采场下伏不同距离被保护层应力场演化特征研究

Study on Stope underlying Different Distance Protected Layer Stress Field Evolution Features

为深入了解开采上保护层的卸压特征,通过开采上保护层底板煤岩体应力变化的数值模拟,对不同距离被保护层的应力变化情况进行了研究。研究表明:随着层间距的增大,被保护煤层的卸压范围越小,卸压程度越低,被保护煤层卸压范围内应力变化也由"W"型向"V"形转化。

In order to deeply Understand mining upper protective layer pressure relief features, protected layer stress change is studied by different interlayer distance, through mining upper.protective layers floor coal rock mass stress numerical simulation. The results show that：with the increase of interlayer distance, protected seam pressure relief range is smaller, pressure relief rate is lower, the protected coal seam pressure relief range stress changing from ＂W＂ to ＂V＂ shape transformation.