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在中等傾斜矿床留矿法的放矿中,有两个主要問題沒有很好解决,第一是在浅孔留矿法中減少平场工作量,第二是減少矿石損失。本文拟对这两个問題加以探討。一、矿石放出时移动规律的一般概念 (一)单漏孔放矿时矿石移动規律的概念在留矿法放矿的条件下,采下矿石是在頂柱保护下放出的。当从下部漏孔放矿时,首先在矿石层中形成高为H、形状近似椭圓形的松散移动带(图1),在此带內的矿石发生移动。再继續放矿时,矿石表面就开始凹下。这时松散带頂端出現开口,并逐漸扩大,上部扩
There are two major problems that are not solved properly in the ore levying method of moderately tilted ore deposits. The first is to reduce the workload of the flat field in the shallow-hole retention method and the second is to reduce the ore loss. This article intends to discuss these two issues. First, the ore released when the general movement of the concept of (A) single-hole ore release ore mining law of the concept of ore mining method in the conditions of ore, mining ore is released under the protection of the top pillar. When the ore is drained from the lower leak hole, a loosely moving belt of height H, approximately oval shape is first formed in the ore bed (Fig. 1) where the ore within the belt is displaced. When the mine is continued, the surface of the ore begins to recede. At this time loose top with the opening appears, and gradually expanded, the upper expansion