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一地质条件试验工作是在某矿辛1号采场内1号充填天井进行的(小中段高为20米)。天井直径为2米的圆形断面,实际高度18米。所穿过的岩石有铅锌、黄铁矿、大理石及带晶洞的方解石。普氏硬度系数f=6～8,一般凿岩性和爆破性均较好。但有方解石的晶硐,最易使炮孔发生偏差和卡钎,同时,对爆破也不利。因此在凿岩时把岩层都作了详细的记载,并绘制成岩层剖面图(如图1)以作爆破时控制装药量的参考。
A geological condition test work is carried out in No. 1 pit of No. 1 mine in a mine (the height of middle and small section is 20 meters). Patio diameter of 2 m circular section, the actual height of 18 meters. The rocks passed through were lead and zinc, pyrite, marble and calcite with craters. Props hardness f = 6 ~ 8, the general drilling and blasting are better. However, the calcite crystal cave, the most easy to make the deviation and the drill hole brazing, at the same time, blasting is also unfavorable. Therefore, during rock drilling, the rock formations are all described in detail, and a section diagram of the rock formation (Figure 1) is drawn to control the charge when blasting.