爆炸荷载下土石坝动力响应特征的数值模拟

土石坝在爆炸荷载下的力学响应是一个非常复杂的力学问题,相关研究甚少。在LS-DYNA软件框架内,以两河口土石坝为研究对象,把坝体材料简化为混凝土、心墙、反滤层与堆石体等4种,用500 kg TNT在坝顶接触爆炸时的瞬态荷载作为荷载源,针对不同材料建立适合于爆炸高加载率特征的本构模型,用数值方法分析了土石坝在潜在爆炸荷载下的破坏与损伤演化规律。结果表明,在爆炸荷载作用下,由于土石坝材料组成的多样性,应力波传播规律异常复杂,土石坝的力学响应呈现出显著的分区特征。

Numerical Simulation of Dynamic Response of an Earth and Rock-fill Dam to a Blast Loading

It is a very complicated problem to research the mechanic response of an earth and rock-fill dam to a blast loading. So far, the relative achievements are not enough to solve the problem. In this paper, a numerical simulation of Lianghekou earth and rock-fill dam to a blast loading has been carried out. The materials of the dam are classified as concrete, core-wall, inverted filtering layer and rock-fill, for which different constitutive relations were used in the simulation to account for the effects of high loading rates. The simulation has been completed in the frame of LS-DYNA. The fracture and damage processes have been simulated using the numerical method. The results show that the phenomenon of stress wave propa-gation is very complicated because of diversity of dam materials, fracture and damage presented in the dam, and its distinctively divisional characteristics.