The scaled boundary method (SBM) is an effective numerical approach for analysing elastostatics of bounded and unbounded media. To enhance abilities of the scaled boundary approach, this method can be coupled with mesh free technology. In this paper a point interpolation based SBM is proposed to analyse seismic soil-tunnel interaction problem. In the proposed approach, boundary of domain is modelled with the scaled boundary point interpolation method while interior domain is modelled by the conventional finite element method (FEM). This is the first time that a mesh-free scaled boundary method is used to analyse seismic problems. The presented method has some advantages over previously presented meshfree SBMs. In the scaled boundary point interpolation method, the shape functions have the Kronecker delta function property and do not require radial basis functions to discretize the boundary of 2D problems. A shaking table test is designed and used to verify the proposed method. It is shown that the proposed numerical approach leads to results that are in a good agreement with those of the designed shaking table tests.
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