冲击荷载下泥石流拦挡坝动力响应分析

Dynamic response analysis of the new debris flow block under impact load

泥石流具有强烈的冲击破坏作用,是防治结构毁损的重要影响因素,本文基于计算流体动力学理论,采用流体分析软件CFX对黏性泥石流进行模拟,得到了泥石流速度场和压力场的分布特征。采用流固耦合分析方法,运用有限元程序ANSYS对一新型泥石流拦挡结构在泥石流冲击力作用下的动力响应进行数值模拟,得到结构的位移时程曲线和应力时程曲线。通过对比分析新型拦挡坝与普通实体坝的响应,得到一些有益的结论。研究表明:冲击力随流速增大而增大,大块石的冲击作用是使结构破坏的重要因素,该结果为泥石流拦挡工程的设计提供了参考。

Debris flow has strong impact damage effect. It is the important influence factors for the block structure damage. Based on the computational fluid dynamics theory,fluid analysis software CFX was used to simulate the viscous debris flow. It can be deduced the debris flow velocity field and pressure field distribution characteristics. Following the fluid-structure coupling analysis method,Numerical simulation a new type of debris flow block structure which has been impacted by debris flow by the finite element program ANSYS. It can be deduced the structure's displacement time history curve and stress time history curve. Through comparative analysis the response of the new block dam and common block dam response,it can be get some useful conclusions. Research shows that: Impact force increasing with the velocity add. The shock effect of the stone is the important factor of structural failure. The result can offer some suggestions for debris flow block engineering design.