In an initial (routine) pile load test as per IS 2911 Part 4, the safe load on a single pile is taken as the lesser of:
Choose the correct answer
The failure load and the load at 25 mm settlement
Two-thirds of the final load at which the total settlement exceeds 12 mm, and half the load at which the total settlement equals 10% of the pile diameter
The test load divided by 3 (FOS = 3 always)
The load at which the rate of settlement stabilises
Correct Answer
B. Two-thirds of the final load at which the total settlement exceeds 12 mm, and half the load at which the total settlement equals 10% of the pile diameter
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IS 2911 Part 4: Safe load = lesser of: (a) 2/3 of final load causing total settlement = 12 mm (or 10% of pile diameter, whichever is less) and (b) 50% of final load causing total settlement equal to 10% of pile diameter. Alternatively, FOS = 2.5 on ultimate load from load-settlement curve. Maintain each load increment for 24 h.
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