PROBLEM: An infinite slope of granularsoil has a slope of 23. The saturated unitweight of sand is 21.5 kN/m3 and theeffective friction angle is 35. The sandhas a depth of 5 m. over a sledge rock.Depth of sand is measured vertically.Compute the factor of safety of theinfinite slope of sand layer whensubjected to partial seepage parallel tothe slope with water at a vertical depth of3 m. above the sledge rock.H=5mORÖCKB=23*

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Answered: PROBLEM: An infinite slope of granular…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A soil profile consists of 12 m of gravel overlying a clay layer of 3.5 m thickness,which in turn rests on a 4 m sand layer. The dry and saturated unit weights of thegravel are 17.5 kN/m3 and 20.5 kN/m3. Unit weights of the clay and the sand are20 kN/m3 and 19.5 kN/m3 respectively. Below the sand layer lies impermeablebedrock. If a wide excavation of 3 m depth is to be made in a relatively short time,draw the effective, total and pore pressure diagrams before and a long time afterthe excavation is made. Ground water table is 5 m below the ground surface.
8. Estimate the settlement of the center of the tank, shown in the sketch, due to consolidation of the 20-ft layer of clay. 80'diam. -Oil tank; 500 lb/sq ft 30' fine sand; 125 lb/cu ft 20'clay; qu = 1.3 tons/sq ft W = 54 % Wp = 26% W = 44% Isat = /15 lb /cu ft %3D Rock %3D %3D
Q.2 having k=1 cm /sec, dia. -0.75 m, n = 0.33 for soill and k= 2 cm /sec, dia. -0.6m, n=0.28 for soil2 in the setup shown, Compute: 1. Total head, elevation head, pressure head for points A, B, C, D and E. 2. Seepage velocity along soil 1 and soil 2 3. Force in soil 1 and soil 2 B so il 2 soil 1 E D 15 CH 25 cn T 7 cn 1 20 cn datum
20. A 17-m thick soil has water table 4 m. below the ground surface. The soil has a void ratio of 0.53 and specific gravity of 2.65. Above the water table, the soil has a degree of saturation equal to 40.67%. Direct shear test conducted on the soil shows that the an angle of internal friction of 26.04° and cohesion of 17.17 kPa. What is the potential shear strength (in kPa) on a horizontal plane at a depth of 9 m. below the ground surface? Round off to two decimal places.
A sandy soil with k = 3×10² cm/s contains a series of 5 mm thick horizontal silt layers spaced 300 mm on center. The silt layers have k= 5×10° cm/s. Compute k, and k̟ and the ratio k,/k. %3D
(1b) Estimate the settlement of a 10 m square area loaded 1 m at 100 kN/ m3 placed 1 m below ground level with ground water at the level of the footing. The static cone resistance values for the sand deposit are as follows: G.L to 6 m = 8000kN/m3,6 -11 mm = 10,000kN/, below 11 m =12,000kN/m3.
Please calculate the critical factor of safety for the following slope configuration using the following m ethods: Using slope stability charts Layer 1 Clay c=35 kN/sq.m Friction Angle=0 Unit Weight-18 kN/cu.m Layer 2 Silty Sand c=5 kN/sq.m Friction Angle=35 deg Unit Weight=18 kN/cu.m Slope Height=10 m Slope Angle=30 Degrees Layer 1
2. Consider a rectangular footing 3.2 m x 4.5 m to be constructed in a uniform clayey sand to support allowable loads as shown in Figure Q2. Assuming general shear failure would take place, determine the safety factor against bearing capacity failure when the ground water table is at 1.0 m above the ground surface. Comment on the obtained result.
The excavation shown below will be made on the clay for the construction of a highway. Potential Slope stability analysis is required on the slip plane. The ground is silty clay and c '= 18 kPa,' '= 20o and water = 100 kPa. At point a If the shear stress is 60 kPa, calculate the safety coefficient for this point.
A fully submerged infinite sandy slope has an inclination of 30° with the horizontal. The saturated unit weight and effective angle of internal friction of sand are 18 kN/m3 and 38°, respectively. The unit weight of water is 10 kN/m3. Assume that the seepage is parallel to the slope. Against shear failure of the slope, the factor of safety (round off to two decimal places) is
A level site underlain by fully saturated clays is cut over a few days as shown in the figure below. The water table is located at the ground surface across the site. Determine the resisting
The intensity of passive earth pressure at a depth of 6 m in a cohesionless soil with an angle of internal friction of 30° kN/m². when water rises to ground level is Take saturated unit weight of sand as 21 kN/m³ and y = 9.81 kN/m³. Y

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