soft-broken rock 软破岩
broken soft rock 破碎软岩
Soft and broken surrounding rock 松软破碎围岩
Soft and broken mine rock 软弱破碎
broken and soft rock 破碎软岩
This paper introduces the application about anchor cable jetting combined supporting in broken soft rock drift.
重点介绍了锚索喷注联合支护在碎胀软岩巷道掘进中的应用。
The article analysed national situation of bolt shotcrete and wire in soft rock, based on theory of broken-rock circle, concluded the relation of broken-rock circle and soft support.
本文分析了软岩巷道支护研究的国内外现状，以围岩松动圈理论研究为基础，得出围岩松动圈与软岩巷道支护的关系。
For soft rock, the hard rock, hard rock and other strata, multi-point drill bit broken efficient.
适用于轻型回转钻机钻进软岩、中硬岩、硬岩等各类地层，钻头采用多点破碎，效率较高。
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