基于FLAC^(3D)的“三软”煤层错层位巷道布置开采数值模拟研究

Numerical simulation study on stagger arrangement roadway layout mining method for “three soft” coal seam based on FLAC^(3D)

论文基于错层位采煤法具有巷道布置层位和方式灵活、接续工作面巷道能巧妙的避开支承应力峰值的影响,并且还能提高煤炭回收率等优点,结合河南某矿"三软"煤层实际开采条件为背景,提出了采用错层位巷道布置采煤法开采"三软"煤层。与传统采煤法相比,错层位采煤法将首采工作面巷道布置在较为坚硬的顶板岩层中,改善了巷道围岩条件,通过FLAC3D数值模拟研究分析发现:在掘进和回采期间,错层位巷道围岩能承受较大支承应力,巷道围岩变形较小,巷道围岩和实体煤一侧支承应力影响范围较小,巷道掘进和维护较为容易;接续工作面巷道布置首采工作面采空区下方的应力降低区,巷道掘进较为容易。错层位采煤法开采"三软"煤层具有显著优势,对类似地质条件的"三软"煤层开采具有一定的指导和借鉴意义。

The paper based on the advantages of stagger arrangement roadway layout mining method, such as the roadway layout flexible, avoiding the influence of bearing stress peak value cleverly, improving the coal recovery rate,etc,combining the actual mining conditions of ＂three soft＂ coal seam of Henan mine, the authors put forward using the stagger arrangement mining method to mining ＂three soft＂ coal seam. Compared with the traditional mining method, the roadway of stagger arrangement would be dug in the roof strata which was relatively hard,improving the condition of surrounding rock of roadway,by using FLAC3D numerical simulation to research and study which found that the roadway surrounding rock of the stagger arrangement can withstand larger abutment stress, had the less deformation, and smaller stress influence range of roadway and the entity coal side during the period of excavation and stopping, thus the roadway excavation and maintenance became easier, the roadway of the next working face was arranged under thestress reduction of the first working face, which was good for roadway driving, so the stagger arrangement mining method had significant advantages to the mining of ＇~three sort＂coal seams, and which had some guidance and reference for the mining of ＂three soft＇coal seams.