双线平行盾构隧道施工引起的三维土体变形研究

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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。 Based on the two-dimensional analytic solution of soil deformation caused by soil loss in the construction of double horizontal parallel shield, a three-dimensional analytic solution of soil deformation is established. Take different vertical position as a variable to establish vertical variation equation of soil loss rate. Considering the influence of advanced tunneling on the back tunnel, the soil deformation caused by the construction of two shield tunnels is calculated respectively, and the double parallel shield Structure caused by the total soil deformation. The method can calculate deep subsidence and horizontal displacement of soil so as to accurately reflect the three-dimensional deformation of soil. The results of the example analysis show that the predicted values ​​are in good agreement with the measured values. The settlement of soil mass increases with the increase of the distance from the digging surface and finally stabilizes when x = -40 m. Tunnel excavation distance approaching, the maximum total soil settlement gradually increased; soil settlement will increase with the depth of z slightly increased, but the settling tank width will be slightly reduced; with the horizontal distance between the two tunnel axis L The settlement of the largest soil gradually decreases, and the shape of the settlement curve gradually changes from V-type to W-type and no longer meets the normal distribution law.
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