浅埋中硬特厚煤层综放工作面覆岩运动破坏规律研究

Study on Movement and Failure Law of Overlying Strata of Fully Mechanized Top Coal Caving Face in Shallow Medium-hard Extremely Thick Coal Seam

以酸刺沟煤矿为试验矿井，采用深基点和数值模拟试验对采动覆岩运动破坏规律进行研究。数据结果表明：酸刺沟煤矿综放开采覆岩两带高度分别为49m和133m；从煤层至地表，随着埋深的减小，岩层起始运动时间滞后，且除部分基点外，基点的绝对位移量整体呈降低趋势；覆岩运动时期，基点多呈现1～4个不等的波峰值，其中，3个钻孔中，ZS1钻孔覆岩运动绝对速度值最大，约1480mm／h，说明工作面覆岩存在短时间急剧下沉形式和长时间阶段非均匀下沉2种形式。

Taking Suancigou coal mine as test mine, deep base point and numerical simulation test was conducted to studythe movement and failure law of overlying strata under mining effect. The results show that, the heights of overburden ＂twozones＂, in top coal caving of Suaneigou coal mine, were 49m and 133m; from coal seam to earth surface, as the depthdecreases, the starting time of rock movement lags, and except some basis points, the absolute displacement of basepoints shows a decreasing trend; during overlying strata movement, most of the base points shows 1 to 4 wave peaks,among all of the three boreholes, the absolute speed of Zsl drilling overlying strata is the biggest, implying there are twoforms of sinking, the rapid sinking in short period, and the staged non - uniform sinking in long period.