Q3: Refer to the soil profile shown in the figure below: a) Calculate the variation in vertical stress, pore water pressure, and effective stress at points (A, D, B, and C) b) What is the change in the effective stress at the bottom of the clay layer if the water rises (1m) above the water table in the figure? c) How many meters must the water table rise (from the profile below) to decrease the effective stress by 10% at the bottom of the clay layer?

Plot the stress profile for total stress, effective stress and pore water pressure. Show all calculation A Diy sand 0,61 2.66 41 Salurated sand, =0.48° 2.67 Clay

1. Given the figure below plot the pore pressure, total stress and effective stress at the top, bottom and midpoint of each soil layer, provide a plot with all umerical values of depth and stress in tabular form and on a depth v stress plot. Oft Sand Vmoist = 122 pcf Ysat = 151 pcf I 12ft 30ft Clay Ysat = 144 pcf %3D 70ft Sand Ysat = 128 pcf 120ft

5-4 For the given soil profile and the piezometric surfaces measured at the top of the two sand and gravel layers, determine the pore pressure and effective stress at points A, B, C, D, and E. Piezometers 2 m Ground surface 2 m Sand y = 18 kN/m3 Water table y_ 11m Y = 20 kN/m3 A 4 m Clay Y = 18 kN/m3 加。B 1Im 5 m Sand and gravel y = 22 kN/m3 2 m •D 5 m Clay Y = 19 kN/m3 Sand and gravel y = 23 kN/m3 %3D Cpyright by