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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 means of numerical simulation and field measurement, the law of overlying strata movement of 4320 fully mechanized coal mining face in Daizhuang Coal Mine was studied. The results show that: the numerical simulation test shows that stress concentration occurs in the two thick coal seams and the thickness of coal seam in the process of mining, the plastic damage is serious, the roof is broken and the roof subsidence is relatively large. As the model excavation progresses, The range of the plastic zone in the area of change shows a trend of increasing. The initial pressure step of 4320 working face is 22.8 m, the average pressure step length in the cycle is 11.8 m, and the influence range of advance support pressure is about 50 m ahead of working face. Due to the stress concentration, The roof is broken and difficult to manage due to the change of thickness, but it has less influence on the overlying strata movement.