采动裂隙椭抛带分布特征的相似模拟实验分析

煤层开采后,覆岩采动裂隙分布特征与卸压瓦斯抽采密切相关。基于相似原理,进行了覆岩采动裂隙分布特征的物理相似材料模拟实验。根据实验中裂隙带及压实带的拟合曲线,说明覆岩采动裂隙分布特征是椭抛带形态。通过观测覆岩裂隙的裂隙密度、离层率、带宽及碎胀特征,进一步研究了采动裂隙椭抛带的发育、发展规律。最后在试验分析的基础上,推导出采动裂隙椭抛带的空间分布数学模型,为确定合理的卸压瓦斯抽采钻孔终孔位置提供了依据。

Model Experiment Analysis of Distribution Features of Mining Fissure Elliptic Paraboloid Zone

After mining,the distribution features of mining fissure in overlying stratum are closely related to the suction of relieved methane.Based on the principle of similarity,we apply model experiment to study the distribution features of mining fissure in overlying stratum.On the basis of the coordinate data of the fissure zone and compaction zone,it is explained that the distribution feature of mining fissure is Elliptic Paraboloid Zone.Through observing the bed-separated ratio,fissure density,zone width and the coal expansion feature,the development laws of the mining fissure Elliptic Paraboloid Zone were further studied.At last,on the basis of experiment analysis,the mathematical model of the Elliptic Paraboloid Zone was deducted.