Estimate the lateral earth pressure developed at a depth 5 m below the soil surface of a loose sand deposit (wet unit weight of soil is 17.5 kN/m3). Also estimate the lateral pressure for the same depth if the sand is in a dense condition (unit weight is 20.5 kN/m3). What would be the total lateral pressure for the loose sand condition described if the water table were at the ground surface?

A soil exists in an area where the ground surface is level and the groundwater table is 3 m below the surface. The saturated unit weight for the soil is 22 kN/m3, and the wet weight for the soil above the water table is 18 kN/m3. The lateral pressure is 0.5 times the vertical pressure. The vertical and lateral pressures represent principal stresses. Determine the value for the major and minor principal stresses at a depth of 10 m (determine values for both the total stress and effective stress condition), and the maximum shear stress that develops because of the effective principal stresses.

Show full solutions. a) 60 kPa b) 144.8 kPa

A 15 m deep sand layer has its groundwater table level at 5 m below the ground level. If the saturated and dry densities of sand are 19.5 and 16.5 kN/cum, then the effective pressure (kN/sq.m.) just above the groundwater table would be?

1. (30 pts) The soil profile shown below consists of 10 meters of sandy silt overlying gravel. The pore water pressure at the top surface of the silty sand is zero and can be assumed to remain zero. a) Calculate the level to which water would rise in a piezometer tube inserted into the top of the gravel if the silty sand is just stable? Use submerged unit weights and seepage forces to arrive at your answer (do not calculate total stresses and pore water pressures). Express your answer as an elevation, e.g. "Elev. 130". (Note: Elevations are in meters) (10 pts) b) Using the piezometric elevation calculated in part (a), calculate the pore water pressure at the bottom of the silty sand if the silty sand is just stable (10 pts). c) Calculate the total stress at the base of the silty sand and show that it is equal to the pore water pressure calculated in part (b) (10 pts) Elev. 120 m. Elev. 110 m. Sandy Silt (saturated) Void ratio, e = 0.68 G = 2.65 Gravel

A dense silt layer has the following properties: void ratio = 0.75, specific gravity = 2.59. Free ground water is 9.49 m. below the ground. Capillary action rise will reach 6.69 meters. The soil above capilary action rise is dry while within the zone, it is saturated at 50.02%. Determine the effective pressure (in kPa) at a depth of 7.51 meters from the ground surface. Round off to three decimal places. Selected Answer:  128.657

A dense silt layer has the following properties: void ratio = 0.6, specific gravity = 2.55. Free ground water is 9.85 m. below the ground. Capillary action rise will reach 7.94 meters. The soil above capilary action rise is dry while within the zone, it is saturated at 54.63%. Determine the effective pressure (in kPa) at a depth of 7.05 meters from the ground surface. Round off to three decimal places.

The subsoil strata at a site consist of fine sand 3.0 m thick overlying a stratum of clay 2.8 m thick. Under the clay stratum lies a deposit of coarse sand extending to a considerable depth. The water table is 2.8 m below the ground surface. Assuming the top fine sand to be saturated by capillary water, calculate the effective pressures at ground surface and at depths of 3.0 m, 5.8 m and 8.0 m below the ground surface. Assume for fine sand G = 2.65, e = 0.83 and for coarse sand G = 2.79, e = 0.53. What will be the change in effective pressure at depth 3.74 m, if no capillary water is assumed to be present in the fine sand and its bulk unit weight is assumed to be 16.88 kN/m3 . The unit weight of clay may be assumed as 19.75 kN/m3. Comment on the effect of the present of groundwater on design of earth structures?

A dense silt layer has the following properties: void ratio = 0.77, specific gravity = 2.51. Free ground water is 10.37 m. below the ground. Capillary action rise will reach 5.6 meters. The soil above capilary action rise is dry while within the zone, it is saturated at 53.53%. Determine the effective pressure (in kPa) at a depth of 7.72 meters from the ground surface. Round off to three decimal places. Selected Answer: ® 140.131 Correct Answer: 128.051 + 1

): A 12 m depth of sand layer has a dry unit weight of 18 kN/m³ and submerged unit weight of 11 kN/m' overlies a 7 m layer of normally consolidated clay below which is an impermeable stratum. The properties of clay layer are (Gs= 2.76, w-40.5%, L.L= 48%, c,= 1x10² cm²/sec). The water table was 5 m below natural ground surface. The average increase in pressure at the center of the clay layer is 120 kN/m² due to the weight of a building that constructed on ground surface. Determine: 1- The expected total primary consolidation settlement. 2- Time required for ultimate consolidation settlement. 3- Excess p.w.p at point located 1.75 m below the surface of clay layer after 6 months of applying loading. was=se. 4- Permeability of clay layer