According to the effect of F24 large reverse fault on multi seams mining in Pansan mine ,the evolution of stress and plastic zone at the different size of preserving fault pillar in 11 coal seam and 13 coal seam were studied by using FLAC3D ,and then the rational size of safe coal pillar was put forward .With the decrease of 11 coal pillar ,it was found that stress concentration transfer to the hanging wall of the fault ,and the stress concentration zone at left goaf increases gradually because of the influence of 11 coal seam mining to 13 coal seam mining .At the same time ,the plastic zone near fault gradually increases and is connected with the stope at last .To prevent water inrush ,the pillar of 40 meter and 60 meter are determined respectively .It is proved that the sizes of pillar are rational on field engineering .%针对潘三矿多煤层回采受F24大型逆断层影响 ,利用FLAC3D研究11煤和13煤留设不同尺寸断层煤柱情况下 ,采场应力和塑性区演化规律 ,从而提出合理的断层煤柱留设尺寸.研究发现 ,随着11煤回采留设煤柱的减小 ,应力集中逐渐向断层上盘转移 ,而13煤回采受11煤回采的影响 ,煤柱的减小使采空区左侧应力集中区域逐渐增大 ;同时 ,断层附近塑性区范围逐渐增大并最终与采场塑性区导通 ,为防止突水事故 ,确定煤柱留设尺寸分别为40m、60m ;现场工程验证该留设尺寸是合理的.
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