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Tensile Properties and Multiparameter Response Characteristics of Coal under Different Loading Rates
Natural Resources Research ( IF 5.4 ) Pub Date : 2022-06-29 , DOI: 10.1007/s11053-022-10083-2
Bin Liu, Yixin Zhao, Hao Wang, Yirui Gao, Zhuang Sun

Coal and rock dynamic disaster is a major threat to coal mine safety worldwide. To further understand the tensile properties and multiparameter response characteristics of coal at different loading rates, Brazilian splitting tests were carried out for coal specimens with different loading rates, and their acoustic emission (AE), infrared radiation temperature (IRT), and deformation field were monitored synchronically. The tensile properties, multiparameter response characteristics and energy evolution were analyzed, and the correlations among AE, IRT, deformation field, and dissipated energy were discussed. The results showed that the maximum AE hit rate and AE absolute energy correlated positively and negatively with the loading rate, respectively. The standard deviation (SD) evolution of IRT for coal specimens under different loading rates showed a trend of “fluctuating rise → slow increase → fast increase → rapid rise,” and the SD evolution of horizontal displacement in the coal specimens under different loading rates showed a trend of “slow increase → linear increase → rapid increase.” The energy evolution of the coal specimens was the same under different loading rates, while the dissipated energy increased with loading rates and correlated positively with peak stress. Correlation coefficients ranged from 0.23 to 0.99, indicating that there was positive correlation among the parameters. With increasing loading rates, the correlation coefficients increased first and decreased before increasing again.



中文翻译:

不同加载率下煤的拉伸性能及多参数响应特性

煤岩动力灾害是全球煤矿安全的主要威胁。为进一步了解煤在不同加载速率下的拉伸性能和多参数响应特性,对不同加载速率下的煤样进行了巴西劈裂试验,分别计算了煤样的声发射(AE)、红外辐射温度(IRT)和变形场。同步监控。分析了拉伸性能、多参数响应特性和能量演化,讨论了AE、IRT、变形场和耗散能之间的相关性。结果表明,最大AE命中率和AE绝对能量分别与加载率正相关和负相关。不同加载速率下煤样IRT的标准差(SD)演变呈“波动上升→缓慢增加→快速增加→快速上升”的趋势,不同加载速率下煤样水平位移的SD演变表现为呈现“缓慢增长→线性增长→快速增长”的趋势。不同加载速率下煤样的能量演化是相同的,而耗散能量随加载速率增加而增加,并且与峰值应力呈正相关。相关系数在0.23~0.99之间,说明各参数之间存在正相关。随着加载率的增加,相关系数先增加后减小,然后再次增加。”,不同加载速率下煤样水平位移的SD演变呈现“缓慢增加→线性增加→快速增加”的趋势。不同加载速率下煤样的能量演化是相同的,而耗散能量随加载速率增加而增加,并且与峰值应力呈正相关。相关系数在0.23~0.99之间,说明各参数之间存在正相关。随着加载率的增加,相关系数先增加后减小,然后再次增加。”,不同加载速率下煤样水平位移的SD演变呈现“缓慢增加→线性增加→快速增加”的趋势。不同加载速率下煤样的能量演化是相同的,而耗散能量随加载速率增加而增加,并且与峰值应力呈正相关。相关系数在0.23~0.99之间,说明各参数之间存在正相关。随着加载率的增加,相关系数先增加后减小,然后再次增加。而耗散的能量随着加载速率的增加而增加,并且与峰值应力呈正相关。相关系数在0.23~0.99之间,说明各参数之间存在正相关。随着加载率的增加,相关系数先增加后减小,然后再次增加。而耗散的能量随着加载速率的增加而增加,并且与峰值应力呈正相关。相关系数在0.23~0.99之间,说明各参数之间存在正相关。随着加载率的增加,相关系数先增加后减小,然后再次增加。

更新日期:2022-06-29
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