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以贵州某矿采动滑坡的地质灾害为工程背景,总结了西南地区山体浅埋煤层的特点,并根据有限元强度折减法对坡体安全性的评价原理,运用FLAC3D数值模拟软件对山体浅埋煤层坡体稳定性进行了数值模拟。研究结果表明,当采空区上方塑性区未全面贯通,随着该矿3022工作面的逐步开采,采空区上方塑性区不断发展(尤以坡脚位置的塑性区增加显著),此时矿区坡体易发生局部的滑坡地质灾害;当采空区上方塑性区全面贯通后,结合降雨入渗和风化作用的影响,矿区坡体易发生整体的滑坡地质灾害。
Based on the geological disasters caused by the mining landslide of a mine in Guizhou Province, the characteristics of the shallow seam coal seam in Southwest China are summarized. According to the evaluation principle of the slope safety by finite element strength reduction method, the numerical simulation software FLAC3D The stability of coal seam slope is numerically simulated. The results show that when the plastic zone above the goaf is not fully penetrated, with the gradual mining of 3022 working face of the mine, the plastic zone above the goaf continues to develop (especially the plastic zone at the foot of the slope increases significantly) Local landslide geological disasters are prone to occur in the slope; when the plastic zone above the goaf is fully penetrated, combined with the effects of rainfall infiltration and weathering, the overall landslide geological disasters are likely to occur in the slope of the mine.