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针对桑树坪煤矿松软厚煤层综放工作面大跨度切眼顶煤留设难题,利用FLAC3D模拟不同跨度下切眼围岩塑性区的发育范围,并提出阶梯式切眼施工技术。结果表明:相比沿底留顶煤切眼,阶梯式切眼围岩塑性区范围无明显变化,顶底板拉伸屈服区域基本不变,顶板主要屈服区为扩巷部分顶煤,一次巷副帮围岩拉伸屈服范围有明显扩大;阶梯式切眼可有效降低大跨度松软煤层留顶煤难度,避免底板三角煤问题,有效提高煤炭采出率和工作面推进速度。
In order to solve the problem of long-span cut-off top coal caving in fully mechanized top coal caving mining face in soft and thick coal seam of Sangshuping Mine, FLAC3D is used to simulate the development of plastic zone in surrounding rock of cut-off under different spans and to propose stepped cut-off construction technology. The results show that there is no obvious change in the plastic zone of the stepped cuttings compared with the coal cut along the bottom, and the yield area of the top and bottom slabs is basically unchanged. The main yield zone of the roof is the top coal of the expansion road, The range of tensile yielding of the surrounding rock is obviously enlarged. The stepped cutting can effectively reduce the difficulty of the top coal in the long-span soft coal seam, avoid the triangle coal in the bottom plate, effectively improve the coal recovery rate and the advancing speed of the working face.