盾构施工对地下管线的影响分析

发布时间：2018-03-06 03:14

本文选题：盾构　切入点：地铁　出处：《安徽建筑大学》2015年硕士论文　论文类型：学位论文

【摘要】：盾构法以其独有的高效、智能、安全等特点和优势成为目前城市地铁建设中普遍采用的方法,但是采用这种方法会引起土层不同程度的沉降,当沉降比较大时,就可能会使土层中已埋的管线发生变形,严重时可能会断裂,破坏城市的管线系统,造成不必要的经济损失和城市危害。针对合肥地铁一号线沿线的一段盾构法施工的路段,本文研究了采用盾构法施工对地表沉降产生的影响,运用MIDAS/GTS三维有限元软件创建盾构法隧道施工的三维模型,数值模拟了盾构对已埋管线的影响,总结出地表沉降以及管线的变化规律,分析了不同开挖段地表的沉降变化。地表沉降槽曲线近似服从高斯正态分布,沉降的最大值处于隧道轴线的正上方,由隧道轴线向两边成对称分布状态。由隧道轴线向两端,地表的沉降值逐渐减小,随着盾构的不断推进,地表的沉降增加的速度越来越快。同时将数值模拟的结果与Peck经验公式法计算所得数据进行拟合,验证了数值模拟方法在本工程中的可靠性。通过对盾构推进过程中,改变管道与隧道的相对距离、管线的材质、管线的直径等参数,分析这些参数改变下管线变化规律以及管线最大沉降的变化。随着管线与隧道相对距离的增加,管线的变形逐渐减小;管线的直径逐渐增加,其变形逐渐减小;当管线的弹性模量减小时,管线的变形逐渐增大。在本文的最后,给出了一些管线的控制标准,同时采用不同的方法,计算管线的允许曲率半径,对管道接缝的张开值进行验算,提出几点盾构推进时管线的保护方法。
[Abstract]:The shield method is widely used in urban subway construction because of its unique characteristics and advantages, such as high efficiency, intelligence, safety, etc. However, using this method will cause the settlement of soil layers to different degrees, when the settlement is relatively large, It may cause deformation of buried pipelines in the soil layer, break up seriously, destroy the city's pipeline system, cause unnecessary economic losses and urban hazards. In view of a section of shield tunneling construction along Hefei Metro Line 1, In this paper, the influence of shield tunneling on ground subsidence is studied. The 3D model of shield tunnel construction is created by using MIDAS/GTS software, and the effect of shield tunneling on buried pipeline is numerically simulated. The variation law of surface subsidence and pipeline is summarized, and the surface subsidence changes in different excavation sections are analyzed. The surface subsidence trough curve is approximately distributed from Gao Si normal distribution, and the maximum settlement is located directly above the tunnel axis. From the axis of the tunnel to the two ends of the tunnel, the settlement value of the surface gradually decreases, as the shield machine continues to advance, At the same time, the numerical simulation results are fitted with the data obtained by Peck empirical formula method, which verifies the reliability of the numerical simulation method in this project. Changing the relative distance between pipeline and tunnel, the material of pipeline, the diameter of pipeline, and so on, and analyzing the variation law of pipeline and the maximum settlement of pipeline under the change of these parameters. With the increase of relative distance between pipeline and tunnel, the relative distance between pipeline and tunnel is increased. The deformation of the pipeline decreases gradually, the diameter of the pipeline increases, the deformation of the pipeline decreases gradually, and the deformation of the pipeline increases gradually when the elastic modulus of the pipeline decreases. At the end of this paper, some control standards of the pipeline are given. At the same time, different methods are used to calculate the allowable curvature radius of pipeline, to check the opening value of pipeline joint, and to put forward several protection methods for pipeline during shield tunneling.
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.43;TU990.3

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