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该文以某地铁隧道基坑工程为背景,采用flac3D三维有限差分软件建立数值分析模型,对基坑施工的全过程进行了工况动态模拟,分析研究了基坑采用水泥土搅拌桩和水泥土搅拌桩联合抗拔桩两种加固方案时下卧地铁隧道的位移和应力特点,并将二者分析结果进行了对比。水泥土搅拌桩联合抗拔桩方案相对于水泥土搅拌桩方案更好的抑制了隧道回弹量,降低了隧道应力,增强了隧道的安全性。其成果可为优化设计及施工提供有益的参考和借鉴。
In this paper, based on the subway tunnel foundation pit engineering, the numerical analysis model is established by using flac3D three-dimensional finite difference software to simulate the whole process of foundation pit construction. The analysis of the foundation pit using cement soil mixing pile and cement soil Displacement and stress characteristics of underground subway tunnel under two kinds of reinforcement schemes of mixing pile and anti-pull pile are compared, and the results of the two analyzes are compared. Compared with the cement-soil mixing piles, the cement-soil mixing piles combined with the anti-piles solution can restrain the tunnel rebound better, reduce the tunnel stress and enhance the safety of the tunnel. The results can provide useful reference and reference for the optimization design and construction.