The stability of drilling chamber is an important facet to ensure the safe operation of VCR mining method.
凿岩峒室的稳定性是VCR采矿法安全的重要保障。
VCR mining method significantly improves the mining safety as no person is required to operate directly under the unsupported roof.
VCR法免除了人员在顶板下作业，大大提高了采矿的安全性。
By employing the VCR mining method, the experiment of blasting funnel must be carried out on the spot in order to ensure the parameters in mining by globular dynamite charge.
使用VCR采矿法进行采矿时，必须就地进行爆破漏斗实验，以确定利用球状药包落矿时的爆破参数。
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