"两软一硬"不稳定煤层工作面覆岩"两带"发育高度研究

为探索禹州煤田西南部云盖山煤矿二矿软煤、软底和硬顶(简称“两软一硬”)及开采煤层厚度变化较大的不稳定煤层顶板垮落带和导水断裂带发育高度,采用现场钻孔成像技术、经验公式类比分析和数值模拟综合研究方法,对该矿23301采煤工作面顶板覆岩垮落带、导水断裂带高度进行了分析,获得了工作面在非充分采动垮落和充分采动垮落条件下“两带”高度量化取值,垮落带最大高度为14.4 m,导水断裂带最大高度为50.0 m,认为现场钻孔成像技术可用于采动覆岩“两带”发育高度的计算。研究结果对研究区预采掘顶板水害防治及顶板支护具有较重要的参考价值。

Study on the height of overburden strata in two zones of “two soft and one hard” unstable coal seam working face

In Yungaishan No.2 Coal Mine in southwest Yuzhou Coalfield,in order to study the height of caving zone and water-conducting fault zone of unstable coal seam that with soft coal,soft bottom and hard top(abbreviated as“two soft and one hard”)and the thickness of coal seam varies greatly,the height of roof overburden caving zone and water-conducting fault zone of 23301 coal mining face were analyzed by using in-situ borehole imaging technology,empirical formula analogy analysis and numerical simulation,two belts.quantitative values were obtained for the working face under the non-full mining caving and fully mining caving,the maximum height of caving is 14.4 m,the maximum height of water flowing fractured zone is 50.0 m,find the borehole imaging technology can be used in the mining strata height calculation of two belts.The results of this study have important reference value for the prevention and control of roof water damage and roof support.