This code sets forth the guidelines for the design, construction, and testing of various types of pile foundations. It details the methods to calculate load-carrying capacities statically, dictates spacing and group action rules, and outlines testing procedures like initial and routine pile load tests.
Provides methods for design and construction of pile foundations, including guidance on site investigation and boring practices, often referenced for its investigation aspects.
Quick Reference Values
minimum spacing friction piles3 times pile diameter
minimum spacing end bearing piles2.5 times pile diameter
minimum spacing piles resting on rock2 times pile diameter
factor of safety static capacity2.5
maximum settlement routine test12 mm
maximum settlement initial test10% of pile diameter (for bored piles)
Key Formulas
Qu = Ap * Nc * Cp + As * α * C — Ultimate static bearing capacity in cohesive soils
Eg = Qg / (n * Q1) — Group efficiency of piles
Practical Notes
The 1979 version has been superseded by the 2010 version, which increased the minimum grade of concrete for cast-in-situ piles from M20 to M25.
Always perform a pile load test to validate the static formula calculations, as soil characteristics vary significantly.
Ensure proper execution of tremie concreting in bored cast-in-situ piles to prevent soil inclusion and necking.