大截面矩形顶管施工对既有管线影响研究

STUDY ON THE IMPACT OF LARGE CROSS-SECTION RECTANGULAR PIPE JACKING CONSTRUCTION ON EXISTING PIPELINES

  • 摘要: 顶管施工会扰动邻近建筑物,危及工程安全。该文以苏州市城北路综合管廊元和塘段顶管工程为背景,通过ABAQUS有限元分析软件建立三维模型,研究顶管下穿地下管线施工对管周土及既有管线影响,并基于极限分析方法探讨了管线失稳模式。结果表明:大直径矩形顶管顶进方向的影响范围约为2倍顶管宽度,两侧的影响范围约为1倍顶管宽度,地下管线到顶管轴线的水平距离为0.5倍~1倍顶管宽度时,应注意管线受到的水平方向附加荷载是否会导致管线破坏;管线与顶管相对位置对管线破坏影响较为显著,越靠近顶管的管线破坏越严重,滑移线由顶管两侧经由管线向地面发展,破坏部位由管线顶部两侧延伸至底部;除受与顶管相对位置影响外,管线破坏模式还受矩形顶管形状影响,管线顶部及靠近顶管顶角区域破坏风险最大。

     

    Abstract: Pipe jacking construction may cause disturbance to adjacent buildings and structures, endangering the safety of the project. Taking the Yuanhetang section of Chengbei Road Comprehensive Pipe Gallery in Suzhou City as the background, this paper established a three-dimensional model using ABAQUS finite element analysis software to study the impact of pipe jacking construction on surrounding soil and existing pipelines. Based on the ultimate analysis method, the pipeline instability mode is also discussed. The results demonstrate that the influence range of the large-diameter rectangular jacking pipe in the direction of jacking is about twice the width of the pipe, and the influence range on both sides is about one width of the pipe. When the horizontal distance from the underground pipeline to the axis of the jacking pipe is 0.5 to 1 times the width of the jacking pipe, attention should be paid to whether the additional horizontal load on the pipeline will cause damage. The relative position of pipelines to the jacking pipe has a significant impact on pipeline damage. The closer the pipelines are to the jacking pipe, the more severe the damage is. The slip line extends from both sides of the jacking pipe through the pipelines to the ground, and the damaged area extends from the top sides of the pipelines to the bottom. In addition to the influence of the relative position with the jacking pipe, the pipeline damage pattern is also affected by the rectangular shape of the jacking pipe, with the highest risk of damage occurring at the top of the pipelines and in the corner areas near the jacking pipe.

     

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