“两硬”围岩孤岛工作面矿压显现规律研究

Study on Strata Behavior Law of Island Working Face With Hard Roof and Hard Floor

为了更好地对寺河二号井"两硬"围岩(即坚硬顶板和坚硬底板)地质条件下的工作面开采工作进行掌握和指导,采用相似模拟试验、现场监测相结合的方式,对寺河矿二号井IX4302孤岛工作面矿压显现规律进行了分析研究。研究结果表明,受"两硬"围岩和孤岛形态的双重影响,工作面周期来压明显,基本顶初次来压步距为45.7m,周期来压步距平均为16.4m,但动载系数普遍较小;超前支承压力峰值位置位于煤壁前方11m处,回采巷道变形较小,对类似条件工作面安全高效回采提供了参考和指导。

In order to further understand and guide the mining of Sihe Mine No. 2 coal mine IX4302 island face with hard roof and hard floor, similar simulation test was conducted combining with field monitoring to study the strata behaviors of the target island face. And the results show that, under the dual influences of hard surrounding rock and island shape of the working face, the periodic weighting is obvious, the main roof first weighting step distance is 45. 7m, and the average periodic weighting step distance is 16.4m, the abutment pressure peak is at 11 m in front of the coal wall, mining roadway deformation is small. The study could provide references and guidance for safe and effective mining under similar conditions.