不同瓦斯压力下煤体力学特性试验研究  

Experimental study on mechanical properties of coal under different gas pressure

作　　者：臧泽升 李忠辉[1,2,3] 钮月 刘帅杰[1,2] 宋晶晶 张全聪 ZANG Zesheng;LI Zhonghui;NIU Yue;LIU Shuaijie;SONG Jingjing;ZHANG Quancong(Key Laboratory of Gas and Fire Control for Coal Mines of Ministry of Education,China University of Mining and Technology,Xuzhou Jiangsu 221116,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou Jiangsu 221116,China;National Engineering Research Center for Coal Gas Control,China University of Mining and Technology,Xuzhou Jiangsu 221116,China)

机构地区：[1]中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室,江苏徐州221116 [2]中国矿业大学安全工程学院,江苏徐州221116 [3]中国矿业大学煤矿瓦斯治理国家工程研究中心,江苏徐州221116

出　　处：《中国安全科学学报》2021年第3期90-95,共6页China Safety Science Journal

基　　金：国家自然科学基金面上项目资助(51674254);山东省重大科技创新工程项目(2019JZZY020505)。

摘　　要：为研究瓦斯对煤体力学特性的影响,设计不同瓦斯压力条件下煤体单轴压缩试验,研究煤样力学参数及变形特征随瓦斯压力的变化趋势,探讨瓦斯对煤体力学性质的影响机制,得出单轴压缩下煤样力学参数,并记录煤样的破坏形态。研究结果表明:随瓦斯压力增大,应力-应变曲线压实阶段增大,弹性阶段缩小,失稳破坏后曲线缓慢下降,抗压强度和弹性模量单调减小,峰值应变单调增大;不含瓦斯煤样受载破坏产生的裂纹较为单一,含瓦斯煤样受载破坏后出现明显主裂纹及多向分叉裂纹,并出现局部煤体脱落现象。In order to study influence of gas on mechanical properties of coal,a uniaxial compression test of coal under different gas pressure was designed. Change trend of coal samples’ mechanical parameters and deformation characteristics along with gas pressure was studied to explore influence mechanism of gas on their mechanical properties,their parameters under uniaxial compression were obtained,and failure mode was recorded. The results show that with increase of gas pressure,compaction stage of stress-strain curve increases while elastic stage decreases,and the curve decreases slowly after instability failure.Meanwhile,compressive strength and elastic modulus decrease monotonously while peak strain increases monotonously. Cracks of coals with no gas produced under load are relatively simple,but gas-containing coal samples,after being damaged under load,see obvious main cracks and multi-directional bifurcation cracks as well as partial coal body shedding.

关 键 词：瓦斯压力 力学特性 单轴压缩 变形破坏 有效应力 

分 类 号：X936[环境科学与工程—安全科学]