How to work out several types of pile foundation and selection
The pile codes comprises of the following four sections :-
1. Concrete Piles
2. Timber Piles
3. Under Reamed Piles
4. Load Test On Piles
Given below, some significant modifications in the code :-
Definitions of several terms are changed according to the current engineering practice.
Minimum grade of concrete to be applied in pile foundations is modified to M25.
Design parameters relating to adhesion factor, earth pressure coefficient, modulus of subgrade reaction etc. are modified to make them compatible with construction practices.
Minimum dia of bored cat in situ pile is revised as 450 mm.
Methods for working out the bearing strength, structural strength, factor of safety, lateral load strength, overloading etc. are also revised to make them equivalent with current practice.
Minimum time of curing prior to deal with precast piles is revised.
How to choose pile foundation
For weak bearing soil like soft clay, medium clay or any clay etc. under reamed pile foundation with pile cap and grade beam or bored cast insitu pile foundation having pile cap should be implemented.
For clay soil containing G+2F, G+3F, slit+3floors loads, under reamed piles having pile caps should be implemented. This type of foundation is ideal for multi-storied building.
When the enforced on foundation is 500KN (G+2Floor load), under reamed pile foundation for a depth of 3.5m to 4.50m having pile caps should be implemented.
When the load on foundation remains in the range of 2000KN to 3000KN, bored cast in-situ concrete piles with 6.0m to 20.0m depth having pile caps should be implemented.