采矿与安全工程学报2017，Vol.34Issue(3)：594-600,7.DOI:10.13545/j.cnki.jmse.2017.03.027
冲击载荷作用下煤的破坏特性试验研究
The failure characteristics of coal under impact load in laboratory
摘要
Abstract
In order to study the dynamic failure properties of coal,impact tests of coal under different strain rates were carried out through Split Hopkinson Pressure Bar (SHPB).The dynamic mechanical characteristics of coal and the changes of mechanical parameters were analyzed,the failure forms of coal were studied,and the self-similarity features of coal under impacting failure were described quantitatively through fractal theory.The results have shown that there is basically no sunken section in the dynamic stress-strain curves and the curve can be divided three phases:the phase of linear elasticity,the phase of elastoplasticity,and the phase of plastic softening;the laws of average and maximum strain rate are in exponent with the increase of air pressure,and the dynamic elasticity modulus and compressive strength increase linearly with the strain rate;coal under impact loading has two failure forms of cleavage and fragmentation;the obvious self-similarity of failure coal is found and fractal dimensions increase linearly with the strain rate;the relationship between dynamic compressive strength and elastic modulus are approximately positive correlation.The research results have a certain theoretical and practical value to solving practical problems in deep mining.关键词
煤体/SHPB/力学特性/破坏形态/块度分形Key words
coal mass/SHPB/mechanical property/failure mode/block fractal分类
矿业与冶金引用本文复制引用
王登科,刘淑敏,魏建平,姚邦华,彭明..冲击载荷作用下煤的破坏特性试验研究[J].采矿与安全工程学报,2017,34(3):594-600,7.基金项目
国家自然科学基金项目(51104059,51304072) （51104059,51304072）
教育部“创新团队发展计划”项目(IRT1235) （IRT1235）
河南省基础与前沿技术研究计划项目(132300413203) （132300413203）
河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地开放课题项目(WS2012B07) （WS2012B07）
第十二期“步步高”大学生科技攀登计划项目(SA-2016-073) （SA-2016-073）
