针对复合煤层软岩逆倾边坡形态优化问题,以扎哈淖尔露天煤矿北帮边坡为工程背景,基于刚体极限平衡理论,通过横采内排开采方式,从二维边坡稳定性分析角度出发,提出复合煤层边坡逐水平优化方法,确定扎哈淖尔露天煤矿北帮到界边坡参数.应用FLAC3D数值模拟软件分析了优化后的北帮边坡稳定性及滑坡机理.结果表明:受横采内排压帮开采方式产生的时空效应,最终确定扎哈淖尔露天煤矿北帮不同层位边坡稳定系数从上到下依次为1.20、1.10、1.05;逐水平优化后北帮整体边坡角增大至29°,深部陡帮开采边坡角增大至34°,滑坡力学成因机制类型为推动式;边坡岩体的主要破坏形式为拉-剪复合型.%According to a form optimized problem of a soft rock reversed dip slope in a composite seam,with a north highwall slope of Zhaha Naoer Surface Coal Mine as an engineering background,based on a rigid limit equilibrium theory,with a mining method with a crosscut and in pit dumping,from an analvsis view of a 2D slope stability,a level after level optimized method of the composition seam slope was provided and a slope parameter of north highwall boundary of Zhaha Naoer Surface Coal Mine was determined.A FLAC3D numerical simulation software was applied to analyze the slope stability and the landslide mechanism of the north highwall after the optimization.The results showed that with the time effect occurred bv the miniug method with the crosscut and in pit dumping on the slope,the stability parameters of the slope in the different layer of the north highwall in Zhaha Naoer Surface Coal Mine were finally determined as 1.20,1.10 and 1.05 individually from top to bottom.After the level after level optimization,the completed slope angle of the north highwall was increased to 29°,the mining slope angle of the deep steep highwall was increased to 34° and the cause mechanism type of the landslide mechanism was a pushing type.The main failure mode of the slope rock mass was a tensile-shear composition type.
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