A 13 m thickness of saturated sand with saturated unit weight of 19.25 kN/m3. Determine the pore water pressure at the bottom of this saturated sand layer
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- 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 openEFFECTIVE STRESS CONCEPT SITUATION 1: A saturated clay 15 m thick has a void ratio of 0.6 anda specific gravity of 2.7. 5. Which of the following gives the saturated unit weight of clay? a. 18.95 kN/m? C. 20.23 kN/m? b. 19.18 kN/m? d. 24.22 kN/m? 6. Which of the following gives the total vertical stress at the bottom? a. 303.45 kPa C. 355.66 kPa b. 295.66 kPa d. 145.67 kPa 7. Which of the following gives the effective vertical stress at the bottom? a. 197.33 kPa c. 177.21 kPa b. 187.95 kPa d. 156.34 kPaA 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
- A soil profile shown has a zone of capillary rise in the sand overlying the clay. In average degree of saturation is 60% with a moist unit weight of this zone, the 17.6 kN/cu.m. a. Compute the effective stress inside the capillary zone at a depth of 3.0 m below the ground surface. Ground surface Dry Sand Ydry=16.50 kN/m³ 3m 3.9 m b. Compute the effective stress at a depth of 3.9 m below the ground. 6.9 m Sand B 0.9 m Y=17.6 kN/m Z water table Clay С. Compute the effective stress at C. Yrar=18,08 kN/m' 3mWhat is the intensity of active earth pressure at a depth of 10.0 m in dry sand with an angle of shearing resistance of 30 degrees and unit weight of 18kN /m ^ 3 ?The 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.....
- 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?Effective and Neutral Stress Question 2: The saturated unit weight of sand in the bed of a pond 20 m deep is 20 kN/m³. Unit weight of water is 10 kN/m³. The effective stress at 4 m below bed level of pond isFrom the figure shown, H1 = 0.60, H2 = 0.90 m. and h = 0.45 m. The sad 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 following: 1. Total stress and Effective stress at C. 2. Pore water pressure at C. 3. Rate of upward seepage of water in liters/sec.
- 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 GravelIn a typical deposit of submerged soil, the approximate depth at which the inter-granular pressure is equal to 50 kN/m² is: (Ysat = 20 kN/m³) orProblem 1 A ground profile consists of 2 m of silty sand underlain by 3 m of clay. The ground water table is 3 m below the ground surface. The sand has a unit weight of 14 kN/m3. The clay has unit weight of 16 kN/m3 above the water table and 20 kN/m3 below the water table. a. Determine the total stress at bottom of the clay b. Determine the pore water pressure at the bottom of the clay c. Determine the effective stress at the bottom of the clay Problem 2 50 ft thick sand is underlain by 25 ft clay. The ground water table, initially at the ground surface, was lowered to a depth of 25 ft below the ground. After such lowering, the degree of saturation of the sand above water table was lowered to 20%. Saturated and dry unit weight of sand are 135 pcf and 116 pcf respectively. The saturated unit weight of clay is 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…