大采高工作面煤壁片帮深度分析

Analysis on Spalling Depth of Coal Wall in Large-height Mining Face

煤壁片帮是制约大采高综合机械化开采工作面安全高效开采的主要因素之一,为了掌握煤壁片帮规律,利用FLAC3D数值模拟软件得到了工作面前方煤壁主应力的分布规律,进而将煤壁简化为压杆。根据压杆理论,分析了完整性较好的煤壁的挠度特征,得出煤壁的最大变形点,即剪切破坏的突破点。给出了煤壁片帮深度的计算公式,并通过现场实测,对该公式进行了验证。

Coal wall spalling is one of the main factors restricting the safe and high efficient mining for fully - mechanized coal caving with large mining height. In order to make clear the law of coal wall spalling, the distribution law in the front of the coal mining wall was analyzed with numerical software FLAG3D, therefore the coal wall was simplified into a pressure bar. Based on the theory of pressure bar, the deflection feature of coal wall with good integrity was analyzed, and the maximum deflection position of coal wall namely the breach position of shear failure was found out. A formula to calculate the depth of coal wall spalling was given, and was verified through field measurement.