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以大连市地铁2号线202标段工程为研究对象,通过相似材料模型试验绘制不同地层随时间沉降曲线,即同一时刻不同地层沉降槽曲线和不同地层水平位移曲线,得到盾构隧道施工地层移动规律。试验结果表明,不同地层各测点的垂直位移随时间的变化可用以时间为自变量的负指数函数表示;先行隧道施工对地层产生扰动,引起地层软化,导致两条隧道之间地表沉降明显叠加,沉降较大;隧道开挖时,若存在地下结构或管线,其将受到附加剪切作用,易出现裂缝,在施工中必须做好切实可行的防护措施。
Based on the project 202 of Metro Line 2 in Dalian City, the subsidence curves of different strata over time are plotted by similar material model tests, that is, the curves of settlement troughs and the horizontal displacements of different strata at the same time, law. The experimental results show that the vertical displacements at different points in different strata can be expressed as negative exponential function with time as an independent variable. The first tunnel construction causes disturbance to the formation and causes the formation to soften, resulting in apparent superposition of surface subsidence between the two tunnels , Large settlement; tunnel excavation, if there is an underground structure or pipeline, it will be subjected to additional shear effect, prone to cracks in the construction must be feasible and protective measures.