深露天矿边帮,除上部(20～100m)外,通常由硬岩构成。硬岩体的特点是,在没有不利方向的弱面存在的条件下,即使边坡角达到70°～80°、边坡高度达300～500m 或更大(由碳酸盐岩类构成的河谷边坡),也不可能出现滑坡和崩塌。与自然边坡不同,由硬岩构成的露天矿边帮废止角,即使在没有切割边坡的大的弱面时,只在个别情况下超过50°。这首先是因为在边帮废止时边帮上保留很多运输平台和安全平台。因此,即使台阶削坡角很陡(α≥70°),边帮倾角总体上不 Deep open pit side to help, in addition to the upper part (20 ~ 100m), usually composed of hard rock. Hard rock mass is characterized by a slope height of 300 to 500 m or more, even in the presence of weak surfaces without unfavorable orientations, even with a slope angle of 70 ° to 80 ° (valleys of carbonate rocks Slope), landslide and collapse are also impossible. Unlike natural slopes, the open pit side of hard rock helps the scrap angle of repose, even in the absence of a large weak face that cuts the slope, in more than 50 ° in some cases. This is primarily because of the retention of many transport platforms and safety platforms while the border was abolished. Therefore, even if the step cutting angle is steep (α ≧ 70 °), the side inclination is not generally present