Technical Center, Datong Coal Mine Group Corporation Limited

为解决大同矿区两硬薄煤层综采工作面顶板难以控制的问题,以晋华宫矿8224薄煤层综采工作面为研究对象,通过现场监测的方法分析工作面矿压规律,对工作面推进过程中支架工作阻力及回采巷道的变形情况进行监测分析。结果表明:工作面基本上是从中部首先来压,然后向两帮扩展,呈现出分段和迁移的来压特征;薄煤层上覆岩层运动对工作面推进的影响比中厚煤层的小,由于工作面采场顶板为难控顶板,在两硬开采条件下,有必要采取人工强制放顶,使顶板有效垮落,保证两硬薄煤层综采工作面安全回采。

In order to solve the roof hard control problem of the fully-mechanized coal mining face in the thin seam with a hard roof and hard coal, based on No.8224 fully-mechanized coal mining face in the thin seam of Jinhuagong Mine as the study object, the site monitoring and measuring method was applied to analyze the mine pressure bump law of the coal mining face and the monitoring and analysis were conducted on the working resistances of the powered supports during the coal mining face pushing forward process and the deformation situation of the mining gateway. The results showed that generally the roof weighting would be occurred at the middle of the coal mining face, then the roof weighting would be expanded to the two sidewalls of the coal mining face and the sectional and migrated roof weighting features w ould be occurred. The overburden strata movement above the thin seam would have a lower influence of the coal mining face pushing forward than the medium thick se am. Due to the roof of the coal mining face was hard to control, under the condition of the hard roof and hard coal, an artificial forced roof caving should be taken necess arily and the roof could be effectively caved to ensure the safety mining of the fully-mechanized coal mining face in the seam with the hard roof and hard coal.

国家重点基础研究发展计划(973计划)资助项目(2013CB227903)；