不同冲击倾向煤样表面温度场与变形场演化特征

采用实验手段,研究单轴压缩过程中,冲击倾向性和非冲击倾向性煤样表面变形场和温度场演化特征。运用白光散斑分析方法,对样品表面变形局部化带演化进行数据分析,发现非冲击倾向性煤样局部化出现在加载的弹性阶段,而冲击倾向性煤样出现在塑性阶段,冲击煤样的变形场演化要较非冲击煤样剧烈;冲击煤样与非冲击煤样的变形局部化内部区域温度整体较外部区域高,且变化规律基本相同,而局部化内外温差变化与其相反;冲击煤样的绝对温度变化较非冲击样品变化大;冲击煤样的温度场对应的变形局部化演化较非冲击煤样简单;基于不同煤样的全岩矿物分析及黏土矿物成分分析,对比了冲击煤样与非冲击煤样内部晶体、非晶体及黏土矿物的含量,从而探讨内部组分对宏观温度场和变形场的影响。

Evolution of the surface temperature field and deformation field of different impact proneness coal specimens

It took experimental methods to study the evolution characteristics of surface deformation field and temperature field of coal specimens with uniaxial compression.The impact and non-impact proneness propensity coal specimens were selected to research.The white light speckle method was used to analysis the surface deformation localization evolution of the specimens.It can be concluded that the deformation localization of non-impact proneness coal specimens appeares in elastic stage；but the impact proneness one appeares in plastic stage；the impact one is more severe than the non-impact one for deformation field.The temperature within the deformation localization is higher than outer region，and the same variation for both the impact and non-impact proneness propensity coal specimens；however，the temperature difference between inside and outside localized has an opposite variation；the absolute temperature of impact specimens has a bigger change than the non-impact ones；deformation field corresponding temperature field，which the impact ones are latter simply.Based on the whole rock mineral analysis and clay mineral composition analysis of different coal specimens，internal crystal，amorphous and clay mineral content were compared between impact and non-impact coal specimens，so as to explore the influence of the macroscopic temperature field and deformation field caused by the internal components.