软土地层盾尾注浆压力引起的地面隆起分析

发布时间：2018-04-18 21:53

  本文选题：软土地层 + 盾构法　； 参考：《隧道建设》2017年09期

【摘要】：目前已有盾尾注浆压力引起地面隆起的研究均假定盾尾注浆压力均匀分布,这与实际工程中盾尾注浆压力上小下大的形式不符。为更准确预测盾尾注浆压力引起的地面变形,在现有均匀注浆压力引起地面隆起分析的基础上,考虑软土地层盾构隧道施工中盾尾注浆压力上小下大的分布形式,将盾尾注浆对地层的压力效应视为半无限土体中柱形孔的扩张过程,利用镜像法和Mindlin解,推导出软土地层盾尾注浆压力引起的地面隆起计算公式,并通过工程实例,将本文解答、叶飞解答、林存刚经验公式解答、Vesic解答与数值解进行对比分析。结果表明:盾尾注浆压力引起的地面隆起横向曲线总体上呈高斯分布。在预测软土地层地面沉降时,忽视盾尾注浆压力引起的地面隆起是不合理的;用推导出的公式计算上小下大分布形式下盾尾注浆压力引起的地面沉降是可行的,Vesic公式和林存刚经验公式在应用时需要根据具体工程进行相应修正。
[Abstract]:At present, the tail shield grouting pressure caused by the study of ground uplift are assumed to shield tail grouting pressure distribution, and the practical engineering of shield tail grouting pressure on the lower form does not match. For more accurate prediction of deformation of shield tail grouting pressure caused by the ground, causing the existing uniform grouting pressure based on the analysis of the ground uplift. Consider the distribution form of construction of shield tunnel in soft soil shield tail grouting pressure on the lower, the effect of pressure grouting at the tail of formation as a process of expansion of cylindrical cavity in semi infinite space, using image method and Mindlin solution, calculation formula of ground caused by uplift of soft soil shield tail grouting pressure is derived and, through the project example, this solution will answer, Ye Fei, the Lin Cungang formula solution, solution Vesic solution and numerical comparative analysis. The results show that the surface uplift horizontal tail shield grouting pressure caused by the curve to the total The body is Gauss distribution. In the prediction of soft soil ground subsidence, ignoring the shield tail grouting pressure caused by ground uplift is not reasonable; the settlement caused by the shield tail grouting pressure under the ground with the deduced on the lower distribution form is feasible, Vesic formula and Lin Cungang formula needs to be modified according to the specific engineering applications.

【作者单位】： 东南大学交通学院;江苏省城市地下工程与环境安全重点实验室;
【基金】：国家重点基础研究发展计划项目(2015CB057803)
【分类号】：U455.43
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本文编号：1770243