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UPSC Civil Service Exam Questions - Engineering

Q1:

Ratio of bearing capacity of double Under Reamed (U.R.) pile to that of single U.R. pile is nearly

A 2

B 1.5

C 1.2

D 1.7

ANS:B - 1.5

According to IS 2911 : Part III 1973, the ratio of bearing resistance for double under- reamed pile to that of single under-reamed pile is 1.5 for sandy and clayey soils including black cotton soils.