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一地質条件試验工作是在某矿辛1号采場內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。所穿过的岩石有鉛鋅、黄鉄矿、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釺,同时,对爆破也不利。因此在凿岩时把岩层都作了詳細的記載,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。二凿岩工作在开工之前,預先将試验地点开凿成高2.5米,长寬各3米的空間,并安設两套风水管与照明綫路。为了准确地掌握炮眼位置与方向,将預先描繪有炮眼排列图的木质方向盘,安放在預定天井脚的位置
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, yellow ore, marble and calcite with craters. Props hardness f = 6 ~ 8, the general drilling and blasting are better. However, with calcite crystal cave, the most easy to make the deviation and khaki holes, 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. Two rock drilling work before starting, the pilot site in advance cut into 2.5 meters high, 3 meters wide and 3 meters of space, and the installation of two sets of feng shui pipe and lighting lines. In order to accurately grasp the position and direction of the hole, a wood steering wheel, which is pre-depicted with a hole array, is placed at a predetermined foot of the patio