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Identify the given pile driving formula. (a)Merriman formula

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Identify the given pile driving formula.

(a) Merriman formula

(b) Ritter formula

(c) Vulcan Iron Works formula

(d) Kreutzer formula

I got this question in an international level competition.

My question is taken from Pile Driving Formulas topic in section Deep Excavations, Pile Foundations and Caisson of Construction & Building Materials

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Correct answer is (b) Ritter formula

For explanation: Above given formula is Ritter formula. It is an important pile driving dynamic formula. Where, R = ultimate load carrying capacity of pile in kg.

H = height of free fall of ram in case of drop hammer in cm.

S = final settlement of pile in cm.

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