摘要
利用φ75 mm的分离式霍普金森压杆(SHPB)实验系统,对煤岩进行不同应变率下冲击压缩试验。实验结果表明:煤岩微细观特征复杂,离散性强;煤岩在低应变率下多呈轴向劈裂破坏,高应变率下呈现出压碎破坏;冲击过程中能量随着应变率的增大而增大,耗散能与应变率基本呈弱幂函数关系或线性分布关系;煤岩破碎块度分维与应变率呈线性相关,分形维数在1.7～2.2范围内,应变率越大,块度越小,分形维数越大,煤岩耗散能量越大。
The impacting compression test of coal rock was made by ~b75 mm Split Hopkinson Pressure Bar （SHPB） under different strain rates. The results show that the characters of coal rock are complicated and dispersed. Under low- er strain rate, the specimens presents an axial cleaving failure mode, while under higher strain rate, the specimens presents an crushing failure mode. Dissipation energy of specimens during process of the impacting increases with in- crease of strain rate, and relationship between them is a weak power function or linear distribution. The fractal dimen- sion of the fragmented coal rock ranged from 1.7 to 2.2, and there is a linear correlation between the fractal dimension and the strain rate. The larger the strain rate, the smaller the the greater the dissipation energy. fragmentation size, the larger the fractal dimension and
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2012年第9期1528-1534,共7页
Journal of China Coal Society
基金
国家重点基础研究发展计划(973)资助项目(2011CB201201
2010CB226802)
四川省青年科技基金资助项目(2012JQ0031)
关键词
煤岩
应变率
分离式霍普金森压杆
动态力学性能
能量耗散
块度分维
coal rock
strain rate
Split Hopkinson Pressure Bar （SHPB）
dynamic mechanical properties
energy dis-sipation
fractal dimension of fragmentation distribution
