Pasternak地基中盾构隧道穿越引起地下管线竖向位移

发布时间：2018-12-18 09:29

【摘要】：采用统一土体移动模型三维解计算盾构施工引起的地下管线平面处土体竖向位移,并基于Pasternak地基模型对地下管线受力模型进行简化,建立单线、双线盾构隧道开挖引起的地下管线三维竖向位移计算公式。将计算结果与实测值进行对比;并探讨了管线材质、管线埋深以及土体损失率改变对管线竖向位移的影响。研究结果表明:计算结果与实测值比较吻合,可以计算单线和双线盾构开挖工况;双线隧道开挖引起的管线竖向位移大于单线隧道引起的管线竖向位移;管线材质和管线埋深的改变对管线最大竖向位移的影响较小,管线最大竖向位移随抗弯刚度增大而减小,随埋深增大而增大;土体损失率的改变对管线最大竖向位移的影响较大,土体损失率越大管线最大竖向位移也越大。
[Abstract]:The three-dimensional solution of uniform soil movement model is used to calculate the vertical displacement of soil in the plane of underground pipeline caused by shield tunneling. Based on the Pasternak foundation model, the stress model of underground pipeline is simplified and a single line is established. The calculation formula of 3D vertical displacement of underground pipeline caused by double line shield tunnel excavation. The results are compared with the measured values, and the effects of pipeline material, buried depth and soil loss rate on the vertical displacement of pipeline are discussed. The results show that the calculated results are in good agreement with the measured values and can be used to calculate the excavation conditions of single-line and double-line shield, and the vertical displacement of pipeline caused by double-line tunnel excavation is greater than that caused by single-line tunnel. The change of pipeline material and buried depth has little effect on the maximum vertical displacement of pipeline. The maximum vertical displacement of pipeline decreases with the increase of bending stiffness and increases with the increase of buried depth. The change of soil loss rate has a great influence on the maximum vertical displacement of pipeline, and the larger the loss rate of soil is, the greater the maximum vertical displacement of pipeline is.
【作者单位】：浙江大学城市学院土木工程系;
【基金】：浙江省科技厅公益技术应用研究项目(2016C33051) 住房和城乡建设部2015年科学技术项目计划(2015-K5-026)资助
【分类号】：U455.43

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