Study on bedding effect and damage constitutive model of slate under compressive dynamic loading
OU Xuefeng1，2，ZHANG Xuemin2，ZHANG Cong2，FENG Han2，ZHOU Xianshun2，ZHAO Hong1
(1. School of Civil Engineering，Changsha University of Science and Technology，Changsha，Hunan 410114，China；
2. School of Civil Engineering，Central South University，Changsha，Hunan 410075，China)
Abstract：To investigate the anisotropic behaviour of layered slate under dynamic loadings，five groups of dip angles(θ = 0°，30°，45°，60° and 90°) of layered slate in Jiangxi Province were tested by the split Hopkinson pressure bar(SHPB). The critical failure mechanical characteristics and failure mechanism of the slate under high strain rates were demonstrated. In addition，a damage constitutive model was established by the component combination model theory，which considers the damage of macroscopic layers. Both experimental and theoretical results illustrates that the peak values of stress-strain curves are different under different dip angles，but the overall trends are similar，including both elastic compression stage，plastic stage，plastic strengthening stage and post-peak curve after reaching the peak value. The bedding plane plays significant role in the failure of the slate except for the case with θ = 0°. The main failure modes are mainly composed by splitting failure through the bedding，shear failure in the bedding direction，slip failure and splitting failure along the bedding. The dynamic damage constitutive models of layered rock mass take the superposition effect of micro-damage and macro-damage of layered rock mass into consideration. Comparing the predicted results with the experimental results，the proposed model can describe the variation of stress-strain curve of layered rock mass under dynamic loadings，and more importantly it agrees well with the peak strength，which is helpful to accurately demonstrate the deformations and failure behaviors of layered slate under high strain rates.
欧雪峰1，2，张学民2，张 聪2，冯 涵2，周贤舜2，赵 虹1. 冲击加载下板岩压缩破坏层理效应及损伤本构模型研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3503-3511.
OU Xuefeng1，2，ZHANG Xuemin2，ZHANG Cong2，FENG Han2，ZHOU Xianshun2，ZHAO Hong1. Study on bedding effect and damage constitutive model of slate under compressive dynamic loading. , 2019, 38(S2): 3503-3511.
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2019, Vol. 38 
