淮南矿区深部综采工作面覆岩两带高度发育特征研究

Study on Height Development Characteristics of Two Zones of Overlying Strata in Deep Fully-mechanized Face in Huainan Coal Mining Area

为了确定深部综采工作面覆岩两带发育高度,采用经验公式预测、数值模拟及现场岩芯质量指标3种方法对覆岩两带高度及发育特征进行了研究,结果表明:煤层采出后,两带发育特征呈现出"马鞍型"形态,且最大发育高度位于工作面开切眼及停采线上部。采用3种不同方法计算得出的两带高度分别为42.29～45.77,57,53～55 m。通过对比发现,数值模拟结果与现场实测结果较为接近,而采用经验公式预测结果偏小。最终确定深部综采工作面覆岩两带高度为55 m。

In this paper,study was made on the height of the caving zone and the water flowing fractured zone of overlying strata and their development characteristics by using the experience formula prediction,the numerical simulation and the site core quality index method in order to determine the development height of two zones of the overlying strata in the deep fully-mechanized coal face.The results showed that the development characteristics of two zones appeared to a 'saddle' type after the coal was mined out and the maximum development height was located on the upper of the open-off cut of the face and the terminal line.The heights of two zones that were calculated with three different methods are respectively 42.29-45.77 m,57 m and 53-55 m.It is found through comparison that the numerical simulation result was more close to the site measured result,and the result obtained by experience formula prediction was small.The finally determined development height of the caving zone and water flowing fractured zone of the overlying strata is 55 m.