浅埋大断面顶管施工引起地基变形规律分析

发布时间：2018-10-24 09:41

【摘要】：随着城市地下空间的不断开发利用,顶管法也在我国城市隧道施工中得到广泛应用。本文通过对深圳地铁7号线华强北站浅覆土大断面顶管施工过程中地表变形实际结果的整理分析,结合有限元分析方法,对浅埋条件下大断面顶管顶进施工过程中地表变形的规律进行研究,分析注浆压力等施工参数对地表变形的影响。通过不同影响因素的分析,发现顶管施工中土体损失是引起地表沉降的主要因素,因此实际施工中需要严格控制出土量。结果表明顶管顶进过程中由于土体损失作用,在顶管机掘进面上方地表会出现显著沉降变形,随着顶管进一步推进以及注浆压力的施加,地表沉降会逐渐恢复并出现一定的隆起,随着注浆压力的消散,地表又表现为一定的沉降变形。地表沉降主要集中在顶管施工区域,显著影响范围为2.5倍顶管宽度。
[Abstract]:With the continuous development and utilization of urban underground space, pipe-jacking method has been widely used in the construction of urban tunnels in China. In this paper, through the analysis of the actual results of surface deformation during the construction of shallow overlying soil pipe jacking in Hua-Qiang North Railway Station of Shenzhen Metro Line 7, combined with finite element analysis method, This paper studies the law of surface deformation in the process of large section pipe jacking construction under shallow burial condition, and analyzes the influence of grouting pressure and other construction parameters on surface deformation. Through the analysis of different influencing factors, it is found that the soil loss is the main factor that causes the ground subsidence in pipe jacking construction, so it is necessary to strictly control the unearthed amount in the actual construction. The results show that due to the loss of soil in the jacking process, there will be significant settlement and deformation on the surface above the driving surface of the pipe-jacking machine, and with the further advance of the pipe-jacking and the application of grouting pressure, The surface subsidence will gradually recover and appear a certain uplift, and with the dispersing of grouting pressure, the surface will show a certain settlement deformation. The surface settlement is mainly concentrated in the pipe-jacking construction area, and the significant influence range is 2.5 times the width of pipe-jacking.
【作者单位】：中电建南方建设投资有限公司;浙江大学建筑工程学院;
【分类号】：TU990.3

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