分期开采与横采横扩共同特点,都是加陡露天矿边帮,达到基建工程量少、投产快、生产剥采比小、经济效果好的目的。不同之处,在于前者以临时境界间接加陡边帮,后者是以大工作帮坡角直接加陡边帮。如图1所示一矿体ELQG开采的一期境界为AWPG,二期境界为TLQG。两期的边坡角均等于γ。φ为缓帮坡面角,φ′为陡帮坡面角,α为矿体倾角。若矿体缓帮分期开 The common features of staged mining and horizontal mining and transverse expansion are that the steep open pit side is added to achieve the purpose of less infrastructure construction, quick production, low stripping ratio and good economic results. The difference is that the former indirectly adds a steep edge to the temporary boundary, and the latter uses the large work to help steeply increase the slope angle directly. As shown in Figure 1, the first stage of ore body ELQG mining is AWPG, and the second stage is TLQG. Both sides of the slope angle equal to γ. φ is gentle slope slope angle, φ ’is steep slope slope angle, α is the orebody dip angle. If the ore slow to help open staging