This code specifies the methodology for conducting initial and routine load tests on pile foundations. It establishes standardized procedures for vertical compression, lateral, and pull-out tests to accurately determine the safe working capacity and settlement behavior of piles in the field.
Prescribes methods for conducting load tests on piles to determine their bearing capacity and settlement characteristics.
Quick Reference Values
routine test load limit1.5 times the estimated safe load
initial test load limit2.5 times the estimated safe load or up to failure
deflection limit lateral load5 mm total deflection at cut-off level
dial gauge least count0.01 mm
distance to kentledge supportsMinimum 1.5 m from test pile
distance to reaction pilesMinimum 3 times pile diameter or 2.5 m (whichever is greater)
Key Formulas
Safe Vertical Load = Least of: (a) 2/3rd of the final load at which total settlement is 12 mm, or (b) 50% of the final load at which total settlement is 10% of pile diameter
Practical Notes
Ensure the kentledge or reaction frame is perfectly stable and concentric with the test pile to avoid eccentric loading and erroneous settlement readings.
Datum bars used for mounting dial gauges must be rigidly supported outside the zone of influence of the test and reaction piles to prevent ground heave interference.
Routine tests must be conducted on working piles that will actually be used in the final structure, without causing structural damage.