The speed of soil delivering and resistance of auger drill are analyzed theoretically and their formulae are presented.

对螺旋钻具输土速度与阻力进行理论分析，给出了输土速度公式和阻力公式。

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Combined with engineering example the characteristics of auger drill and construction defects for special strata are discussed.

结合工程实例，论证了旋挖钻机的特点及在特殊地层的施工缺陷。

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Based on the machine development, a research and analyses of auger drill bits with different kinds of drill tips and soil cut blade angles were carried out in tree planting field.

在设备研制成功的基础上，对钻孔机钻头不同钻尖、不同切土刀刃角进行了实地试验研究和分析。

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The Rail Accident Investigation Branch (RAIB) said the broken sections were part of an auger drill that had "penetrated the tunnel lining before falling on to the track".

BBC: Construction drill came from site above rail tunnel