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结合重庆地铁六号线某段下穿涵洞的工程实例,利用FLAC软件建立模型,对TBM法隧道施工进行了模拟分析。介绍了TBM法施工时应施加的荷载主要有:刀盘破岩时对掌子面的推力,机头部分自重对围岩的压力以及撑靴的支撑力等,以及相应的模拟方法,在模拟开挖过程中荷载依次施加的步骤和形式等。对涵洞的应力和变形进行了计算,结果表明:涵洞结构的应力能满足材料强度要求,但其会产生一定的不均匀沉降,施工时应予以注意。通过分析,说明采用FLAC软件模拟TBM法隧道施工下穿涵洞的稳定性分析是有效的,可为今后类似工程的设计计算提供参考。
Combined with the engineering example of culvert under some section of Chongqing Subway Line 6, the model was built by using FLAC software and the TBM tunnel construction was simulated. Introduced the TBM method of construction should be applied to the load are: the cutter rock breaking face on the thrust, the nose part of the weight of the surrounding rock pressure and support the strength of the boot, and the corresponding simulation methods in the simulation Excavation process in order to load the steps and forms. The stress and deformation of the culvert are calculated. The results show that the stress of the culvert structure can meet the material strength requirements, but it will produce some uneven settlement, which should be paid attention to during construction. The analysis shows that it is effective to use FLAC software to simulate the stability analysis of culverts under TBM tunnel construction, which can provide reference for the design and calculation of similar projects in the future.