综放面覆岩破裂数值模拟及高位钻场参数优化

Numerical simulation of overlying strata fracture in fully-mechanized top-coal caving face and parameter optimization of high-level drilling site

基于准确划分煤层上覆岩层"竖三带"的煤层法向分布范围,根据鹤壁九矿长壁综放工作面开采技术条件和岩石力学性能等参数,建立力学模型,运用岩石破裂过程分析软件RFPA2D,对上覆岩层随工作面推进时的变形、冒落情况进行了数值模拟,得到了顶板由变形到破坏的全过程及其破坏的规律。用经验公式对覆岩裂隙带高度进行了计算,综合判定了工作面上覆岩层的裂隙带高度为23.5～55m,高位钻场抽采参数优化后,其平均抽采量达到7.36m3/min,较好地解决了采空区瓦斯涌出问题。

Based on the exact dividing of normal distribution range of ＂vertical three zones＂ in overlying strata above coal seam,the mechanical model was established according to the mining conditions in fully-mechanized top-coal caving face in Hebi ninth coal mine and the mechanical parameters of rocks,by using the analysis software（RFPA 2D） of rock fracture process.The deformation and falling of overlying strata were simulated as the working face advanced,and the whole process of roof from distortion to damage and its damage laws were obtained.The height of fractured zone in overlying strata was in the range of 23.5 to 55 m calculated in the light of empirical formula.After the gas drainage parameter optimization of high-level drilling site,the average flow of drained gas attained 7.36 m3/min,solving the gas emission problem in the goaf.