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基于目前大倾角煤层大采高开采的研究成果和工程实践,运用理论分析和数值模拟分析对大倾角大采高工作面底板破坏滑移特征进行了分析。研究结果表明,造成大倾角煤层底板破坏滑移的因素有内因和外因,其中主要原因是应力的“二次分布”。大采高工作面底板中下部应力释放的范围大于底板中上部应力释放范围;采高对底板破坏滑移具有一定的影响,即采高越大底板位移和应力变化越大;底板的破坏区分为拉应力破坏区、压应力破坏区和塑性破坏区3个区;描述了大倾角工作面底板破坏滑移的演变规律。
Based on the research results and engineering practice of large mining height in the high angle coal seam, the characteristics of failure and slippage of the floor with large dip and large working face are analyzed by theoretical analysis and numerical simulation. The results show that there are internal and external factors that cause the failure and slippage of the coal seam floor under deep inclination. The main reason is the “secondary distribution” of stress. The range of stress release in the middle and lower part of the floor of the large mining face is larger than that in the upper part of the floor. The mining height has a certain influence on the failure and slippage of the floor, ie the bigger the mining height is, the larger the displacement and stress change of the floor are; Tensile stress failure zone, compressive stress failure zone and plastic failure zone 3 areas; Describe the evolution of large-angle working face floor slip.