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城市地铁隧道开挖施工后与地表建筑物相互影响,隧道上方与建筑物地基支承范围内覆岩区域的稳定性将决定两者整体的安全。结合青岛地铁区间隧道下穿某高层建筑工程实际,采用有限元极限分析法对不同覆岩厚度与隧道近接建筑施工破坏机制的关系进行了探讨。结果表明:隧道拱顶至建筑基底间覆岩厚度较小时,潜在破裂范围由洞室周边延伸至基底地表,覆岩厚度达一定程度时围岩潜在破裂范围仅位于洞室周边附近,对上部建筑影响不大;有限元极限分析法是分析隧道近接建筑破坏机制及演化过程的有效方法;工程实施效果验证了所得结论的合理性。
The interaction between urban subway tunnels and the surface buildings after excavation construction and the stability of the overlying strata areas above the tunnels and within the supporting area of the building foundation will determine the overall safety of the two. Combined with the actual project of crossing a certain high-rise building in Qingdao metro tunnel, the relationship between different overburden thickness and failure mechanism of tunnel abutment building was discussed by finite element method. The results show that the potential rupture range extends from the periphery of the cavern to the surface of the basement when the thickness of the overburden rock from the tunnel vault to the basement of the building is small. When the thickness of the overburden rock reaches a certain extent, the potential rupture range of the surrounding rock is only located near the periphery of the cavern, The finite element method is an effective method to analyze the failure mechanism and evolution process of the tunnel near the building. The project implementation results verify the rationality of the conclusion.