Refer to Figure 9.23. For a foundation on a layer of sand, given: B = 1.52 m, L = 3.05 m, d = 1.52 m, β = 26.6°, e = 0.152 m, and δ = 10°. The pressuremeter testing at the site produced a mean pressuremeter curve for which the p_p(m) versus ΔR/Ro points are as follows.

DR/R_o (1) ……………………………… p_p(m) (kN/m²) (2)

0.002 ………………………………………….… 49.68

0.004 ………………………………………….… 166.68

0.008 ………………………………………….… 244.94

0.012 ………………………………………….… 292.56

0.024 ………………………………………….… 475.41

0.05 …………………………………………..… 870.09

0.08 ………………………………………….… 1225.79

0.1 ……………………………………………… 1452.45

0.2 ……………………………………………… 2550.24

What should be the magnitude of Q_o for a settlement (center) of 25 mm?