ISSN 1003-8035 CN 11-2852/P
    赵雷,邹定富,张丽君,等. 坡面泥石流冲击被动柔性防护网耦合动力响应[J]. 中国地质灾害与防治学报,2024,35(0): 1-8. DOI: 10.16031/j.cnki.issn.1003-8035.202308031
    引用本文: 赵雷,邹定富,张丽君,等. 坡面泥石流冲击被动柔性防护网耦合动力响应[J]. 中国地质灾害与防治学报,2024,35(0): 1-8. DOI: 10.16031/j.cnki.issn.1003-8035.202308031
    ZHAO Lei,ZOU Dingfu,ZHANG Lijun,et al. Coupled dynamic response analysis of flexible barrier under slope debris flow[J]. The Chinese Journal of Geological Hazard and Control,2024,35(0): 1-8. DOI: 10.16031/j.cnki.issn.1003-8035.202308031
    Citation: ZHAO Lei,ZOU Dingfu,ZHANG Lijun,et al. Coupled dynamic response analysis of flexible barrier under slope debris flow[J]. The Chinese Journal of Geological Hazard and Control,2024,35(0): 1-8. DOI: 10.16031/j.cnki.issn.1003-8035.202308031

    坡面泥石流冲击被动柔性防护网耦合动力响应

    Coupled dynamic response analysis of flexible barrier under slope debris flow

    • 摘要: 针对目前被动柔性防护网相关性能检验仅针对落石冲击,缺乏坡面泥石流冲击作用下的耦合动力响应研究的现状,本文基于LS-DYNA,首先反演了某标称能级为5000 kJ的被动柔性防护网足尺落石冲击试验,对比分析了关键绳索内力、耗能器伸长量及缓冲距离,验证了计算模型有效性。其次,构建了ALE-FEM耦合计算模型,研究了坡面泥石流冲击作用下被动柔性防护网力学响应特征,并对比了与落石冲击工况下的差异。最后,以泥石流流速和冲击能量作为变量开展了参数化数值模拟,分析了冲击能量耗散转化特征,并从能量的角度探究了被动柔性防护网的极限防护能力。结果表明:被动柔性防护网可成功拦截标称能级下的坡面泥石流,且整体力学响应较落石冲击明显偏小;冲击能量主要转化为泥石流内能;被动柔性防护网可成功拦截4倍标称能级的坡面泥石流。

       

      Abstract: Currently, performance testing of flexible barrier only focus on rockfall impacts, lacking research on the coupled dynamic response under slope debris flow impact. In this study, based on LS-DYNA, a full-scale impact test with a nominal energy level of 5000 kJ of flexible barrier was firstly back-analyzed, comparing and analyzing the key rope forces, elongation of energy dissipators, and buffer distance to verify the effectiveness of the computational model. Next, an ALE-FEM numerical calculation model was built to investigate the mechanical response characteristics of the flexible barrier under slope debris flow impact, and compared them with rockfall impact conditions. Finally, parametric numerical simulations of debris flow velocity and impact energy were carried out to analyze the dissipation and transformation characteristics of impact energy and explore the ultimate protective capacity of flexible barrier from an energy perspective. The results showed that the flexible barrier can successfully intercept slope debris flows under the nominal energy levels, with overall mechanical responses significantly smaller than those under rockfall impacts. The impact energy mainly converted into internal energy of debris flows. Flexible barriers can successfully intercept slope debris flows up to four times the impact energy of rockfalls.

       

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