我队正在政棠和铜山两矿区施工。铜山矿区平均换层率为130层/百米,岩石大部为中、细粉砂岩、砾岩和泥岩。其中硅质砂岩和砾岩的可钻性达Ⅷ级,部分松散地层很难形成规则孔壁。矿区断层多,漏水、涌水现象时有发生。政棠矿区岩石多为中、细粉砂岩、角砾岩等,有些石英成分占50％以上,可钻性达Ⅶ—Ⅷ级。矿区平均换层率170 Our team is under construction in Tongliang and Tongshan two mines. Tongshan mine area average exchange rate of 130 layers / 100 meters, most of the rock for the medium and fine siltstone, conglomerate and mudstone. Among them, the drillability of siliceous sandstone and conglomerate reaches Ⅷ level, and the formation of regular pore walls is difficult to form in some loose strata. There are many faults in the mining area, water leaks and gushing water occur frequently. Most of the rocks in Zhengtang mining area are medium and fine siltstone, breccia, etc. Some quartz accounts for more than 50% of the total and the drillability reaches Ⅶ-Ⅷ. Mining area average exchange rate of 170