综放开采导水裂缝带的发育特征与最大高度计算

Development Features and Max Height Calculation of Water Conducted Fractured Zone Caused by Fully Mechanized Top Coal Caving Mining

根据现场不同矿区的实测资料,探讨了综采放顶煤条件下导水裂缝带发育规律和特点,研究了综采放顶煤导水裂缝带最大高度的计算方法和计算公式。结果表明:综采放顶煤条件下,导水裂缝带的发育高度要比普采条件下、分层综采条件下大,分别增大1.37倍和2.31倍。综采放顶煤的裂高采高比与分层开采初次采动的裂高采高比基本相等,导水裂缝带的发育形态仍呈马鞍形。在进行水体下综采放顶煤开采时,可利用给出的计算公式进行导水裂缝带最大高度的计算。

According to the information measured in different mining areas,the development law and features of the water conducted fractured zone under the conditions of the fully mechanized top coal caving mining were discussed.Calculation formula for the max height of the water conducted fractured zone under the fully mechanized top coal caving mining was studied in the paper.The results showed that under the condition of the fully mechanized top coal caving mining,the developed height of the water conducted fractured zone would be higher than the conventional coal mining and the fully mechanized slice mining and would be increased by 1.37 times and 2.31 times individually than the other two mining operations.The fractured height and mining thickness ratio of the fully mechanized top coal caving mining would be basically the same to the fractured height and mining thickness ratio of the primary mining in the slice mining and the development pattern of the water conducted fractured zone would be a saddle shape.During the fully mechanized top coal caving mining under the water bodies,the given calculation formula could be applied to calculate the max height of the water conducted fractured zone.