Pile load test IS 2911

In this type of test, compression load is applied to the pile top by means of a hydraulic jack against rolled steel joist or suitable load frame capable of providing reaction and the settlement is recorded by suitably positioned dial gauges.The pile head should be chipped off to natural horizontal plane till sound concrete is met. The projecting reinforcement should be cut off or bent suitably and the top finished smooth and level with plaster of Paris or similar synthetic material where required. A bearing plate with a hole at the centre should be placed on the head of the pile for the jacks to rest.The test should be carried out by applying series of vertical downward incremental load each increment being of about 20 percent of safe load on the pile.

The safe load on single pile for the initial test should be least of the following:
Two thirds of the final load at which the total displacement attains a value of 12 mm unless otherwise required in a given case on the basis of nature and type of structure in which case,
the safe load should be corresponding to the stated total displacement permissible.
50 percent of the final load at which the total  displacement equal 10 percent of the pile diameter in case of uniform diameter piles and 7.5 percent of bulb diameter in case of under-reamed piles.
INITIAL load tests
2 times load to the designed bearing capacity.
min 2 nos of piles
ROUTINE load tests
1.5 times load to the designed bearing capacity.
min 2 no of piles max to 2% of piles

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