小错距上下煤层反向同采对上工作面巷道的影响

Influence of two coal faces with small horizontal separation in upper and lower coal seams mined in opposite directions on roadway of upper face

根据新集一矿已有的工程地质资料和科研成果建立模型,采用FLAC3D进行了数值模拟,并结合现场观测,研究了小错距上下煤层工作面反向同采时,上工作面巷道围岩应力、塑性区和变形情况,研究结果表明,上工作面巷道围岩变形在两工作面推进过程中呈现两个阶段的变化,该巷道围岩一定范围内发生塑性破坏是其围岩变形不断增长的主要原因,因此上工作面巷道支护的关键是加固其围岩的塑性破坏区,提高围岩的自承载能力。

The numerical model was established by FLAC3D software according to the exist- ing engineering geological data and scientific research results on No. 1 Colliery of Xinji Energy Company. Combined with the observation data from the coal mine, the stress of surrounding rock, the plastic region and the deformation of the roadway in the upper mining face were studied during the coal mining in opposite directions in the upper and lower coal seams with small hori- zontal separation. The results showed that the surrounding rock deformation of the roadway in the upper mining face waried in two stages in the advancing process of two mining faces. The plastic damage in some ：regions caused the continuous deformation of the surrounding rock. So the key of roadway support in the upper mining face is to strengthen the plastic damage area of surrounding rocks so as to improve the own bearing capacity of surrounding rocks.