The shallow buried composite lining is frequently used in underground engineering. A model for predicting dynamic response of composite lining in saturated poroelastic medium under incident P wave is proposed based on nonlocal-Biot theory. The analytical solution is obtained using wave function expansion method. The size effect, which is described by the nonlocal parameter, on dynamic stress concentrate of composite lining is studied in detail. Subsequently, the influences of input frequency, incident angle, thickness of composite lining, stiffness of composite lining and the buried depth of the lining on dynamic stress concentrate are elaborated. The distribution pattern of dynamic stress concentrate factor obtained in this work may provide a beneficial guideline for safety design in tunnel engineering.
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