Abstract:During the deployment of artificial reefs,collisions with the riverbed can cause a certain degree of structural damage and sedimentation of the reef.Based on LS-DYNA software,this paper investigates the dynamic characteristics of triangular prism artificial reefs during deployment under static water conditions.It analyzes the terminal stable velocity,collision impact force,stress,and riverbed sedimentation deformation of the artificial reefs under different entry angles（0°,30°,45°,and 60°）and riverbed substrates（clay,gravel soil,and bedrock),and conducts theoretical analysis to validate the numerical simulation results.The research results show that with the increase of entry angle,the stable velocity and collision impact force of the artificial reef terminal show a trend of first decreasing and then increasing.The stable velocity and impact force at 0° are 1.36 times and 2 times those at 45°,respectively.The collision impact force increases with the strength of the riverbed substrate,and the impact force of bedrock substrate is 5-8 times that of clay substrate.The maximum Mises stress of the artificial reefs is negatively correlated with riverbed settlement deformation.The harder the substrate,the smaller the settlement deformation and the greater the stress.The effective available volume reduction rate in bedrock and gravel soil areas is relatively low,while the maximum effective available volume reduction rate of clay substrates can reach 37.41%.The research results can provide theoretical basis for the selection and placement posture of artificial reefs in practical engineering.
