动静组合加载含水煤样能量耗散特征分析

doi:10.13722/j.cnki.jrme.2015.0546

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摘要为探讨静载煤样受动力扰动作用下失稳破坏的能量耗散特征，利用改进SHPB试验系统对不同饱水状态煤样进行动静组合加载试验，分析含水煤样在冲击过程中能量耗散特征，得到试样的破碎块度、分维与能耗密度的关系。研究结果表明：3种饱水状态煤样的入射能与能耗密度均呈正相关；耗散率与透射率随着饱水时间的增加均呈逐渐降低，反射率随饱水时间增加而增加；试样破坏能耗密度随着饱水时间增长逐渐减小，动态强度降低，呈现饱水对煤样强度有弱化效应；相同能耗密度条件下，自然状态煤样的平均粒度大于饱水3，7 d，能耗密度与破碎粒度呈负相关，二者具有良好线性关系；饱水3和7 d煤样的能耗密度与破碎粒度拟合曲线明显偏低，表现含水对煤样破碎粒径影响显著；煤样破碎分形维数为1.67～2.25，自然状态煤样平均分形维数小于饱水3，7 d，煤样的分维数随着能耗密度的增加而提高，试样能耗密度与分形维数增幅均呈正相关，二者具有良好线性关系。

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	王文1
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	李化敏1
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	顾合龙1
	王晨1

关键词 ：岩石力学, SHPB试验, 动静加载, 能量耗散, 分维

Abstract：In order to study the feature of energy dissipation of unstable failure for static coal under dynamic disturbance，the coupled loads test of static and dynamic was proceed for different saturated state coal samples by the improved split Hopkinson pressure bar(SHPB) experimental system，the feature of energy dissipation of water-saturated coal samples was analyzed in the process of impact，and the relationship between fragmentation，fractal dimension and energy density of the coal samples were obtained. The results show that the positive correlation between incident energy and energy density of three kinds of saturated state coal sample were presented. With the increase of saturated time，dissipation rate and transmissivity are gradually reduced，the transmission rate are increasing. With the increase of saturated time，the energy density of the samples is gradually reduced，and the dynamic strength is reduced，the weakening effect was presented of saturated for the strength of coal samples. Under the condition of the same energy density，the average particle size of coal sample under the natural state is greater than the saturated 3，7 days，the negatively correlated between energy density and crushing granularity were presented，both have good linear relation. The fitting curve is obviously low of energy density and fragmentation of the saturated 3 and 7 days coal sample. The water has a significant effect on crushing particle size. The fractal dimension of the coal sample is 1.67–2.25，the average fractal dimension of coal sample under natural state is less than the saturated 3 and 7 days. With the increase of energy density，the fractal dimension of coal samples is increased. The positive correlated between energy density of sample and the amplification of fractal dimension was present，and both have good linear relation.

Key words： rock mechanics split Hopkinson pressure bar(SHPB) test static and dynamic loads energy dissipation fractal dimension

引用本文:

王文1，2，李化敏1，2，顾合龙1，王晨1. 动静组合加载含水煤样能量耗散特征分析[J]. 岩石力学与工程学报, 2015, 34(S2): 3965-3971.
WANG Wen1，2，LI Huamin1，2，GU Helong1，WANG Chen1. FEATURE ANALYSIS OF ENERGY DISSIPATION OF WATER-SATURATED COAL SAMPLES UNDER COUPLED STATIC-DYNAMIC LOADS. , 2015, 34(S2): 3965-3971.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.0546 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/3965

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