~ ______ +--_

Figure 12.17 gives the value of K s for various values of l/J1 as a function of q21q1. The variation

of calc; with q21qI is shown in Fig. 12.18. Equation (12.45) for qt and qb in Eq. (12.51) are for strip footings. These equations with

shape factors may be written as

(12.52)

(12.53)

where sc' Sq and Sy are the shape factors for the corresponding layers with subscripts 1 and 2 representing layers 1 and 2 respectively.