真三轴动静组合加载饱水煤样动态强度特征研究

doi:10.13722/j.cnki.jrme.2019.0227

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摘要为探讨含水煤样在动静组合加载条件下煤样的受力特性及强度变化特征，分析在真三轴与常规三轴动静组合加载条件下动态强度的差异性，采用真三轴动静载霍普金森冲击加载系统对自然和饱水7 d煤样进行试验。结果表明，饱水7 d煤样在X轴方向的动态强度比自然煤样平均低约17.43%，Y轴方向的动态强度比自然煤样平均高约15.88%，Z轴方向的动态强度比自然煤样平均高约14.23%。随着中间主应力的变化，自然和饱水7 d煤样的动态强度均表现先增大后减小的现象，且转折点均为中间主应力为6 MPa，表明煤样对三轴静载约束力的依赖性，揭示饱水对煤样的强度及变形影响比较显著。分析了2种加载系统作用下煤样内部含水裂隙扩展方式的差异性是导致煤样强度变化规律相反的主要原因。

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	王文1
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	张世威1
	LIU Kai3
	王伸1
	李东印1
	李化敏1

关键词 ：岩石力学, 真三轴SHPB试验, 动静加载, 饱水煤样, 动态强度

Abstract：In order to investigate the mechanical and strength variation characteristics of coal specimens under dynamic and static combined loading conditions and to analyze the difference of dynamic strength performances between true triaxial and conventional triaxial conditions with static and dynamic combination loads. The natural and 7 d saturated coal specimens were compressed and impacted using the true triaxial Hopkinson bar systerm at Monash University. Experimental results show that, under the true triaxial dynamic and static combination loading，the dynamic strength of the saturated 7 d coal specimens in the X-axis direction is about 17.43% lower than that of the natural coal specimens，while the former is about 15.88% and 14.23% higher than the later respectively in Y- and Z-axis directions. With the variation of the intermediate principal stress，the dynamic triaxial strengths of two types of coal specimens show a initial increasing and then decreasing trend with a turning point corresponding to the intermediate principal stress of 6 MPa. The coal specimens exhibit a distinct confinement dependence，and the effect of water on the strength and deformation of coal is also significant. Besides，comparison between the test results of true triaxial and conventional triaxial static-dynamic combination loads indicates that the opposite trend of the coal strength is mainly attributed to the different propagation modes of the internal water bearing fractures.

Key words： rock mechanics true triaxial split Hopkinson pressure bar(SHPB) test static-dynamic loadings water-saturated coal specimens dynamic strength

引用本文:

王文1，2，张世威1，LIU Kai3，王伸1，李东印1，李化敏1. 真三轴动静组合加载饱水煤样动态强度特征研究[J]. 岩石力学与工程学报, 2019, 38(10): 2010-2020.
WANG Wen1，2，ZHANG Shiwei1，LIU Kai3，WANG Shen1，LI Dongyin1，LI Huamin1. Experimental study on dynamic strength characteristics of water-saturated coal under true triaxial static-dynamic combination loadings. , 2019, 38(10): 2010-2020.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0227 或 http://www.rockmech.org/CN/Y2019/V38/I10/2010

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