Abstract Protective barriers are regarded as a useful means to enhance the safety level of buildings and residents in cases of air blast and impact scenarios. However, only limited research exists concerning the properties and effectiveness in mitigating the blast loads of air-permeable metallic barriers, which requires far fewer materials than ordinary solid walls. This paper explores the blast mitigation effect of an innovative barrier type using woven wire mesh. Numerical models were developed and validated against the experimental values of both peak overpressures and maximum impulses, which were published by the authors in a previous study. The influence of the Mach stem formation, which is attributed to the small elevation of the explosive charge above the ground surface, on the blast loads is also examined. It is found that the Mach stem formation significantly affects the peak overpressure at gauge ps1 (1 m ahead of the barriers), whereas its effects on the peak overpressures at the remaining gauges and on the maximum impulses at all gauges are negligibly small. This indicates that the validated numerical models can be used to assess the blast mitigation effect behind the barriers. Based on the numerical results at the employed gauges, the barriers using woven wire mesh can achieve an overpressure (impulse) reduction as high as 31.6% (41.6%) with respect to the free field scenario, in which no obstacles exist in the path of the shock wave propagation. Furthermore, the validated numerical models are used to shed light on the barrier behaviour against air blast by analysing the overpressure-time histories and by visualizing the shock wave propagation. This assists in pointing out the underlying reasons for the noticeable phenomena observed in the experiments. Moreover, two parametric studies are conducted in order to discuss the impact of the gabion wall thickness and the opening span between the gabion walls on the blast mitigation effect of barriers.

中文翻译：

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编织丝网创新屏障减爆效果数值研究

摘要 防护屏障被认为是在空气爆炸和撞击情况下提高建筑物和居民安全水平的有效手段。然而，关于减轻透气金属屏障的爆炸载荷的特性和有效性的研究有限，它需要的材料比普通实心墙少得多。本文探讨了使用编织丝网的创新屏障类型的爆炸缓解效果。数值模型是针对峰值超压和最大脉冲的实验值开发和验证的，这些值由作者在先前的研究中发表。还研究了马赫杆形成对爆炸载荷的影响，这归因于爆炸装药在地表上方的小高度。发现马赫杆的形成显着影响压力表 ps1（障碍物前 1 m）处的峰值超压，而其对其余压力表的峰值超压和所有压力表的最大脉冲的影响小到可以忽略不计。这表明经过验证的数值模型可用于评估屏障后的爆炸缓解效果。根据所用仪表的数值结果，相对于自由场场景，使用编织丝网的障碍物可以实现高达 31.6% (41.6%) 的超压（脉冲）降低，其中在路径中不存在障碍物。冲击波的传播。此外，经过验证的数值模型用于通过分析超压时间历史和可视化冲击波传播来阐明抵抗空气冲击的屏障行为。这有助于指出实验中观察到的显着现象的根本原因。此外，还进行了两项参数研究，以讨论石笼壁厚和石笼墙之间的开口跨度对障碍物的爆炸缓解效果的影响。