摘要
以大淑村矿4号煤双条带开采作为2号煤下保护层,采用数值模拟和现场监测等方式,研究下保护层双条带开采的卸压效果。研究结果表明,4号煤层的双条带开采能够有效保证煤层的稳定性,且在70 m采宽下对2号煤层的卸压范围及倾向保护范围最大,此时2号煤体膨胀量最大,为21.6 mm,占煤体4.2‰,最大压缩量为16.6 mm,占煤体3.2‰;通过钻孔电视对2号煤层的特征进行监测,发现被保护层煤体产生了离层裂隙,其瓦斯含量、瓦斯压力等指标比开采前降低了50%和60%,验证了双条带开采方式的可行性。研究结果为煤层瓦斯抽采技术的发展提供参考。
Taking the double strip mining of No.4 coal seam in Dashucun Mine as the lower protective layer of No.2 coal seam,the pressure relief effect of double strip mining of lower protective layer was studied by means of numerical simulation and field monitoring.The results show that the double strip mining of No.4 coal seam can effectively ensure the stability of coal seam,and the pressure relief range and tendency protection range of No.2 coal seam are the largest under 70 m mining width.At this time,the expansion of No.2 coal seam is the largest,which is 21.6 mm,accounting for 4.2‰ of coal body,and the maximum compression is 16.6 mm,accounting for 3.2‰ of coal body.The characteristics of No.2 coal seam were monitored by borehole TV,and it was found that the separated layer cracks were produced in the protected coal seam,and the gas content and gas pressure were reduced by 50% and 60% compared with those before mining,which verified the feasibility of the double strip mining method.The research results provide a reference for the development of coal seam gas extraction technology.
作者
石德忠
Shi Dezhong(Jizhong Energy Fengfeng Group Co.,Ltd.,Handan 056300,China)
出处
《煤炭与化工》
2025年第11期23-29,共7页
Coal and Chemical Industry
关键词
双条带开采
数值模拟
卸压范围
被保护层
瓦斯含量
double strip mining
numerical simulation
pressure relief range
protected layer
gas content
