不同冲击载荷下层状千枚岩压缩力学特性研究

doi:10.13722/j.cnki.jrme.2018.1084

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摘要为研究不同冲击速度下层状岩石动态力学特性，采用分离式霍普金森杆压杆装置对千枚岩进行动态冲击试验。研究冲击速度与层理倾角对层状岩石应力–应变曲线、破坏应变及应变率的影响；并从破碎形态、波传播特性、能量吸收等方面对岩石的破坏模式进行分析。结果表明，层状千枚岩试样破裂面类型分为4类，低冲击速度下，试样大多以单一的破裂面形式破坏，高冲击速度下多种破裂类型混合发生。随着冲击速度的增大，破裂类型增多，岩石平均破碎尺寸减小。岩石的动态破坏强度随倾角增加呈现先减小后增大的趋势，高冲击速度下这一趋势更加显著。同一冲击速度下，随倾角增大，应变率先减小后增大，试样破坏应变随倾角变化先增大后减小，表明低冲击速度下，22.5°倾角试样最易破坏，高冲击速度下，45°～67.5°倾角试样破坏最为容易，0°～22.5°倾角试样最难破坏。在低冲击速度下加载方向与层面处于45°～67.5°夹角时破碎效果较好，能量利用率较高；高冲击速度下加载方向与层面处于90°夹角时破碎效果最佳，能量利用率最高。

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	武仁杰1
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	李海波1
	李晓锋1
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	岳好真1
	2
	于崇1
	夏祥1

关键词 ：岩石力学, 层状岩石, 动态压缩, 力学特性, 破碎形态, 能量吸收

Abstract：In order to investigate compressive behaviours of layered rocks with different dip angles under different impact loads，dynamic compression tests of phyllite rocks were carried out using the split Hopkinson pressure bar system. The failure modes of rock are analyzed in terms of fracture morphology，wave propagation and energy dissipation. The fracturing modes of layered phyllite specimens can be divided into four types. At lower impact velocity，most of the specimens are destroyed by one type of fracture surface，and at higher impact velocity，a variety of fracture types are mixed. With the increase of impact velocity，the fracture modes increase and the average fragment size of rock decreases. The dynamic compressive strength performs a U-shaped change with the increase of dip angle，which is more significant at high impact velocity. The strain rate presents the inverted shoulder shape，and the fracture strain shows a shoulder shape with the increase of the dip angle. At lower impact velocity，the fragmentation effect is more pronounced when the loading direction is 45°–67.5°. At higher impact velocity，when the loading direction is 90°，the fragmentation effect is the best.

Key words： rock mechanics layered rocks dynamic compression mechanical properties fracture morphology energy absorption

引用本文:

武仁杰1，2，李海波1，李晓锋1，2，3，岳好真1，2，于崇1，夏祥1. 不同冲击载荷下层状千枚岩压缩力学特性研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3304-3312.
WU Renjie1，2，LI Haibo1，LI Xiaofeng1，2，3，YUE Haozhen1，2，YU Chong1，XIA Xiang1. Dynamic mechanical properties of layered phyllite subject to different impact loads. , 2019, 38(S2): 3304-3312.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.1084 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS2/3304

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