Determine: (a) the capillary height h. of the rise of the moisture into the sand stratum above the water table, and (b) determine the resulting negative porewater pressure u. ine sand d-0.30 mm G-2.66, e= 0.55, S-50% -heja WT zone of capillary rise he pere pressure saturated clay G-271 w-45% thet
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- A clay layer 12ft thick rests beneath a deposit of submerged sand 26ft thick. The top of the sand is located 10ft below the surface of a lake. The saturated unit weight of the sand is 125 lb /ft³ and of the clay layer is 117 lb /ft³. 1. Compute the total vertical pressure at the mid height of the clay layer. a. 4390psf b. 4577 psf c. 4963psf d. 4800psf 2. Compute the pore water pressure at the mid height of the clay a. 2659psf b.2620 psf c. 2668 psf d. 2680psf 3. Compute the effective vertical pressure at the mid height of the clay a. 1731psf b.1956 psf c. 2295psf d. 1273psfA dense silt layer has the following properties: e =0.406 D10= 10.1 um Capillary constant = 0.209 sq.cm Free ground water level is 8m below the ground surface. 1.) Find the height of capillary rise in the siltin meters. 2) Find the vertical effective stress at 6m depth. Assume ys = 26.51 kn/m3 and the soil above capillary action rise and ground surface is partially saturated at 79%.A dense silt layer has the following properties.void ratio = 0.30eff. Diameter ?10 = 10??capillary constant (c)=0.20 cm²Groundwater level is 8.0m below the ground surface 1. Calculate the height of capillary rise in the silt. 2. Calculate the vertical effective stress in kpa at 5m depth, assume ?? = 26.5 ??/?³and that the soil above the capillary action rise and ground surface is partially saturated at 50%. 3. Calculate the effective vertical stress at 10m depth assuming ?? = 26.5 ??/?³and that the soil above the capillary action rise and ground surface is partially saturated at 50%.
- A dense silt layer has the following properties: Void ratio = 0.76, SG= 2.59. Free ground water is 9.31m below the ground. Capillary action rise will reach 7.93m. The soil above capillary action rise is dry while within the zone, it is saturated at 53.13%. Determine the effective pressure (kPa) at a depth of 7.05m from the groind surface. Use stored value. Asnwer in 5 decimal places.A clay layer 3.66 m thick rests beneath a deposit of submerged sand of 7.92 m thick. The top of the sand is located 3.05 m below the surface of a lake. The saturated unit weight of the sand is 19.62 kN/m3 and of the clay is 18.36 kN/m3. Compute (a) the total pressure (b) the pore water pressure and (c) the effective pressure all at the mid height of the clay layer. Draw the figureA uniform soil deposit has a void ratio 0.6 and specific gravity of 2.65. The natural ground water is at 2.5 m below natural ground level. Due to capillary moisture, the average degree of saturation above ground water table is 50%. Determine effective pressure in kPa at a depth of 6 m. a. 46.40 b. 323.9 c. 80.66 d. 117.9
- A layer of sand, 4m thick, overlies a layer of low permeability clay, 5mthick. The bulk unit weight of the sand is 16.5 kN/m3 and its saturatedunit weight is 18 kN/m3 . The saturated unit weight of the clay is 21kN/m3 . The water table exists initially at 1.0m below ground level butpumping will permanently and rapidly lower the water table to 3.0mbelow ground level.Determine the variation of total stress and porewater pressure at depthh in the clay and the long-term variation in effective stress.Calculate the initial (before pumping) and the long-term (afterpumping) effective stress at the middle of the clay layer.The first layer 2m thick very fine wet sand with silt having water content of 8% and S=45% lying in 3.4m thick of fine sand with a moisture content of 14% and below of this fine sand is a clay with water content of 28% and a thickness of 15m.The water table is located 3m below the ground and they found out that there is a 1m of capillary rise that's being fully saturated. What is the approximate effective stress 12.9 meters below ground surface if all soils has 2.8 specific gravity and if there is 3m x 4m rectangular area carrying a uniform load of 240kpa applied to the ground surface?27 A dense silt layer has the following properties: void ratio = 0.71, specific gravity = 2.56. Free ground water is 9.8 m. below the ground. Capillary action rise will reach 5.76 meters. The soil above capilary action rise is dry while within the zone, it is saturated at 58.01%. Determine the effective pressure (in kPa) at a depth of 7.75 meters from the ground surface. Round off to three decimal places.
- 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: 128.657A layer of sand extends from group level at 9m and overlies a layer of clay of very Low permeability 6m. The water table is 6m below the surface of the sand the saturated unit weight of the sand is 19kn/m3.and that of the clay 20kn/m3.the unit weight of the sand above the ? table is 17kn/m3 .over a short period of time the water table lower by 3m. And expected to remain permanently at that Level. Determine the effective vertical stress at depth of 8 and 12m. Below the ground level.(a) immediately after the lowering of water table (b) several years after the lowering of the water table. Explain your answer for each step.The soil profile at a site consists of 5 m sand underlain by clay layer. The ground water table is 2 m below the ground surface. Average void ratio of sand is 0.52. Water content of clay is 42% and degree of saturation of sand above water table is 37%.Assume specific gravity of sand and clay is 2.65. 1. Compute the unit weight of clay. a. 19.82 kN/m³ b. 17.47 kN/m³ c. 18.62 kN/m³ d. 16.20 kN/m³ 2. Compute the total pressure 10 m below the ground surface. a. 185.41 kPa b. 160.25 kPa c. 140.53 kPa d. 153.62 kPa 3. Compute the effective pressure 10 m below the ground surface. a. 106.94 kPa b. 96.52 kPa c. 115.62 kPa d. 108.36 kPa
