In typical deposit of submerged soil, the approximate depth at which the inter-granular pressure is equal to 60 kN/m² is: (Ysat = 30 kN/m³
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In typical deposit of submerged soil, the approximate depth at which the inter-granular pressure is equal to 60 kN/m² is: (Ysat = 30 kN/m³)
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- 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 Gravel1. A soil deposit is shown in the figure below. The ground water table, initially at the ground surface, was lowered to a depth 25ft below the ground. After such lowering, the degree of saturation of the sand above water table was lowered to 20%. Water table Ground surface Ysat = 135 pcf Ya = 116 pcf Sand 50 ft 25 ft Clay Ysat = 120 pcf a) What is the vertical effective pressure at the midheight of the clay layer before lowering of the water table, in psf. b) What is the vertical effective pressure at the midheight of the clay layer after lowering of the water table, in psf. c) What is the vertical effective pressure when there is no water in the sand layer, in psf.7.10 The hydraulic conductivity of a sand at a void ratio of 0.5 is 0.022 cm/sec. Estimate its hydraulic conductivity at a void ratio of 0.7. Use Eq. (7.31). 7.18 A layered soil is shown in Figure 7.31. Estimate the ratio of equivalent hydraulic conductivity, kmeq/kvieg)- 1.5 m 1 m 1.5 m |k = 2 × 10-³ em/sec (top layer) | k = 2 × 10-4 cm/sec | k = 10-4 cm/sec | k = 3 × 10-4 cm/sec (bottom layer) Figure 7.31 -
- In a pressuremeter test in a soft saturated clay, the mea- suring cell volume V, = 535 cm³, Po = 42.4 kN/m², P; = 326.5 kN/m², v, = 46 cm³, and v, = 180 cm³. Assuming Poisson's ratio (µ,) to be 0.5 and using Figure 3.31, calculate the pressuremeter modulus (E„).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 total stress at point C in KPa. h=0.45m T H₁-0.60 m H₂-0.90 m Direction of flow H₂O Sand 1265 valve openA 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
- A soil deposit is shown in Figure 1.1. Ground surface Groundwater Table e=0.52 42.1 ft Gs=2.61 Layer 1 e=0.86 26.1 ft Layer 2 Gs=2.71 Sand Clay Rock The shallow groundwater table is initially at the ground surface, was lowered to a depth of 31.2 ft below the ground. After such lowering, the sand above water table is dry. - What is the vertical effective pressure at the mid-height of the clay layer before lowering of the water table, in psf? - What is the vertical effective pressure at the mid-height of the clay layer after lowering of the water table, in psf?A sand layer has e = 0.7 and G = 2.7. Determine the hydraulic gradient at which point boiling is experienced.A 39.4 ft thick layer of relatively impervious saturated clay lies over a gravel aquifer. Piezometer tubes introduced to the gravel layer show an artesian pressure condition with the water level standing in the tubes 9.8 ft above the top surface of the clay stratum. The properties of the clay are e = 1.2, G, = 2.7 and Ysat = 110.62lb/ft³ Determine (a) the effective stress at the top of the gravel stratum layer, and (b) the depth of excavation that can be made in the clay stratum without bottom heave. TIRSURS 39.4 ft Clay Gravel II TIRSURS TIRSURS Figure Ex. 5.12 49.2 ft TIRSURS
- Given the following: H1 = 1.5 m H2 = 3.0 m H3 = 2.0 m K1 = 0.001 cm/sec K2 = 0.032 cm/sec K3 = 0.000041 cm/sec 1. Find the effective average permeability of the deposit in the horizontal direction. (in cm/s) 2. Find the effective average permeability of the deposit in the vertical direction. (in cm/s) 3. What is the ratio of the equivalent hydraulic conductivity?Water flows in the upward direction in a tank through 2.5 m thick sand layer as shown in the figure. The void ratio and specific gravity of sand are 0.58 and 2.7, respectively. The sand is fully saturated. Unit weight of water is 10 kN/m³. Outward flow 1.2 m 1m water Sand 2.5m •A 1m Filter media Inward flow > The effective stress (in kPa, round off to two decimal places) at point A, located 1 m above the base of tank, is aliceThe soil profile consists of 5m sand underlain by 13 m layer of clay. The ground water table is at a depth 2.8 m below the surface. The sand has a unit weight of 19 kN per cu. Meter above the ground water table and the saturated unit weight below was 20 kN per cu. meter. The saturated unit weight of the clay is 15.7 kN per cu. meter. At a depth of 11 m determine the following:a. Total stressb. Pore water pressurec. Effective stress.....