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 is?
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- A sand has Gs = 2.66. Calculate the hydraulic gradient that will cause boiling for e = 0.35, 0.45, 0.55, 0.7, and 0.8.Consider point P. If the groundwater drops 1m to the top of the clay layer, what would the change in Total Stress and Pore Water Pressure change? 1 m 1m 2m 2m P Sand Clay Sand Pd = 1.35 Mg/m³ Psat 1.85 Mg/m³ H Psat = 2.0 Mg/m³ Psat = 1.9 Mg/m³For a sandy soil, the following are given: • Maximum void ratio = 0.72 • Minimum void ratio = 0.46 • Hydraulic conductivity at a relative density of 80% = 0.006 cm/sec. Determine the hydraulic conductivity of the sand at a relative density of 67%.
- A sand deposit contains three distinct horizontal layers of equal thickness. The hydraulic conductivity of the upper and lower layers is 10-3 cm/sec and that of the middle is 10-2 cm/sec. What are the equivalent values of the horizontal and vertical hydraulic conductivities of the three layers, and what is their ratio?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 GravelA stratified soil has the following properties: h1 = 1.75m h2 = 2.5m h3 = 4.35m k1 = 2.25E-03 cm/sec k2 = 3.15E-04 cm/sec k3 = 4.75E-05 cm/sec What is the ratio of equivalent hydraulic conductivity?
- The water table in a certain area is at a depth of 4 m below the ground surface. To a depth of 12 m, the soil consists of very fine sand having an average voids ratio of 0.7. Above the water table the sand has an average degree of saturation of 50%. Calculate the effective pressure on a horizontal plane at a depth 10 metres below the ground surface. What will be the increase in the effective pressure if the soil gets saturated by capillarity upto a height of 1 m above the water table? Assume G = 2.65.A sand with Gs= 2.66 and void ratio e=0.60 is completely dry. It been becomes wetted by a rising groundwater table. Compute the unit weight in KN/cu.m. under the following conditions:a) When the sand is completely dryb) When the sand is 40% saturatedc) When the sand is completely saturatedSolve the following problems. Provide complete solutions and summary of answers. A 4-meter-thick sand overlies a thick layer of clay. The water table is 1.80 meters below the sand surface. The sand has a porosity of 34.64% and a degree of saturation is limited to 36.0% above the water table. The clay has a moisture content of 45.0% and the specific gravity of both sand and clay is 2.68. a. Total Stress at a point 12.0 meters below the sand surface. b. Total Effective Stress at a point 12.0 meters below the sand surface.
- From the figure shown, H₁ = 0.60, H₂ = 0.90 m. and h = 0.45 m. The sand has a saturated unit weight of 18.65 KN/m³. Hydraulic conductivity of sand K= 0.12 cm/sec. If the cross sectional area of tank = 0.46 m², determine the rate of upward seepage of water in liters /sec. h=0.45m T H₂=0.60 m H₂-0.90 m Direction of flow H₂O Sand ILGS G valve openA sand with Gs = 2.66 and a void ratio of 0.60 is completely dry. It the becomes wetted by a rising groundwater table. Compute the unit weight in KN/m3 under the following conditions; a) When the sand is completely dry b) When the sand is 40% saturated c) When the sand is completely saturatedA glass container with pervious bottom containing fine sand in loose state (void ratio = 0.8) is subjected to hydrostatic pressure from underneath until quick condition occurs in the sand. If the specific gravity of sand particles = 2.65, area of cross-section of sand sample= 10 cm2 and height of sample = 10 cm, compute the seepage force in N acting from below. a. 9.17. b. 0.9 c. 0.45 d 7.29