| 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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| 引用本文： | 魏 纲,庞思远.双线平行盾构隧道施工引起的三维土体变形研究[J].岩土力学,2014,35(9):2562-2568. |
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| 作者姓名： | 魏 纲 庞思远 |
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| 作者单位： | 浙江大学城市学院 土木工程系，杭州 310015 |
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| 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。
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| 关 键 词： | 双线平行盾构隧道 土体变形 土体损失 三维解析解 |
| 收稿时间： | 2014-03-03 |
Study of three-dimensional soil deformation caused by double-line parallel shield tunnel construction |
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| WEI Gang,PANG Si-yuan.Study of three-dimensional soil deformation caused by double-line parallel shield tunnel construction[J].Rock and Soil Mechanics,2014,35(9):2562-2568. |
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| Authors: | WEI Gang PANG Si-yuan |
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| Institution: | Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, China |
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| 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 caused by both the first and the second shield tunnel construction. The proposed method is able to calculate the deep soil settlement and horizontal soil displacement, which can reflex the three-dimension soil deformation relatively precisely. The result indicates that the calculated value by the proposed method almost coincides with measured value. As the distance to excavation face x increases, the soil settlement volume tends to increase, and remains stable when x=-40 m approximately in the end. The maximum of total settlement volume increases as the excavation distance between the first and the second shield shortens. With the depth of z increasing, the soil settlement increases slightly, but the settlement slot width slightly reduces. The maximum settlement tends to decrease along with two article tunnel axis level distance L increasing, and the settlement curve shape will slowly change from V-shape into W-shape which is not conform to the normal distribution. |
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| Keywords: | double-line parallel shield tunnel soil deformation ground loss three-dimensional calculation approaches |
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