摘要
针对煤炭开采引发的诸多环境问题,煤矿地下水库技术为缓解煤水冲突的提供了有效途径。文章聚焦干湿循环对煤样特性的影响展开研究。选取内蒙古神华煤矿B区煤层煤样,加工成标准圆柱形试样,采用非破坏性水浸装置进行干湿循环处理,采用DYS1000型岩石试验机开展单轴加载试验。研究发现:随着干湿循环次数增加,煤样干湿质量差增大、吸水性增强、质量损失加剧,P波速度呈指数衰减,内部结构被破坏;应力应变曲线表明,弹性阶段材料弹性模量降低,峰值应力减小,破坏形式从脆性向塑性转变;声发射事件数量增多且起始点提前,损伤发展更连续。研究成果有助于全面认识水煤相互作用,揭示含水煤样力学和结构损伤机制,为煤矿地下水库煤柱坝稳定性研究提供参考。
In the context of the environmental challenges posed by coal mining and the utilisation of coal mine underground reservoir,this study examines the impact of dry and wet cycling on the properties of coal samples.Coal samples from the B-area coal seam of the Shenhua Coal Mine in Inner Mongolia were selected for the study,and standard cylindrical samples were prepared.The samples were then subjected to dry and wet cycling using a non-destructive water immersion device,followed by uniaxial loading tests using the DYS1000 rock testing machine.The findings revealed that with an increase in the number of dry and wet cycles,there was a rise in the dry and wet mass difference of the coal samples.Water absorption was enhanced,mass loss was intensified,the P-wave velocity decayed exponentially,and the internal structure was damaged.The stress-strain curve showed that the elastic modulus of the material decreased in the elastic phase,the peak stress decreased,and the damage form changed from brittle to plastic.The number of acoustic emission events increased and the onset point was advanced,and the damage development was more continuous.The research results obtained can facilitate a comprehensive understanding of the interaction between water and coal,reveal the mechanical and structural damage mechanism of water-bearing coal samples,and provide a reference for the stability study of coal pillar dams in underground reservoirs of coal mines.
作者
姬月虎
任雪峰
聂鹏飞
JI Yuehu;REN Xuefeng;NIE Pengfei(Huangtaolegai Mining Co.,Ltd.,Inner Mongolia,Wushen 017300,China)
出处
《煤》
2025年第12期75-78,102,共5页
Coal
关键词
地下水库
干湿循环
声发射
应力-应变
峰值强度
groundwater reservoir
dry and wet cycle
acoustic emission
stress-strain
peak strength
