摘要
为了研究急倾斜走向长壁放顶煤开采顶板裂隙发育规律及其对瓦斯抽采的影响,结合弹塑性力学和断裂力学相关理论分析了急倾斜煤层裂隙扩展的力学准则,将瓦斯流动通道进行了分区:瓦斯孤立通道区、瓦斯过渡通道区和瓦斯网络通道区;对宝积山煤矿急倾斜特厚煤层走向长壁放顶煤开采在不同煤层倾角条件下上覆岩层裂隙发育规律进行了分析,得到了随着角度变化瓦斯流动通道区域形态的变化规律。研究结果表明:瓦斯网络通道区上部为高位人工导向通道贯穿的主要区域,该区域分布范围随着煤层倾角增大而趋于工作面上端头,其高度也增大;根据数值模拟和理论计算可确定瓦斯抽采方案,在工程实践中取得良好效果。
In order to study the roof fracture development and its effect on gas drainage during steep long wall full-mechanized caving mining,combined with relevant theories of elastic-plastic mechanics and fracture mechanics,the mechanics criterion of fracture development in steep coal seam mining has been analyzed,and the gas flow channel has been partitioned as gas isolated channel area, gas transition area and gas network area. Furthermore, the overlying rock fracture development during steep super high coal seam long wall top coal caving mining under the condition of different dip angle of coal seam in Baojishan coal mine has been analyzed,and the changing rules of gas flow channel’s area configu-ration with the seam angle changing has been obtained.The results of the study shows that the upper part of gas network area are the main areas that the artificial guide channel should run through,and the distribution range of the areas tends to the upper face end and its height increases with the seam angle increasing. The gas drainage plan can be determined according to numerical simulation and theoretical calculation,which will achieve good effect in engineering practice.
出处
《采矿与安全工程学报》
EI
北大核心
2014年第5期809-813,共5页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2011CB201204)
中央高校基本科研业务费项目(2011YZ05)
