低温冻结石门揭煤煤体温度及力学性能变化规律研究  

Study on the change law of temperature and mechanical properties of coal body in uncovering coal seam in low temperature freezing cross-cut

作　　者：周震 翟成[1,2] ZHOU Zhen;ZHAI Cheng(School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China;National Engineering Research Center for Coal Mine Gas Control,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116 [2]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：《工矿自动化》2021年第2期70-74,共5页Journal Of Mine Automation

基　　金：国家杰出青年科学基金项目(51925404);国家自然科学基金面上项目(51774278)。

摘　　要：为研究低温冻结石门揭煤煤体温度及力学性能变化规律,制作煤样时将U形铜管预埋在内并进行注液氮冻结,通过温度测量、红外热成像、单轴压缩等试验分析了不同冻结时间下煤样内部及表面温度和应力-应变变化特征。试验结果表明:随着冻结时间的增加,煤样内部及表面温度呈下降趋势;煤样表面最低温度位于U形铜管附近,煤样表面最高温度位于煤样边界;在压密阶段,随着冻结时间的增加,煤样应变逐渐减小,压密阶段缩短;在弹性变形阶段和屈服阶段,随着冻结时间的增加,煤样最大应力和弹性模量均呈增大趋势。In order to study the change law of temperature and mechanical properties of coal body in uncovering coal seam in low-temperature freezing cross-cut,U-shaped copper tubes are pre-buried and frozen with liquid nitrogen during the preparation of coal samples.The characteristics of internal and surface temperature and stress-strain changes of coal samples under different freezing times are analyzed by temperature measurement,infrared thermal imaging and uniaxial compression.The test results show that with the increase of freezing time,the internal and surface temperatures of coal samples show a decreasing trend.The lowest surface temperature of coal samples is located near the U-shaped copper tube,and the highest surface temperature of coal samples is located at the boundary of coal samples.In the compaction stage,with the increase of freezing time,the strain of coal samples gradually decreases and the compaction stage shortens.In the elastic deformation stage and yield stage,with the increase of freezing time,the maximum stress and elastic modulus of coal samples both increase.

关 键 词：石门揭煤 煤与瓦斯突出 低温冻结 煤体温度 煤体力学性能 

分 类 号：TD713[矿业工程—矿井通风与安全]