Study on the change law of temperature and mechanical properties of coal body in uncovering coal seam in low temperature freezing cross-cut
-
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。Abstract: 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.
-
-
期刊类型引用(6)
1. 梁跃辉，石必明，岳基伟，王成，胡涛. 石门揭煤局部防突措施研究进展及展望. 煤矿安全. 2024(01): 1-13 . 
百度学术
2. 吴兵，黄来胜，李杨，李超，雷柏伟. 液氮冻结和冻融条件下煤体力学特性及裂隙演化教学实验设计. 实验技术与管理. 2024(03): 210-216 . 百度学术
3. 林海飞，罗荣卫，李博涛，秦雷，王裴，刘思博，杨二豪. 液氮冻结含水煤体能量耗散动态变化规律的试验研究. 煤炭科学技术. 2023(10): 119-128 . 百度学术
4. 孙修伟，梁为民，李敏敏，岳高伟，蔺海晓. 低温环境下重塑性煤体抗压性能研究. 煤矿安全. 2023(11): 25-32 . 百度学术
5. 许朋德，万恒州. 石门揭煤立体综合防突技术研究. 采矿技术. 2022(05): 129-131+145 . 百度学术
6. 刘军，卫彦昭，王蔚，张露伟. 基于THM耦合冻结煤层温度场演化规律研究. 中国安全生产科学技术. 2022(09): 89-96 . 百度学术
其他类型引用(1)
计量
- 文章访问数: 146
- HTML全文浏览量: 12
- PDF下载量: 10
- 被引次数: 7
下载:
