泥石流大块石冲击下钢拱拦挡坝的抗冲击性能

摘要

为使透水型拦挡坝更有效地拦蓄泥石流中的大块石,结合拱结构的受力特点,设计出一种钢拱结构.利用非线性有限元分析软件ANSYS/LS-DYNA进行数值模拟,用钢球模拟泥石流大块石,分别对钢 拱结构的两种坝体类型的3个典型部位进行大块石冲击下的动力响应模拟,从结构的应力、冲击力、位移3个方面进行对比分析.结果表明:与钢拱网格坝相比,钢拱混凝土网格坝的应力大小随着时间的增加, 在同一荷载条件作用下应力减少的幅度为15.7%,冲击力峰值明显大于钢拱网格坝;位移较钢拱网格坝显著降低,说明钢拱混凝土网格坝具有良好的抗冲击性能.%In order to make the water-permeable blocking dam block and retain the rock blocks in the debris flow more effectively, the feature of force acting on the arch structure was employed to design a kind of steel-arch structure, and the nonlinear finite element analysis software ANSYS/LS-DYNA was used to carry out its numerical simulation, in which the steel balls were adopted to simulate the rock blocks, the dynamic response simulation of three typical parts of two types of steel-arch structure was conducted respectively under the impact of the rock blocks, and the comparative analysis of the stress in the structure, impact force on it and displacement was performed.The result shows that compared with steel-arch meshed dam, the stress in steel-arch concrete mashed dam caused by identical load will decrease with time, the stress decrease range being 15.7%, the peak value of the impact force will be remarkably layer, and the displacement will be obviously less, manifesting that the steel-arch concrete meshed dam has good impact resistance.