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基坑墙后地表沉降S与围护结构的变形D密切相关,但其定量关系尚不明确。研究确定S-D的定量关系后,可以通过围护结构的侧移来预测墙后地表的沉降。本文采用数值模拟及参数分析的方法,建立了59个三维有限元数值模型,研究了不同地铁基坑几何参数,并在实际工程应用中采用VWD-A型振弦式土体沉降计进行了地表沉降测量,并与模拟分析数据进行了对比,结果表明基于所建立的S-D定量关系预测的墙后地表沉降和实测值吻合度较高。
The settlement S of the ground surface behind the foundation pit wall is closely related to the deformation D of the envelope structure, but the quantitative relationship is not yet clear. After studying the quantitative relationship of S-D, the settlement of the wall behind the wall can be predicted by lateral displacement of the envelope. In this paper, 59 three-dimensional finite element numerical model was established by numerical simulation and parameter analysis method. Geometrical parameters of different subway foundation pit were studied. In the practical engineering application, VWD-A vibrating wire soil subsidence meter was used for surface Settlement measurements are compared with those from the simulation analysis. The results show that the ground settlement measured after the wall based on the established SD is in good agreement with the measured data.