垮落顶板下膏体充填开采二分层方案探讨

The discussion on the paste backfilling mining of the second layer under the caving roof

太平井田六南02一分层煤层采用垮落法开采完毕,为控制二分层开采引起一分层采后的导水裂隙高度继续发育,二分层拟采用膏体充填开采。通过对02二分层工作面区域水文地质及工程地质条件分析,引入"等效采厚"概念,对比公式计算及预测数据,选取了接近实际的导水裂隙带发育高度,确定了合理的防水安全煤岩柱尺寸。六南02二分层工作面现已安全回采结束。

After the caving method for first layer coal in 6south 02in Taiping mining area,the second layers coal use paste backfilling mining in order to control the height development of water flowing fractured zone in first layer.The equivalent mining thickness principles have been proposed based on the conditions of hydrogeology and engineering geology in second layer working face.In view of comparison of calculation formula and predicted data,the closer to actual height of water flowing fractured zone have been selected.The reasonable size of waterproof coalrock pillar has been determined.The second layer working face stope already finished safely.