ABSTRACT
Chart for Estimating Allowable Soil Pressure Fig. 13.5 gives a chart for estimating allowable bearing pressure qs (on settlement consideration) corresponding to a settlement of 16 mm for different values of N (corrected). From Eq. (13.6) , an expression for qs may be written as (for normally consolidated sand)
N 1.4 where Q = cor
For sand having a preconsolidation pressure Pc' Eq. (13.7) may be written as
for qs > Pc qs =16Q +O.67pc
(13.12a)
(13,12b)
(13.13a)
(13.13b) If the sand beneath the base of the footing is preconsolidated because excavation has removed
a vertical effective stress q'0' Eq. (13.8) may be written as
(13.14a)
(13.14b)
Figure 13.5 Chart for estimating allowable soil pressure for footing on sand on the basis of results of standard penetration test. (Terzaghi, et aI., 1996)
