矿业科学学报2025，Vol.10Issue(4)：573-583,11.DOI:10.19606/j.cnki.jmst.2025036
放顶煤开采导水裂缝带高度确定的关键问题分析
Some key problems on estimation of height of water-conducting fractured zone for thick coal seam top coal caving
摘要
Abstract
The height of water-conducting fractured zone is an important indicator for ensuring safe min-ing of coal resources under water bodies.In view of the problems and deficiencies to quote empirical formula for top coal caving in thick coal seams,the basis of the empirical formula is analyzed and the applicable conditions,which are large mining areas,single-layer mining thickness of 1～3 m,and cu-mulative mining thickness not exceed 15 m for coal seam slice mining,are clarified and emphasized.Based on the field measurement results of the top coal caving property and top coal recovery rate,the concept of effective mining thickness for top coal caving in thick coal seams is proposed.The effective mining thickness is closely related to the recovery rate of the top coal caving and the height of the water-conducting fractured zone increases with the increase of the effective mining thickness.It is shown that the height of the water-conducting fractured zone based on the effective mining thickness can effectively avoid the underestimation caused by the increase of the top coal recovery rate in top coal caving.Based on the evolutionary law of the overburden and surface subsidence from subcritical to critical or super-critical mining,the Boltzmann function is introduced to express the relationship between the critical mining degree and the height of water-conducting fractured zone.A method for calculating the maxi-mum height of the water-conducting fractured zone is provided based on the degree of critical mining.Taking fully into account of the recovery rate of the top coal caving and the degree of critical mining,a technical reference is provided for scientifically calculating the maximum height of the water-conducting fractured zone in thick coal seam top coal caving and the safe mining under water bodies or aquifers can be ensured.关键词
放顶煤开采/导水裂缝带高度/顶煤采出率/采动程度/有效采厚Key words
top coal caving/height of water-conducting fractuned zone/top coal recovery/critical mining degree/effective mining thickness分类
矿业与冶金引用本文复制引用
崔希民,MALINOWSKA A,车宇航,孙帅辉,李培现,孙灏,许志华,袁德宝,蒋金豹,赵玉玲..放顶煤开采导水裂缝带高度确定的关键问题分析[J].矿业科学学报,2025,10(4):573-583,11.基金项目
国家自然科学基金(52274169) （52274169）
鄂尔多斯市科技重大专项(ZD20232304) （ZD20232304）
河北省自然科学基金生态智慧矿山联合基金(E2020402086) （E2020402086）
