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城市地下通道浅埋暗挖法施工会导致地层变形和地表沉降。采用通用有限元软件ABAQUS,对地下通道浅埋暗挖施工过程进行数值模拟,根据围岩开挖引起的位移响应和应力响应计算,结合现场实测数据,评价地下通道浅埋暗挖法施工对城市道路路面结构的影响,并讨论长管棚超前预支护对减小围岩开挖引起的路面结构附加弯拉应力的意义。分析结果表明:浅埋地下通道,围岩软弱,暗挖施工会引起显著的地层损失和路表沉降,这会导致沥青混凝土路面结构内形成较大的附加弯拉应力;采用长管棚超前预支护可控制地层损失和路表沉降,并可减小由此引起的路面结构附加弯拉应力。
The construction of shallow underground tunneling in underground passage of city will lead to the formation deformation and surface subsidence. The common finite element software ABAQUS is used to simulate the construction process of underground tunnel under the conditions of shallow excavation and excavation. According to the displacement response and stress response calculation caused by excavation of surrounding rock and the field measurement data, Road pavement structure and discusses the significance of advanced pre-support of long pipe shed to reduce the additional bending stress of pavement structure caused by excavation of surrounding rock. The results show that shallow underground tunnel and weak surrounding rock can cause significant formation loss and road surface settlement due to undercut construction, which leads to large additional bending and bending stress in the asphalt pavement structure. Protection can control formation loss and road surface settlement, and can reduce the additional bending stress of pavement structure.