深基坑开挖对邻近大直径管线影响的优化分析

为了研究由狭长型的市政管廊基坑开挖引起邻近管线沿长度方向的位移变化.以杭州管廊基坑工程为背景,运用有限元软件PLAXIS建立三维数值模型,探讨不同围护结构形式下的基坑开挖对邻近大直径污水管线的影响规律.分析得出管线的位移因近邻基坑的开挖存在时空效应,且提高基坑围护结构的刚度可以减小20％管线位移量;同一围护结构形式下两条管线的竖向位移变化趋势基本一致,但两条管线之间在水平方向的位移存在较大的差距,应分别监测两条管线的水平位移,研究结论和建议可为相似工程提供一定的理论依据.

Optimization Analysis of the Influence of Deep Foundation Pit Excavation on Adjacent Large-diameter Pipeline

The excavation of long-narrow municipal administration foundation pit will cause the displacement and internal force of the adjacent pipeline along the length direction.Based on some foundation pit engineering of Hangzhou Pipe Corridor, finite element software (PLAXIS 3D) was used to build three-dimensional model. Influence of the adjacent Large Diameter sewage pipeline will be discussed under different enclosure structure. Pipeline has the space-time effect of displacement due to the excavation of the adjacent foundation pit. And increasing the stiffness of enclosure structure can reduce the displacement of pipeline by at least 20%. The vertical displacement of the two pipelines under the same enclosure structure is basically the same. However, there is a big gap between the two pipelines in the horizontal displacement. The horizontal displacement of the two pipelines should be monitored respectively. The conclusions and suggestions obtained from this paper can be used as references for the similar engineering.