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随着矿区开采方式由露天开采转向井工开采,边坡稳定性逐渐降低,因此为保证矿区的安全生产,亟待对矿区开采边坡稳定性做出准确评价。依据平朔东露天矿工程项目,运用Slide软件对边坡危险区进行搜索与治理方案,并利用有限元软件ABAQUS建立二维模型,采用强度折减法分析不同井采方向下平朔东露天矿边坡稳定性。结果表明:典型剖面Ⅰ通过治理后边坡稳定系数从1.05增值到1.20,达到安全生产要求,并发现剖面Ⅱ采用逆坡开采较顺坡坡体变形小;矿山边坡局部受井采扰动影响明显,计算发现当开采至80 m时,边坡安全系数骤降至1.65,因此在后续的开采中要加强危险坡面的监测与评价工作。
As the mining method changes from open pit mining to underground mining, the stability of slopes gradually decreases. Therefore, in order to ensure the safe production in mining areas, it is urgent to make an accurate assessment on the stability of the mining slope. According to the Pingshuo East open pit project, Slide software was used to search and control the danger zone of the slope, and the two-dimensional model was established by the finite element software ABAQUS. The strength reduction method was used to analyze the slope of Pingshuo East open pit mine stability. The results show that the typical sectionⅠis increased from 1.05 to 1.20 after treatment, and meets the requirements of safety production. It is found that the deformation of section Ⅱ is less than that of the slope along the slope; the slope of the mine is significantly affected by wellbore perturbation, The calculation results show that the safety factor of slope plunges to 1.65 when the mining height is up to 80m, so the monitoring and evaluation of dangerous slope should be strengthened in the subsequent mining.