采用采场内平峒溜井开拓运输的露天矿,随着采矿场的下降,经常要进行溜井降段。目前,国内露天矿的溜井直径,一般为允许溜放矿石最大块度的3～5倍。为不使降段爆破产生的大块堵塞溜井,通常用的是贮矿爆破法,即首先将井筒贮满矿石,而后在降段井颈周围穿孔、爆破。这种工艺方法比较可靠,但很繁杂,尤 The use of open pit mining yard Pingtung open-pit transport, with the decline of the mining field, often have to go downhill. At present, the diameter of the open pit of a domestic open-pit mine is generally 3 to 5 times of the maximum lump of ore that can be allowed to slip. In order to avoid large choking blockage caused by descending blasting, the ore-blasting method is usually used. Firstly, the wellbore is stocked with ore and then perforation and blasting around the descending wellhead. This process is more reliable, but very complicated, especially