Question

3-5 The cross-sectional dimension of a concrete retaining wall is shown in Fig 3-34, together with the soil profile of the ground. If a vertical line load (in- cluding the self weight of the wall) acting on the wall foundation is P = 1000 kN/m and its point of application is 3.83 m to the wall front toe A. The horizontal thrust on the wall back is H =350 kN/m and its point of ap- plication is 3.5m above the wall foundation. Find the vertical stress increase and the vertical effective overburden pressure at points M and N under the wall front toe A.

Answer 1

Sigma_v = q + { r_1 d_1 +r_2d_2 +r_3 (z- d_1-d_2} = F/A + { 18.5 times 3 + 20 times 1 + 19 (8-3-1)} = (1000 times 3.83 + 350 times 3.5)/ 1/2 times 2 .17 times 3.5) + 151.50 = 5055 + 151.50 = 1330.26 + 151.50 sigma_v = 1481.76 KN/m^2 effective over burner pressure sigma_m^' = sigma_v -4 == 1481.76- 20 times 1 = 1461.76 sigma_N^' = sigma_v = y = 1481.76 -0 = 1481.76