综采放顶煤导水裂缝带发育规律分析

Study on Development Law of Water Conducted Fracture Zone in Top Coal of Fully Mechanized Top Coal Caving Mining Face

为了研究潞安矿区综采放顶煤条件下覆岩破坏规律和导水裂缝带发育规律,在王庄煤矿6206综放工作面施工了3个"两带"高度观测孔,进行了系统的观测研究,取得了冒落带、导水裂缝带发育高度,求取了预测导水裂缝带最大高度的经验公式。结果表明,综采放顶煤条件下导水裂缝带异常发育,在同样采高的条件下导水裂缝带最大高度比分层综采增大1.32倍,比普采增大2.23倍,发育形态仍成"马鞍型"。综采放顶煤条件下裂高采高比平均为19.75,与普采、分层综采初次采动条件下的裂高采高比相近,基本符合初次采动导水裂缝带的发育规律。

In order to study the overburden strata failure law and water conducted fracture zone development law under the condition of the fully mechanized top coal caving mining in Lu＇an Mining Area, three high level survey boreholes in the roof caving zone and the water con- ducted fracture zone were made in the 6206 fully mechanized top coal caving mining face in Wangzhuang Mine. A systematic survey and study were conducted. The heights of the roof falling and the water conducted fracture zone were obtained. An experiment formula to pre- dict the max height of the water conducted fracture zone was obtained. The results showed that the water conducted fracture zone was ab- normally developed under the condition of the fully mechanized top coal caving mining. The max height ratio slicing fully mechanized mining in the water conducted fracture zone under the same thick mining condition would be increased by 1.32, which would be 2.23 times larger than the conventional coal mining. The development mode would be in ＂saddle form＂. Under the fully mechanized top coal caving mining, the fracture height and mining thickness rate would be 19.75 in average, could be closed to the fracture height and mining thickness rate under the initial mining condition of the conventional mining and slicing fully mechanized mining and would basically meet the development law of the initial mining water conducted fracture zone.