切口拦砂坝的单向流固耦合数值模拟研究

Numerical Simulation on One-way Fluid-structure Interaction of Viscous Debris Flow Impacting on Slit-trap Dam

运用流固耦合理论对黏性泥石流冲击切口拦砂坝坝体进行模拟。实现了从三维模型建立、流场计算到结构分析全过程。将泥石流流体计算结果传递至结构域实现坝体的分析,为解决泥石流防治工程提供理论参考。结果表明:整个泥石流流域内部流速呈现底部小顶部大的趋势,拦砂坝坝体的左右肩的变形和应力均为最大,比较坝体Mises应力云图可知,在泥石流冲击作用下的坝体与沟道接合处以上部分的应力最大。

The fluid-structure interaction theory is used to numerically simulate the viscous debris flow impacting on slit-trap dam, and implement three-dimensional model building, fluid calculation and structure analysis are completed. The calculation results of debris flow will be transmitted to the structure to complete the analysis, which provided the suggestions for debris flow protection engineering. The results shows ： the flow rate of the entire internal debris flow basin is small at the bottom but big at the top big, maximum deformation and strain are around the shoulder of the dam , the Mises stress cloud comparison shows that maximum stress is at the junction of the gully bank connected under the impact force of debris flow.