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以工作面沿正断层走向布置时断层两侧工作面开采为背景,采用FLAC~(3D)数值模拟,研究了下盘工作面接替上盘工作面开采及上盘工作面接替下盘工作面开采时,断层两盘煤柱应力及接替面超前支承应力的演化规律。研究表明:正断层一侧工作面采动时,下盘工作面开采的煤柱应力集中程度小于上盘,下盘工作面采动对上盘煤岩体应力的影响较大;断层两侧工作面采动时,上盘工作面接替下盘工作面开采,上盘断层煤柱应力集中程度较高,下盘工作面接替上盘工作面开采时,下盘断层煤柱应力集中程度较低;2种开采顺序下接替面超前支承应力集中明显,其中上盘工作面接替下盘工作面开采时,上盘工作面超前应力集中程度更大。
Taking the mining of working face on both sides of the fault as the working face being arranged along the normal fault plane, the FLAC (3D) numerical simulation was used to study the effect of the lower face working face replacing the upper face working face mining and the upper face working face to replace the lower face working face mining , The stress of two coal pillars in the fault and the evolvement law of the advance bearing stress of the succession face are analyzed. The results show that: when mining on the normal fault side, the stress concentration of coal pillar mining on the working face of the lower plate is less than that of the upper plate, and mining on the lower plate has greater influence on the stress of the coal and rock mass on the upper plate. Working on both sides of the fault Face mining, the upper plate face to replace the next face mining, the upper plate of coal stress higher concentration of stress, the lower plate face to replace the face of mining, the lower plate stress concentration of coal pillars lower; In the two kinds of mining sequences, the stress of the leading surface of the replacement surface is obviously concentrated. When the upper working face replaces the working face of the lower working face, the leading stress concentration of the upper working face is larger.