions as variables, the variation equation of soil loss rate along longitudinal direction is established, and the deformation of soil caused by the construction of two shield tunnels is calculated by considering the influence of tunnel construction on the later tunnel. The total deformation of soil caused by double line parallel shield construction was obtained by superposition. The method can calculate the deep settlement and horizontal displacement of soil and accurately reflect the three dimensional deformation of soil. The results of example analysis show that the predicted value is in good agreement with the measured value, the soil settlement increases with the increase of the distance from the excavated surface, and finally tends to be stable at about x-40 m, and with the approaching of the excavation distance between the first tunnel and the rear tunnel, the settlement of the soil increases with the increase of the distance from the excavated surface to the excavated surface. The maximum total settlement of soil gradually increased, the settlement of soil increased slightly with the depth z, but the width of settlement trough decreased slightly, with the increase of horizontal distance L of the two tunnels axis, the maximum settlement of soil gradually decreased. The shape of settlement curve is gradually changed from V type to W type, which no longer accords with the normal distribution law.
【作者单位】：浙江大学城市学院土木工程系;
【分类号】：U451

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