A soil profile consists of 12 m of gravel overlying a clay layer of 3.5 m thickness,which in turn rests on a 4 m sand layer. The dry and saturated unit weights of thegravel are 17.5 kN/m3 and 20.5 kN/m3. Unit weights of the clay and the sand are20 kN/m3 and 19.5 kN/m3 respectively. Below the sand layer lies impermeablebedrock. If a wide excavation of 3 m depth is to be made in a relatively short time,draw the effective, total and pore pressure diagrams before and a long time afterthe excavation is made. Ground water table is 5 m below the ground surface.

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Soil borings made at a site indicate that the top 8 m is a loose sand, with the groundwater table at 4 m below the ground surface. Below this is a fairly soft blue-gray silty clay with an average water content of 30%. The boring was terminated at 20 m below the ground surface when fairly stiff silty clay was encountered. For the upper sand gammadry = 14.0 kN/m3 and gammasat = 15.0 kN/m3 , where gamma is the unit weight. For the clay, ps = 2.70 Mg/m3 where p is density. (1) Calculate the total stress, pore water pressure, and effective stress at 0 (the surface), 4, 8, 14, 16, and 20 m below the ground surface.  (2) Plot the soil profile and the variation of total stress, pore water pressure, and effective stress with depth.

Compute the cohesion of the clay. The results of a three consolidated undrained tri-axial tests on a saturated clay are as follows : a. 10.45 kPab. 12.25 kPac. 11.62 kPad. 15.62 kPa

A soil profile is shown in Figure ?-?. Compute the shear strength on the horizontal and vertical planes at points ? and ?.

Consider the soil profile shown in the figure below, and an initial groundwater depth of 5 feet below the ground surface. Assuming the soil above the water table is dry, then Ground Surface Ya = 115 Ib/ft G.= 2.65 5 ft SAND 15 ft Ysat = 120 Ib/ft3 e,- 1.1 C = 0.5 C, = 0.05 o- 2.8 ksf 15 ft CLAY ROCK a. The in-situ effective vertical stress in the middle of the clay layer is psf. b. If a uniform permanent load of 500 psf is applied on the ground surface, the estimated primary consolidation settlement of the clay layer is inches. c. If the groundwater table is lowered to the top of the clay layer at a final depth of 20 feet below the ground surface after the consolidation settlement in part (b) is completed, the effective vertical stress increase in the middle of the clay layer is psf.

For the layered soil shown in the figure, H1 = 5 m, H2 = 5 m, and H3 = 20 m. The soil densities are ρ1=2040kg/m3, ρ2=1940kg/m3, and ρ3′=1020kg/m3. What value of h' will cause quick condition at the bottom of soil 3? CHOICES A. 30.3 m B. 25.4 m C. 20.8 m D. 33.3 m

3. Refer to figure shown. Determine H. H 6 m. 4.1 m Saturated clay Ysat =17.5 kN/m³ Sand: Ysa =16 kN/m3 Figure 8.18 Layer of saturated clay underlain by layer of sand

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A)Plot graphically all the vertical stresses, pore water and effective vertical stresses throughout the depth. B)How would the effective vertical stress value at the midpoint of the clay layer change if the groundwater level increased 2 m? (g = 10 m / s2)