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结合青岛地铁二号线区间隧道下穿上部已完成的三号线区间隧道施工情况,分析了二号线左右隧道以不同方式穿越上部隧道时结构及地表的变形趋势,通过数值模拟研究了结构变形的薄弱位置及沉降槽宽度,选择出了相对稳定的施工方案,并以此提进行了支护方案的改进,并从支护后塑性区变化、围岩应力分布情况和关键位置的位移变化量证实了支护方案的优越性和正确性,为同类工程提供参考意义。
Combined with the completed tunnel construction of the No.3 line in the lower part of the tunnel of Qingdao Metro Line 2, the deformation trend of the structure and the ground surface when the left and right tunnels on the No.2 line traversed the upper tunnel in different ways were analyzed. The deformation of the structure was studied by numerical simulation And the width of settling tank, a relatively stable construction scheme was chosen and the improvement of the supporting scheme was proposed. From the change of plastic zone after support, the stress distribution of surrounding rock and the displacement change of the key position Confirmed the superiority and correctness of the support program, provide reference for similar projects.