既有隧道在上覆桩复合地基下的形变响应分析

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中图分类号：U416 文献标志码：A DOI： 10.15935/j.cnki.jggcs.202503.0018

AbstractThe soft soil subgrade loadingand micro-pilecomposite foundation willbreak the original soil stress field and have an adverse impact on the existing tunnel.The existing deformation theory of tunnels caused by subgrade loading ignores the influence of the solidified soil layer.Based on this，a simplified calculation method was proposed.The existing tunnel was simplified into a Euler-Bernouli beam resting on the Winkler foundation，a balanced differential equation was established，stress and displacement boundary conditions were introduced，and the expression of the deflection function is obtained.Comparing with the actual measurement results，the applicability of proposed method was verified.The results show that the maximum horizontal displacement of the tunnel has an approximately linear positive correlation with the stacking height. The pile replacement rate has a significant impact on the horizontal displacement.The pile-soil stress ratio has a significant impact on the tunnel deformation.

Keywordstunnel engineering，solidified soil，Euler-Bernoulli beam，displacement coupling

0 引言

在既有隧道上方开展道路等基础设施建设，需要进行堆载、地基处理等作业。（剩余10033字）