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针对城市新建地下通道下穿既有公路的工程情况,采用三维数值模拟手段对既有公路路面纵横向影响范围和应力分布特征及洞周的位移、应力随隧道开挖的动态变化规律进行了研究,得到了既有公路在隧道下穿过程中的最危险区域,路面底部很有可能会产生受拉破坏,同时隧道内侧拱顶将产生沉降,拱底将产生隆起等结论性成果,进而提出了保证既有公路正常运营和新建隧道安全施工的方法、监测手段和加固措施。
Aiming at the project of underpass existing underpass in urban newly built underground passage, the vertical and horizontal influence range and stress distribution of existing highway pavement and the displacement and stress of the surrounding tunnel are studied with the dynamic change of tunnel excavation by means of three-dimensional numerical simulation , Got the existing road under the tunnel through the most dangerous areas in the process, the road is likely to have undermining the bottom of the collapse, while the tunnel dome will have subsidence, the end of the crown will have a conclusive result raised, and then put forward To ensure the normal operation of both the existing highway and the new tunnel construction safety methods, monitoring methods and reinforcement measures.