近距离煤层群保护层开采双重卸压效果分析

Study on Comparative Analysis For Protecting Layer Mining in Closedistance Coal Seams

为了分析在近距离煤层群条件下多保护层开采时下伏煤层开采的卸压效果,采用数值计算及现场验证的方法对保护层开采时下伏煤层开采卸压程度进行了研究,得到保护层开采时,被保护层在开采过程中的垂直应力、塑性区变化规律。现场抽采数据表明:在多重卸压作用下,被保护层的抽采浓度以及纯量都保持较高值,卸压效果明显。

In order to analyze in close distance seam group with protective layer mining pressure relief effect. Use methods of numerical calculation and field test of protective layer mining,protected layer mining, protected by vertical stress, plastic zone change rules in the mining process. The extraction data show that： in the multiple pressure relief effect, the protected layer extraction concentration and pure amount have maintained a higher value