Model for the particle flow impact on rigid structures with different composition of rock content and slope

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (14) : 268-298.

CHENG Hao1, HAN Peifeng1, 2, SU Youwen1

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Abstract

The damage of box girder bridge structures under the impact of soil-rock mixture landslide or collapse is rather common, and the stone content and slope are important factors affecting the impact and damage of box girder structures.A discrete element method (DEM) was used to simulate the dynamic responses of rigid structures under different composition of stone content and slope.The results show that the larger the stone content and the larger the slope, the shorter the kinetic energy dissipation time of the particle flow and the greater the impact force; the effect of the stone content on the impact force is less than that of the slope; the coupling action of soil and rock particles has a greater influence on the normal force than the single action of soil or rock particles.Based on the simulation results, a mechanical model for the impact of the soil-rock mixture on rigid structures was constructed, and the equation for the impact force and impact force action distance was derived.In order to verify the reliability of the constructed mechanical model, the calculation results of the impact force by the model were compared with those by the Jiang model, the Adel model and the simulation.It is found that the impact forces calculated according to the model are basically consistent with the simulation results.The research results provide a reference to the prevention and treatment of this type of disasters.

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stone content / slope / soil-rock mixture / impact force / impact model

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CHENG Hao, HAN Peifeng, SU Youwen. Model for the particle flow impact on rigid structures with different composition of rock content and slope[J]. Journal of Vibration and Shock, 2021, 40(14): 268-298

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