超充分采动走向主断面水平移动实测数据分析

Horizontal movement measured data on tend towards main section during supercritical extraction mining

通过大量实测数据发现,当工作面达到超充分采动时,采空区中部存在大量水平移动现象,这与传统水平移动预计模型不符。针对这一问题,利用多个超充分采动区地表走向主断面观测站实测水平移动数据进行分析研究,确定采空区走向主断面水平移动曲线随着工作面推进过程中的动态发展过程。研究发现:(1)采空区中部水平移动值与地表最大下沉值呈线性关系,比值在0.2左右;(2)工作面切眼侧水平移动极值与停采线一侧水平移动极值之差与采空区中部水平移动值基本相等。基于上述结论,利用一定比例的下沉值对传统概率积分法水平移动结果进行修正。修正模型可以较好地解释采空区中部系统性水平移动的现象,且对于切眼和停采线两侧水平移动极值的计算结果较为准确。研究结论在完善水平移动预计模型,提高矿区变形预计精度方面具有重要意义。

A large number of measured data found that when the working surface reaches supercritical extraction mining,there is a large number of horizontal movement in the central goaf,which is not consistent with the traditional horizontal movement prediction models.To solve this problem,the measured horizontal movement data of the tend towards main section of the supercritical extraction mining were used for analysis and research,and determine the development stage process of horizontal movement curve on the tend towards main section with the working surface advance.Research finding:(1)The horizontal movement value in the central goaf is proportional to the surface maximum surface subsidence value,the value is around 0.2;(2)The difference between the horizontal movement extreme of the cutting side and the side of the stop line,it is basically equal to the horizontal movement value in the middle of the mined goaf.Based on the above conclusions of this study,the horizontal movement result of the traditional probability integral method is corrected by using a certain proportion of subsidence value.The modified model can well explain the phenomenon of systemic horizontal movement in the central goaf,and the calculation results of the horizontal moving extremes at the open-off cut and stop mining line are more accurate.The conclusion is of great significance to perfect the probability integral prediction model and improve the predicted accuracy of the mining area.