中文摘要：

兖州矿区某煤矿部分煤炭资源位于河流下方,采用分层开采。为提高其开采上限,以该矿5304-1工作面开采实际为背景,根据现场地面钻孔成像观测结果分析,确定其导水断裂带高度为51.7 m；以工作面实际地层资料为基础,通过对煤层顶底板岩层组合和结构特征的分析,运用FLAC3D数值模拟方法,通过反复试算和修正,以及对煤层顶板导水断裂带的发育特征进行分析,得出厚煤层分层开采后导水断裂带的空间发育特征及发育高度；采用现场钻孔观测和数值模拟相结合的方法,确定出厚煤层分层开采顶板导水断裂带发育高度为52 m,为河下开采提高开采上限和防水煤柱的留设提供重要的参考依据。

英文摘要：

Part of coal resources in a mine in Yanzhou Coal Mining Area is under the river and coal is extracted by slice mining. In order to improve the upper limit of coal mining, the height of the water-flowing fractured zone of 53041 working face of this mine was determined as 51. 7 m by taking the coal mining of this face as the background and according to the ground borehole imaging observations;based on the actual strata data of the working face and through the analysis on the composition and structural characteristics of the seam roof and floor rock strata, the space development characteristics and development height of the water-flowing fractured zone after the slice mining of the thick seam were obtained by using FLAC3D numerical simulation, through the repeated calculations and correction and the analysis on the development characteristics of the seam roof water-flowing fractured zone;with the method by combining the site borehole imaging observation and numerical simulation, the height of the water-flowing fractured zone of the thick seam with slice mining was determined as 52 m, this research result provided an important reference basis for the improvement of the upper limit of coal mining under river and the reasonable retaining of the waterproof coal pillars.