爆炸荷载作用下水体防爆墙数值研究

Numerical analysis of blast-resistant effects of waterwalls

水体作为一种具有较大发展潜力的抗爆材料，可用来构筑防爆墙对重要建筑物及人员提供防护。本文采用非线性有限元分析软件Ls—dyna对水体抗爆性能进行了分析研究。运用LBE与MMALE耦合方法提高数值计算效率，离散Lagrangian方法模拟水体在爆炸荷载作用下的解体飞散。经过与理论计算和实验结果的对比，验证了数值计算结果的准确性。通过数值模拟，得到水体抗爆性能的基本规律：随着水体厚度增加，水体的抗爆性能更加显著，但是存在厚度极值；墙体高度对墙体后压力场最大压力峰值影响很大，但是对有效作用范围影响微弱。

As a potential anti-explosion material, water can be used to build anti-blast walls to protect people, infra- structures and buildings from terrorism attacks. In this paper, the non-linear software Ls-dyna is used to analyze the anti-explosion ability of waterwalls. Coupling LBE and MMALE could enhance computing efficiency of the model and dispersing the Lagrangian elements could display the waterwalls fragmentation under explosion. Furthermore, the results are in good agreement with experiments. The following conclusions could be got from the numerical simula- tion results ： the protective capability is better with the increase of the waterwalls thickness. However, there is an ulti- mate thickness corresponding to explosion. The height of waterwalls could affect the residual peak pressure behind evidently, but the influence on the range of pressure is negligible.