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以上海地铁11号线某区间盾构工程为背景,采用相似物理模型试验研究盾构隧道开挖对上方垂直于隧道轴线的地下管线的影响,并将试验结果与数值解对比。采用量纲分析法推导出文中模型试验的相似准则,并基于该相似准则设计出盾构机和隧道模型,分别通过管线刚度试验和模糊数学综合评判方法选定模型管线和配制相似土材料。研究结果表明,自主开发的半自动盾构掘进装置能较好地模拟盾构的开挖过程,较人工开挖扰动更小;下方盾构隧道开挖使管线产生的竖向变形关于隧道轴线呈对称分布,其形态符合高斯曲线的特征,最大竖向变形位于隧道轴线正上方处,竖向变形反弯点出现在与隧道轴线水平距离约一倍隧道直径的位置处;隧道开挖对管线的影响范围随管隧间距的增加而减小,管线竖向变形曲线的反弯点位置随管隧垂直间距的增大而有所内移;管线刚度对管线竖向变形的影响相对较小。
Taking the shield tunnel project in Shanghai Metro Line 11 as an example, the influence of shield tunneling on the underground pipeline perpendicular to the tunnel axis above is studied by similar physical model tests. The experimental results are compared with numerical solutions. Based on the similarity criterion, the shield machine and the tunnel model are designed. The model pipeline and the preparation of similar soil materials are selected respectively by pipeline stiffness test and fuzzy mathematics comprehensive evaluation method. The results show that the self-developed semi-automatic shield tunneling device can simulate the shield excavation process better than the manual excavation disturbance smaller; below the shield tunnel excavation so that the vertical deformation of the pipeline axis symmetry Distribution, the shape of which is in accordance with the characteristics of Gaussian curve. The maximum vertical deformation is located just above the axis of the tunnel. The vertical deformation point of inflexion appears at about one time the horizontal distance from the tunnel axis. The effect of tunnel excavation on the pipeline The range decreases with the increase of the tunnel spacing. The position of the inflexion point of the vertical deformation curve of the pipeline shifts inward with the increase of the vertical spacing of the tunnel. The pipeline stiffness has a relatively small influence on the vertical deformation of the pipeline.