Question

Due to continuous rainfall the clay has turned saturated. (a) Check the short term stability of the wall against forward sliding. (b) Check the long term stability of the wall against forward sliding. Assume reasonable water pore pressure distribution. Assume the soil shear strength in the passive zone is mobilized by 50%. 2 m Saturated clay: y = 20 kN/m y=24 kN/m3 Cu = 40 kPa, Cw = 40 kPa 10 m % = 30º = 22.5 1 m Drain below any possible failure plane 5.0 m

Answer 1

solution h-iom r = 24 kN/m (soil) Y = 20 kN/m3 up = 30°. D =22.5 De Loodu, Wy magnitude O2 Xloxesx) = 50 kn s 80.25 x 10X IX 2q = 31.25 IN Back fill = 2.000 X 1920 = 400 IN. Total = 481.25 IN. Earth pressure = PH = 0.33 3820 X 48 x 180 =100.8 KN-M moment at w = 50x5 = 83.33 KNM 80.6 W- - 3175x9.5+ Stability checks check for FOS - over turning. EMR. 168.9 Mo 100,8 -1.67 (in 1672 155) It is safe.

check for sliding. FOS – MEW PH e =0,6 from calculation M=sliding factor Ewa road PH – Earth pressure - 0.6 X 481.25 100.8 = 52.86 21:55 is sale against s. The structure sliding. check for subsidence | x 4 = \ 3. EW Due to the soil is saturated the wall just moves slightly. But it is safe againt stable. forward slicing in the structure is