新型阻尼耗能式泥石流格栅坝的工作机制及理论计算方法OA北大核心CSTPCD

In order to solve the problem that the traditional grille dam is easy to be damaged by the impact of debris flow,a novel Damping Energy Dissipation Debris Flow Grille Dam(DEDDFGD)is proposed,and its structural composition and working principle are interpreted.Based on the force method,deformation compatibility equation and Winkler elastic foundation beam theory,the mechanical calculation model of each component in the energy dis-sipation and reset stage of the novel structure is established,and the calculation method of the buried depth of the column is given.The mechanical properties of the novel structure were analyzed by finite element software,and the theoretical and simulated values were compared.The results show that:(1)The novel DEDDFGD is proposed on the basis of flexible energy dissipation concept,which consumes the impact energy of debris flow through the up-stream grille and the damping energy dissipation brace.Compared with the traditional debris flow grille dam,the impact resistance power is greatly improved.(2)The force of novel DEDDFGD is divided into two stages:energy dissipation and reset.The deformation coordination in the energy dissipation stage makes the internal force of the beam between the side column and the middle column change sharply at the end of the sliding bearing,which should be considered in the design.In the reset stage,the internal force of the top vertical bar and the cross beam is greater than that of other layers,which should be checked emphatically.(3)The theoretical calculation is basi-cally consistent with the internal force change trend of each component of the simulation,which verifies the reliabil-ity of the calculation method in this paper.The results can provide a theoretical basis for the application of the novel DEDDFGD.