In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed A. 10 mm B. 15 mm C. 20 mm D. 25 mm

[amp_mcq option1=”10 mm” option2=”15 mm” option3=”20 mm” option4=”25 mm” correct=”option1″]

The correct answer is A. 10 mm.

The net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed 10 mm for a safe pile. This is because a pile that settles more than 10 mm per tonne of test load is likely to be unstable and could fail under load.

Option B is incorrect because 15 mm is too much settlement for a safe pile. Option C is incorrect because 20 mm is too much settlement for a safe pile. Option D is incorrect because 25 mm is too much settlement for a safe pile.