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采用一般的盾构法进行隧道施工,不可避免会导致盾构正面的地层损失,以及推进中和推进后的径向地层损失。沿着隧道轴线,向内松弛了的地层移动向轴线上方及四周扩散,并随着地层扰动范围的扩大而减小。最后在地表出现一个倒置钟状的凹陷,地表沉降槽随着隧道施工的进展而向前移动。如果在沉降范围内正好有建筑物、道路和公共埋设物,就有必要估算这些建筑物、道路和公共埋设物的沉降量以及这些建筑物产生破坏的危险性。硬粘土中,一条施工良好的隧道其地表沉降不到10mm,而软弱、易变、压缩性土层中,地表沉降可能会出现大于100mm的情况。土体移动对埋设管和结构的影响,可以使用土与结构的线弹性分析形式进行评估。本文分别考虑短期小的土体沉降和长期大的地层移动,对管线和建筑物基础板的作用结果。
The tunnel construction using the general shield method inevitably leads to the formation loss of the front shield and the radial formation loss after propulsion and neutralization. Along the tunnel axis, inward slack formation movement spreads above and around the axis and decreases with the extension of the disturbance zone. Finally, an inverted bell-shaped depression appeared on the surface, and the surface subsidence groove moved forward as the tunnel construction progressed. If there are buildings, roads and public embankments within the settlement, it is necessary to estimate the settlement of these buildings, roads and public embankments and the danger of their destruction. Hard clay, a well-constructed tunnel surface settlement of less than 10mm, and weak, variable, compressive soil, the surface subsidence may occur more than 100mm. The effect of soil movement on the buried pipe and structure can be assessed using the linear elastic analysis of soil and structure. In this paper, we consider the short-term small soil subsidence and long-term large-scale formation movement, the pipeline and building foundation plate results.