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针对盾构隧道开挖引起的地表沉降问题,基于GAP法模型的基本原理,通过对该模型的改进,借助FLAC2D进行数值分析,对盾构隧道的地表沉降规律进行了研究.得出了同一盾构直径随着隧道埋深增加的情况下,地表最大沉降值逐渐减小、地表沉降槽逐渐变宽的规律,且隧道埋深和地表最大沉降值存在某种线性关系.该成果对盾构隧道开挖引起的地表沉降分析具有一定的参考价值和指导意义.
Aiming at the problem of ground settlement induced by shield tunneling and based on the basic principle of GAP method, the ground settlement rule of shield tunnel is studied by the improvement of the model and numerical analysis by FLAC2D. The same shield With the increase of buried depth of tunnel, the maximum settlement of ground surface gradually decreases and the ground settlement trench gradually widens, and there is a certain linear relationship between tunnel depth and the maximum settlement of the earth’s surface. Analysis of surface subsidence caused by excavation has a certain reference value and guiding significance.