Hose bit can be divided into cutter teeth and cone teeth, cone teeth for weathering of soft rock strata, and permafrost, cutter teeth used for drilling hard bedrock.
筒式钻头的切削具可分为截齿和牙轮，截齿筒状钻头用于风化软岩及永冻土地层钻进，牙轮筒式钻头用于硬质基岩钻进。
This paper is focused on the studying of excavation slope stability of Xigeda strata, a typical model of dead soft rock.
本文重点对极软岩中的典型代表昔格达地层路堑边坡稳定性进行研究。
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。
The vital problems to be solved in Shendong mine are the dynamic pressure damage of thin rock strata roof under thick sandy soil soft stratum and the loss of water and soil under mining.
浅埋煤层薄基岩厚砂土松散层顶板动压灾害和采动水土流失是神东矿区急需解决的重大问题之一。
The vital problems to be solved in Shendong mine are the dynamic pressure damage of thin rock strata roof under thick sandy soil soft stratum and the loss of water and soil under mining.
浅埋煤层薄基岩厚砂土松散层顶板动压灾害和采动水土流失是神东矿区急需解决的重大问题之一。
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