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冲击载荷下土的动态力学性能研究

DOI: 10.11858/gywlxb.2011.05.010, PP. 444-450

Keywords: ,霍普金森压杆,冲击,动态,高应变率

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Abstract:

利用分离式霍普金森压杆(SplitHopkinsonPressureBar,SHPB)技术,研究了土体在不同应变率条件下的冲击动态力学性能,发现土体有明显的应变率效应,与静载相比,冲击载荷下土的动强度和动模量均有很大的提高。根据实验曲线的特征,以一根线性弹簧和两个不同松弛时间的Maxwell体并联的粘弹性模型来表达土体的损伤型粘弹性本构模型,两个Maxwell体分别表示土体的低应变率响应和高应变率响应,模型的数值拟合曲线与实测动态本构曲线具有较好的一致性。拟合参数表明,土体对低应变率的响应与混凝土相同,对高应变率的敏感性远远高于混凝土。

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