摘要
为确定特厚煤层分层开采时,千米钻孔在下分层中合理布置层位,提高千米钻孔瓦斯抽采效果,以亭南煤矿205工作面下分层瓦斯抽采为例,采用理论计算和Flac3D数值模拟的方法,对采动过程底板破坏规律进行研究.由理论计算可知,底板以下6 m位置为抽采钻孔布置的临界层位,低于该层位有发生塌孔危险.数值模拟得出同样结果,采场底板以下4 m位置,煤体发生剪切和拉张破坏;底板下6 m,以剪切破坏为主;底板下8 m,煤体受采动影响不明显塑性变形较小.研究结果表明:将千米钻孔布置在底板下6 m位置,可保持长期有效地抽采下分层煤体瓦斯.据此在工程试验布置千米抽采钻孔,抽采效果较好,实现了对千米定向钻孔在下分层的位置进行了优化.
In order to determine the reasonable layout of the drilling holes in the lower layer, and improve the effect of gas drainage by drilling hole in the lower layer, this paper adopted theoretical calculations and Flac3D simulation, and studied the mining process floor failure regularity of working face 205 in TingNan coal mine. According to the theoretical calculation, the critical layer position of gas drainage drilling is 6m below the floor. The drilling holes below this level are at the risk of collapse. Same results were obtained through numerical simulation. Coal shear and tensile failure occur 4m below the floor, and mostly shear failure occurs 6m below the floor; coal mass 8m under the floor is not obviously affected and the elastic deformation is small. The results of study show that the kilometer drilling hole placed 6m below the bottom can maintain long-term effective drainage under stratified coal gas. According to the engineering test on the layout of kilometer drilling hole, better drainage result was obtained, which realized the optimization of kilometer directional drilling hole position.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2017年第5期449-455,共7页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金青年基金项目(51304111)
关键词
瓦斯抽采
千米定向钻孔
应力分布
煤体裂隙
层位优化
gas drainage
kilometer directional drilling
stress distribution
coal mass fracture
layer optimization
