A Two-dimensional Frictional Contact Model of the Dynamic Interaction between Saturated Soil and Structure
Due to the existence of pore fluids, the dynamic interaction between saturated soil and structure is more complex than that of classical solid-solid contact.There are two main types of coupling problems:Fluid-solid coupling in saturated soils, and contact coupling between structures and saturated soils.In order to solve the problem of dynamic contact friction effect between saturated soil and structure, a dynamic frictional contact model of saturated soil and structure is established to reflect the state of"bonding-slipping-separation".The model is a contact interface consisting of a series of"point-line"elements, and is based on the Mohr-Coulomb model and the effective stress principle.According to the contact conditions, the contact governing equations under different contact states are established from displacement and pore pressure aspects.The model is verified by the interaction between the retaining wall and the saturated soil.Finally, taking the Dakai station as the engineering background, the dynamic responses between the saturated soil and the underground structure considering the contact model are analyzed, and the necessity of considering the contact model is analyzed.
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