变厚煤层综采工作面覆岩运动规律研究

Study on overburden Strata Movement Law at Fully-mechanized Mining Face in Thickening Coal Seam

利用数值模拟以及现场实测等手段,对岱庄煤矿变厚煤层4320综采工作面覆岩运动规律进行了研究。研究结果表明:数值模拟试验发现变厚煤层在开采过程中两帮及煤层厚度变化处出现应力集中,塑性破坏严重,顶板破碎,顶板下沉量相对较大,随着模型开挖进行,煤层厚度变化处塑性区的范围呈现变大趋势;4320工作面初次来压步距为22.8 m,周期来压步距平均为11.8 m,超前支承压力影响范围大约为工作面前50 m;由于应力集中,煤层厚度变化处顶板破碎、难管理,但对于上覆岩层的运动情况影响较小。

By numerical simulation and field measuring, overburden strala movement law of thickening coal seam in 4320 tully mecha- nized mining face of Daizhuang Mine was done. The results show that stress concentration occurs at two sides of the working lace and the thickening zone during mining in numerical simulation tests, the roof of thickening zone has a large relative subsidence, serious plastic failure, roof broken, and the plastic zone enlarges with the mining of model ; the first weighting interval is 22.8 m and the periodic weighting length is 11.8 m averagely in 4320 working face, and the influence scope of advanced abutment pressure is about 50 m in front of the working face ; the roof of the thickening zone is broken and difficult to be controlled for stress concentration, but has little affect to the overburden strata movement.