摘要
为了研究煤岩不同细观参数均质度对冲击倾向性的影响,利用细观颗粒流软件模拟了弹性模量和黏结强度分别服从Weibull分布的非均质煤岩,并通过进行单轴压缩试验分析了破坏过程中的能量积聚与释放,研究了不同均质度m的煤岩冲击倾向性。分析表明:颗粒弹性模量均质度m与宏观弹性模量之间呈幂函数关系,m越大,峰前积聚的能量越多,冲击倾向性越明显;颗粒间黏结强度均质度m与宏观抗压强度之间呈幂函数关系,m越大,峰前积聚的能量越多,煤岩破坏由塑性向脆性转化,峰后能量释放速度加快,冲击倾向性越明显;黏结强度均质性影响峰前的能量积聚和峰后的能量释放,而弹性模量均质性只影响峰前的能量积聚,黏结强度均质性对冲击倾向性的影响大于弹性模量,起主导作用。
To research the influence of different heterogeneous parameters on bursting liability of coal, the uniaxial compressing tests of heterogeneous coal based on Weibull distribution with different elastic modulus and bonding strength were simulated by using particle flow code（PFC）. The accumulation and release of energy was studied, and bursting liability of coal with different heterogeneities was researched. The results indicate that the elastic modulus het- erogeneity has a power function relation with macroscopic modulus. With the increase of the modulus heterogeneity, more energy is accumulated before peak strength. The bursting liability of coal is more possible at high modulus hetero- geneity. The bond strength heterogeneity has a power function relation with compressive strength. With the increase of the strength heterogeneity, more energy is accumulated before peak strength, and the energy release speeds up after peak. The coal failure type transforms from plastic to fragili strength heterogeneity. The bond strength heterogeneity with ty. The bursting liability of coal is more possible at high influence on before and after peak strength has more impact on bursting liability of coal compared with modulus heterogeneity with influence only on before peak.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2014年第2期280-285,共6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(2010CB226805)
教育部高等学校博士学科点专项科研基金资助项目(20123718110013)
山东省"泰山学者"建设工程专项经费资助项目
关键词
颗粒流
煤岩冲击倾向性
细观非均质
particle flow
bursting liability of coal
microscopic heterogeneity
