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。
The Tertiary strata belong to soft rock.
第三系岩层属中软岩。
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。
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