摘要
针对煤岩特性,令其微元强度服从截尾正态分布,引入变异系数参量,建立了煤岩破坏过程中的统计损伤模型。结果表明:模型在反映煤岩破坏过程演变特征时更合理。参数μ与δ分别反映了煤岩宏观强度和微元强度分布均匀性,宏观强度与参数μ呈正相关关系,与参数δ呈负相关关系。进一步对无因次宏观强度分析,发现其大小只与变异系数有关。
For coal and rock properties, we make coal element strength subject to truncated normal distribution, and then introduce a variation coefficient to establish a statistical damage model applied to coal seam damage process. The results show that this model shows more reasonability in showcasing the evolution characteristics of damage. Parameters μ and δ, respectively,respond to the uniformity distribution of coal seam macro-scale failure strength and element strength; macroscpic strength is positively correlated with parameter μ, while it is negatively correlated with parameter δ. By further analysis of dimensionless macro-scale strength, we find that it’s related to variation coefficient only.
出处
《煤矿安全》
北大核心
2017年第11期13-16,共4页
Safety in Coal Mines
基金
山西省煤基重点科技攻关资助项目(MQ2014-04)
关键词
煤岩
统计损伤
破坏强度
变异系数
煤层气开发
coal and rock
statistical damage
breaking strength
variability coefficient
coalbed methane development
