Dynamic response of rock sheds to successive rockfall impacts using lightweight expanded clay aggregate (LECA) cushions: An experimental and numerical study

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Hani Meree , Dongpo Wang , Shuaixing Yan , Mengjie Li , Shuai Lu , Marco Lovati , Fusheng Liu
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Abstract

This study investigates the effectiveness of Lightweight Expanded Clay Aggregate (LECA) as a novel cushion material mitigating repeated rockfall impacts on reinforced concrete (RC) slabs in rock sheds. Small-scale impact tests and finite element simulations analyze LECA particle size, cushioning material, block shape, and impact energy level influence on the dynamic response and damage. Results show LECA outperforms sand in attenuating impact forces and transmitted loads under successive impacts, which indicates a better protection effect on the substructure. Smaller LECA particles lead to wider stress distribution angles, longer impact durations, and lower peak forces. Block shape significantly influences impact force, with higher unified nose factors increasing forces. LECA cushions exhibit a dynamic amplification factor less than 1, indicating reduced transmitted loads compared to sand. Under high-impact energy conditions, the LECA cushion limits RC slab deflection within the elastic limit across all block shapes, while sand exceeds the elastic limit, potentially leading to structural failure. LECA mitigates flexural cracking and redistributes loads more uniformly, reducing overall RC slab damage compared to sand. However, localized failure modes require further optimization. This study highlights LECA's potential for enhancing rock shed structural safety and resilience against severe rockfall events, providing insights for optimal mitigation strategies.

使用轻质膨胀粘土骨料(LECA)衬垫的岩棚对连续落石冲击的动态响应:实验和数值研究
本研究探讨了轻质膨胀粘土骨料(LECA)作为一种新型缓冲材料,在减轻岩石棚中钢筋混凝土(RC)板受到的反复落石冲击方面的有效性。小规模冲击试验和有限元模拟分析了 LECA 颗粒大小、缓冲材料、块体形状和冲击能量水平对动态响应和损坏的影响。结果表明,在连续冲击下,LECA 在衰减冲击力和传递载荷方面优于砂子,这表明它对下部结构有更好的保护作用。LECA 颗粒越小,应力分布角越大,冲击持续时间越长,峰值力越小。块体形状对冲击力有很大影响,统一鼻系数越高,冲击力越大。LECA 缓冲垫的动态放大系数小于 1,这表明与砂子相比,LECA 缓冲垫的传递载荷更小。在高冲击能量条件下,LECA 缓冲垫可将所有砌块形状的 RC 板挠度限制在弹性极限范围内,而砂土则超过了弹性极限,可能导致结构破坏。与砂土相比,LECA 可减轻挠曲开裂并更均匀地重新分配荷载,从而减少整体 RC 板的损坏。然而,局部失效模式需要进一步优化。本研究强调了 LECA 在提高岩棚结构安全性和抵御严重落石事件的韧性方面的潜力,为优化缓解策略提供了启示。
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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