Mud Flow Constitutive Law of Variable Water Content and Fluid Structure Interaction Analysis of Pier Column under Mud Flow Scouring
Debris flow is one of the main geological disasters in mountainous areas,which causes seriously damages to bridges in mountain areas.During the flow process,the debris flow is significantly affected by the water content,leading to possible variation of its constitutive model.In this paper,the factor of water content is introduced into the Herschel-Bulkley model of mud,and a constitutive model of mud flow material under the simultaneous changes of mass water content and shear rate is proposed.The model is compared with the rheological experiment of Chengdu clay mud to verify its correctness.Then,based on the Navier-Stokes equations of two-phase fluid,the material model is applied to the three-dimensional fluid-structure coupling analysis of the impact of the mud flow on the pier column.The applicability of the model was confirmed by comparing the calculation results with the relevant standards and the empirical formulas of impact pressure in the literature.
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