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  The influence of constitutive models on the mechanical behavior of conventional shallow overburden tunnel

  Due to the topographic and route conditions along the Bullet Train lines in Japan, a number of shallow overburden tunnels were excavated in unconsolidated ground using the New Austrian Tunneling Method (NATM). However, ground and tunnel settlements frequently occurred due to the low stiffness of the ground. In the current study, a typical Shinkansen tunnel section with different overburden conditions i.e. 0.5D, 1.0D, 1.5D has been analyzed in soft ground with finite difference analysis, where D is the diameter of the tunnel. For finite difference analysis the soil constitutive models have significant effects on the numerical results. In this study, an attempt is made to evaluate the influence of different soil constitutive models on the behavior of the soil subjected to tunneling. The mechanical behavior of the soil has been modeled by two constitutive models i.e. Mohr-Coulomb model and Modified Cam Clay model. The results are presented in terms of ground displacements and stress paths at the different locations around the tunnel.

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