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In rotator boring __________ is forced down the hallow drillrods.

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+1 vote
in Geotechnical Engineering II by (93.8k points)
In rotator boring __________ is forced down the hallow drillrods.

(a) glycerine

(b) water solution of bentonite

(c) dextrin

(d) phenyl

I had been asked this question during an online interview.

I need to ask this question from Soil Samples and Samplers topic in division Stabilisation of Soils, Site Investigation and Sub – Soil Exploration of Geotechnical Engineering II

1 Answer

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by (243k points)
Correct option is (b) water solution of bentonite

To explain: In rotator boring, a drilling mud, usually a water solution of bentonite with or without other admixtures is continuously forced down the hollow drilling rods. The mud returning upwards bring the cuttings to the surface.

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