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研究目的:通过三维数值模拟,研究隧道施工过程对双叠隧道的影响。创新要点:使用全三维数值模拟方法研究软土中双叠隧道施工对先挖隧道或地面的影响。研究方法:1.运用FLAC软件创建双叠隧道的三维数值模型(图1);2.分情况模拟机械化双叠隧道的挖掘过程;3.研究不同情况下的地面沉降,水平地面位移,以及隧道衬砌的法向位移、法向力、纵向力和弯曲力矩等。重要结论:1.新隧道施工对现有的隧道有很大的影响,最大影响出现在先挖上层隧道的情况下;2.一般来说,上层隧道的挖掘会比下层隧道产生更大的地面沉降;3.下层隧道产生的法向力总是比上层隧道大;4.在多数情况下,下层隧道产生的法向位移和弯曲力矩要比上层隧道小。
Research purposes: Through three-dimensional numerical simulation, the impact of tunnel construction process on double-stack tunnel. Innovative points: The full three-dimensional numerical simulation method to study the impact of double-stack tunnel construction in soft soil excavation of the tunnel or the ground. Research methods: 1. Using FLAC software to create a three-dimensional numerical model of double-deck tunnel (Figure 1); 2. Simulation of sub-conditions of mechanized double-stack tunnel excavation process; 3. Under different conditions of land subsidence, horizontal ground displacement, Lining the normal displacement, normal force, longitudinal force and bending moment. Important conclusions: 1. The new tunnel construction has a great impact on the existing tunnel, the greatest impact occurred in the case of digging the upper tunnel; 2. In general, the excavation of the upper tunnel will produce more ground than the lower tunnel Subsidence; (3) the normal force generated by the lower tunnel is always larger than the upper tunnel; (4) in most cases, the lower tunnel produces smaller normal and bending moments than the upper tunnel.