The coefficient of active earth pressure for a loose sand having an angle of internal friction of 30° is a) 1/3 b) 3 c) 1 d) 1/2
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- The soil profile presented in Figure Q3 shows a borehole at a site where the water level is at 4m below the ground surface, with fine sand saturated by capillary action. Take G₁ = 2.7, K₂ = 0.5. (a) Calculate the effective stress at the centre of the soft clay layer. (b) Plot the distributions of the effective stress with depth. (c) Calculate the horizontal total stress at 13m.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?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.
- What is the equivalent coefficient of permeability (k) for soil layers of k2 and k3? where k2= 1.03 k1 and k3= 2.45 k1 82 O HA 10 K2 N KS N С KA D Z! k1 1.740 .b k1 3.480 .C k1 17.400 .d k1 8.700What is the equivalent coefficient of permeability (k) for soil layers of k2 and k3? where k2= 1.75 k1 and k3 = 3.3 k1 10 8 B C K2 ~ K3 N K1 K4 .a k1 25.250 .b k1 12.625 .C k1 5.050 .d k1 2.525 28 co027 ncomect Consider the soil system shown below. 1m Water Fine 4m sand k 2 x 10 mm Coarse silt 4m k = 4 x 10 mm/s Fine 4m silt k 2 x 10 mm/s Datum Beneath the fine silt layer there is stratum of water-bearing gravel with a water pressure of 155 kPa. The surface of the sand is flooded with water to a depth of 1m. The excess hydrostatic head at the fine sand/coarse silt interface is cm. Your Answer 32 15 17
- A 3m × 4m rectangular area carrying a uniform lead 240 kPa is applied to the ground surface having a profile consist of 2 m of silly sand underlain by 3m of clay. The groundwater table is 3m below the ground surface. The sand has a unit weight of 14 kN/m³,the clay has the unit weight of 16 kN/m³ above water table and 20 kN/m³ below water table. a.) determine the approximate vertical stress increment 5m below ground surfaced caused by rectangular footing. b.) determine the total vertical stress at the bottom of the clay layer.Profile is shown in the figure A zone of capillary rise of 3.0m is on the sand layer overlaying clay. In this zone, the average degree of saturation is 70% 4m 3.0m 3.5m A Dry Sand & Capillary Zone CLAY Ground surface Ya 17.39KN/m³ e=0.5 Gs=2.71 Ground Water Table e=0.95 G-2.75 f a.) Compute for the effective stress right below B. b.) Compute the effective stress of C c.) Compute the effective stress of D d.) Compute the pore pressure at Point CWhat is the equivalent coefficient of permeability (k) for soil layers of k2 and k3? where k2= 1.75 k1 and k3 = 3.3 k1 10 8 IB K2 N K3 N K1 K4 .a k1 25.250 .b k1 12.625 .C k1 5.050 .d k1 2.525 28 12 4.
- H.W 5 (1+ we' |Yw• For a saturated soil, show that: Ysat Soil MechanicsCalculate 6,µand 6' with depth. H1 = 6 ft, H2 = 4 ft. H3= 9.0 feet Degree of Saturation in capillary rise zone ,S= 50% Dry sand Gs = 2.68, e=0.543 Clay Gs = 2.735 , e = 0.765 Bottom clay Gs = 2.752, e= 0.967 H3 Dry sand Clay; zone of capillary rise Clay Rock ーミIn a tri – axial test, a sample of saturated sand was consolidated under an all around pressure of 80 kPa. During the addition of vertical load, drainage was prevented and the pore water pressure was measured to be 30 kPa. The added vertical pressure at that time was 120 kPa. Compute the drained angle of friction. a. 43.06 degreesb. 53.16 degreesc. 33.06 degreesd. 23.26 degrees