HOMEWORK SOLUTION

HW #2

CE 455

FOUNDATION AND EARTH STRUCTURE

(Question no. 2.3, 2.5, 2.14, & 2.20 ..Braja M. Das textbook)

2.3 N_F = 6, K = 4.2 kN/m²

Unconfined compression strength (q_u) = 2*c_u=2*KN_F = 2*4.2*6 = 50.4 kN/m²

2.5 f = 27.1+0.3N_cor-0.00054N_cor²

N_cor = C_NN_F

According to Liao and Whitman C_N =

2.14 g_d = 15.5 kN/m³

Estimate the average peak friction angle (f) and average relative density (Dr)

Use eq. 2.26

And figure 2.32 for average relative density (Dr)

2.20 Velocity of P-wave (v) = 1900 m/sec, u = 0.32, g = 18 kN/m³

The modulus of elasticity of the soil

…………eq. 2.48