Boreholes reveal that a thin layer of alluvial silt exists at a depth of 50 ft below the surface of the ground. The soil above this level has an average dry unit weight of 96 lb/ft3 and an average water content of 30%. The water table is approximately at the surface. Tests on undisturbed samples give the following data: cu = 1008 lb/ft2, undrained friction angle = 13°, cd = 861 lb/ft2, drained friction angle = 23°. Estimate the shearing resistance in psf of the silt on a horizontal plane when the shear stress builds up rapidly. with fbd a.2185 b.2449 c.861 d.3120

2. A sensitive volcanic clay soil was tested in the laboratory and found to have the following properties: . p=1.28 Mg/m³ e = 9.0 S = 95% Ps= 2.75 Mg/m³ W = 311% In rechecking the above values, one was found to be inconsistent with the rest. Find the inconsistent value and report it correctly. Show all your computations and phase diagrams.

The soil profile at a site consists of a top 4 m layer of dense sand followed by 2 m of clay, which is underlain by a stiff stratum. The water table is at 2 m below the ground level. The following data was obtained from a consolidation test on an undisturbed sample obtained from the middle of the clay layer: water content = 36%, specific gravity of the clay grains = 2.72, compression index = 0.72, recompression index = 0.07, pre-consolidation pressure = 85 kPa. The bulk and saturated unit weights of the sand are 17 kN/m3 and 18.5 kN/m3 respectively. The ground level was raised by placing 2 m of compacted fill with a unit weight of 20 kN/m3. Estimate the final consolidation settlement. It is proposed to construct a warehouse covering a large area on top of the raised ground, which is expected to impose a pressure of25 kPa. What would be the additional consolidation settlement?

4. A soil sample has a bulk unit weight of 19.6 kN/m³ and a water content of 10%. The value of Gs (i.e. the specific gravity of soil grains) is 2.70. Calculate the void ratio and degree of saturation of this sample. What would be the values of unit weight and water content if the soil were fully saturated at the same void ratio?

1. A specimen of sandy silt, when subjected to a drained triaxial test failed at major and minor principal stress of 1.20 kg/cm2 and 0.5 kg/cm2 respectively. At what value of deviator stress would another sample of the same soil fail, if it were subjected to an all-around pressure of 0.75 kg/cm2? a. 2.01 kg/cm2 b.2.34 kg/cm2 c. 1.89 kg/cm2 d. 1.05 kg/cm2