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Two-Stage Method on the Displacement of Underground Pipelines Caused by Excavation of Deep Foundation Pit

DOI：10.13255/j.cnki.jusst.2019.05.011

 作者 单位 E-mail 刘小兵 上海理工大学 环境与建筑学院, 上海 200093 陈有亮 上海理工大学 环境与建筑学院, 上海 200093 chenyouliang2001@163.com 孟伟波 上海理工大学 环境与建筑学院, 上海 200093

针对深基坑开挖引起的周围地下管线位移，基于两阶段法，首先给出了基坑开挖引起的周围自由土体位移的计算方法，然后结合Winkler弹性地基梁模型，建立了受土体卸载附加变形影响的地下管线竖向和水平方向位移方程，通过有限差分法求解出地下管线位移。将此方法应用于工程实例，其理论计算结果与现场实测数据基本吻合，验证了两阶段法的合理性及适用性。本方法可用于分析管线埋深、管线距离、地基土性质等因素对管线变形的影响。

Aiming at the displacement of underground pipelines caused by excavation of deep foundation pit, the algorithm for the displacement of the surrounding free soil caused by excavation was proposed based on the two-stage method. Combined with Winkler elastic foundation beam model, the equations for calculating the vertical and horizontal displacement of underground pipelines subjected to additional deformation of soil unloading are established. The displacement of underground pipeline was solved by finite difference method. Then the two-stage method was applied to an engineering example. The results show that the theoretical calculation is in good agreement with the data measured in field. Thus, the rationality and usability of the two-stage method has been verified. The method presented in this paper can be used for analysis of the influences of pipelines buried depth, distance between pipelines, and soil properties on the deformation of pipelines.
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