Optimized Selection of Construction Scheme for Huiqing Expressway Tunnel

In view of the complex construction environment of the mountain tunnel, the construction method conforming to each project is adopted, which is beneficial to avoid blind spots during the construction process. For poor surrounding rock conditions, the thickness of different soils will lead to the joint of the plastic zone of the excavation face, which will cause the overall settlement. Taking Maple Ridge, Daping and Fengshuao Tunnels as an example, comprehensive analysis of different surrounding rock thickness conditions, through the comparison of three construction methods of double side wall method, CD method and three step method, using FLAC finite element software results Analysis gives the most advantageous deformation control method. The results show that the larger the thickness of the overburden, the larger the displacement of the arch and the arch, the double-wall method does not extend to the slip zone in the plastic zone of different soil thickness, and the surrounding rock also maintains the self-stability, compared with the other two methods. Good stability. Therefore, it has a good guiding significance for the construction method in the same situation in the future.

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