范各庄矿5煤层顶板采动变形破坏规律

Deformation and failure of coal seam roof in Fangezhuang coal mining

针对范各庄煤矿5煤层顶板稳定性问题,以范各庄煤矿的大量钻孔资料为基础,结合煤矿顶板的岩性经验分类理论,将范各庄煤矿5煤层顶板合理的分为坚硬型顶板、中硬型顶板和软弱型顶板,并依据相应经验公式计算出5煤层采动后顶板冒落带高度和顶板导水裂隙带高度.研究结果表明:范各庄煤矿5煤层顶板按开采冒落带高度可分为高冒落带、中冒落带、低冒落带以及微冒落带;按开采导水裂隙带高度可分为强导水裂隙带、中导水裂隙带以及弱导水裂隙带。研究初步确定了矿区顶板稳定性特征,为范各庄煤矿5煤层的安全开采提供了数据支持.

In view of the top failure of 5 coal bed in Fanggezhuang coal mine. Based on abundant log of drill hole and combine the experience classify theory, divide the seam top into solid type, middle solid type and flaccid type and figure out the degree of collapse area and the degree of producing fracture in Fanggezhuang coal mine.The research find there has high collapse area, middle collapse area, low collapse area and tiny collapse area according the heigh of collapse; good producing fracture, ordinary producing fracture and bad producing fracture according the heigh of producing fracture. Research clarify the feature of the top failure and provides data to the safely mining of the coal seam 5 in Fangezhuang coal mine.