When drilling deep holes, the feed movement should be released from time to time. 在鉆深孔的時(shí)候,有時(shí)必須放松進(jìn)給運動(dòng)。
The new method adopted roof presupporting,deep and medium hole blasting,LHD ore removal and tailings filling. 該采礦方法采用采場(chǎng)預控頂技術(shù),中深孔爆破,鏟運機出礦,尾砂充填。