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以重庆轻轨6号线小什字车站区间隧道为例,利用FLAC3D软件建立了由建筑物造成的浅埋偏压隧道计算模型;运用有限差分数值方法对三种不同开挖施工方案进行了数值仿真,得出了浅埋、偏压隧道围岩的地层变形与塑性区的分布受开挖施工先后顺序影响较大。研究结果表明,采用CD法开挖小什字浅埋偏压隧道,首先开挖右导坑是不适宜的;实际施工采用了先开挖左导坑的CD法,其地表沉降、塑性区控制较好,且现场监测数据与仿真模拟结果基本相符。此研究为类似工程采取合理有效的设计方案和安全可靠的施工措施提供了参考依据。
Taking the tunnel of Xiaoshidizhan Station in Chongqing Light Rail Line 6 as an example, the calculation model of shallow buried biased tunnel caused by buildings was set up by using FLAC3D software. Three different excavation schemes were simulated by finite difference numerical method It is concluded that the deformation and plastic zone distribution of the surrounding rock of shallow buried and biased tunnels are greatly affected by the sequence of excavation. The results show that using the CD method to excavate the small-sized shallow buried bias tunnel, it is unsuitable to excavate the right pilot at first. In practice, the CD method of excavating the left pilot pit is adopted. The surface settlement and plastic zone control Better, and the on-site monitoring data and simulation results are basically consistent. This study provides a reference for similar projects to adopt reasonable and effective design schemes and safe and reliable construction measures.