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Which of the following drilling method is unsuitable in loose formations such as unconsolidated sand and gravel or quicksand?

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+1 vote
in Irrigation Engineering by (75.2k points)
Which of the following drilling method is unsuitable in loose formations such as unconsolidated sand and gravel or quicksand?

(a) Percussion drilling

(b) Wash boring method

(c) Rotary boring method

(d) Reverse rotary method

The question was posed to me by my school teacher while I was bunking the class.

Origin of the question is Tube Well-1 in division Ground Water for Irrigation through Wells and Tubewells of Irrigation Engineering

1 Answer

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by (106k points)
The correct answer is (a) Percussion drilling

Easy explanation: Percussion method of drilling the well hole is also known as the cable method of drilling. It is ineffective in loose material because of slumping and caving of the material around the drilling bit. This method is useful for cutting consolidated rocks from soft clay to hardest rocks.

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