Geotechnical Engineering

DHARM

678 GEOTECHNICAL ENGINEERING

R.C. column

Column pedestal

Reinforcing steel

Pile cap

Pile

Fig. 16.13 Pile cap for a R.C. column
The spacing of piles in a group depends upon a number of factors such as the overlap-
ping of stresses of adjacent piles, cost of foundation and the desired efficiency of the pile group.

Pile

Isobar Isobar

(c) Widely spaced group of piles

(without zones of stress overlap)

Stress isobars

(a) Signal pile

Pile

Pile cap

Pile

Stress isobar

for single pile zone of overlap(highly-stressed)

Stress isobar of

group of piles

(b) Closely spaced group of piles

(with zones of stress overlap)

Fig. 16.14 Stress isobars of single pile and groups of piles