榆家梁煤矿多煤层开采矿压显现规律研究

Roof pressure of multiple coal seams mining in Yujialiang mine

通过神东矿区榆家梁煤矿4^(-2),4^(-3)和5^(-2)近距离煤层群分层同采的实测对比,分析了近浅埋煤层群开采下煤层过采空区和煤柱的矿压显现规律,以及不同面宽、不同采高工作面的矿压显现变化规律。研究表明,下煤层开采过上煤层采空区时,工作面来压步距变短,强度平均增大29.0%.下煤层工作面过上煤层煤柱时的矿压影响最大,煤柱影响区的支架载荷增幅达41.4%.相同面宽条件下,随着采高的增大,工作面支架载荷增大。在工作面宽度为240~360 m范围内,宽度变化对矿压影响不明显。

By comparing site measurement of separate seam mining of 4^（-2）,4^（-3） and 5^（-2） coal seams in the close distance coal seam group of Yujialiang coal mine in Shendong mining area,the roof weighting of lower coal seam mining under upper coal seam gob and coal pillar,as well as the effect of different face width and different mining height in shallow coal seam group were analyzed. The result shows that the roof weighting step becomes shorter and the weighting strength becomes stronger by 29. 0%. The pressure of lower mining face under mined out area of upper coal seam is maximum. The increasing range of support pressure under coal pillar influential area reaches 41. 4%. Under the condition of the same face width,the support load increases with the increase of mining height. The influence of face width within240 ~ 360 m on roof pressure is not obvious.