Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 12, Problem 12.8P
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Find the average relative density of sand between the depths of 3 m and 6 m.
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A soil profile consisting of three layers is shown below. Calculate the values of σ, μ, and σ’ at points A, B, C, and D.
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A soil profile consisting of three layers is shown in the below figure. Calculate the values of o, u, and o' at points A, B, C, and D for the following case:
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Fundamentals of Geotechnical Engineering (MindTap Course List)
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- The following data are from a direct shear test on an undisturbed soil sample. Represent the data by a Mohr Circle and compute the minor principal stress. Normal pressure = 16.2 kN/m2; Tangential pressure = 14.4 kN/m2, Angle of internal friction = 24°; c = 7.2 kN/m2. Show diagramarrow_forwardThe following data are for a falling-head permeability test: Length of the soil sample = 140 mm Diameter of the soil sample = 70 mm Area of the standpipe = 19.6 mm2 At time t =0, head difference = 500 mm At time t = 7 minutes, head difference = 350 mmarrow_forwardDuring a constant head permeability test on a sand sample, 260 x 10^3 mm^3 of water were collected in 2 minutes. If the sample had a length of 100 mm, a diameter of 40 mm and a maintained head of 200 mm. What is the coefficient of permeability in mm/s?arrow_forward
- A standard penetration test was carried out in a normallyconsolidated sand at 25 ft depth where the N60 was determinedto be 28. The unit weight of the sand is 110 lb/ft3, andthe grain-size distribution suggests that D50 5 1.2 mm andCu 5 3.2. The age of the soil since deposition is approximately5000 years. Determine the relative density using thedifferent correlations discussed in Section 3.15arrow_forwardThe results of a constant-head permeability test for a fine sand sample having a diameter of 70 mm and a length of 140 mm are as follows (refer to Figure 7.5):• Constant-head difference = 550 mm• Water collected in 7 min = 450 cm3• Void ratio of sand = 0.8Determine:a. Hydraulic conductivity, k (cm/sec)b. Seepage velocityarrow_forwardGeotechnical Engineering The following are the results of a standard penetration test in sand. Estimate the soil friction angle at the 3.0 meter depths given N60 =7 . Note that the water table was not observed within a depth of 12 m below the ground surface. Assume that the average unit weight of sand is 15.5 kN/m3 and Pa = 100 kN/m2. a. 44.6 b. 37.6 c. 38.9 d. 34.4arrow_forward
- Subject Geotechnical engineering : soil mechanics A layer soil shown has the following data H1= 3m. K1= 2x10^-2 cm/sec H2= 4m K2= 3.2x10^-2 cm/sec H3= 6m K3= 4.1 x 10^ -2 cm/sec Compute the equivalent coefficient of permeability in vertical direction. Compute the velocity if h= 4marrow_forwardQ.1 In a falling head permeability test drop in head OCcurs from 60 m to 40 m in 10 minutes. The cross-sectional area of soil sample and stand pipe is 20 cm2 and 2 cm2 respectively. If the length of the soil sample is 15 cm then the permeability of soil sample in mm/sec is..arrow_forwardA cylindrical sample of soil having a cohesion of 80 kN/m2 and an angle of internal friction of 20° is subjected to a cell pressure of 100 kN/m2. Determine the angle made by the failure plane with the axis of the sample.arrow_forward
- Refer to Problem 3.4. Using Eq. (3.22), determine the average relative density of sand.arrow_forwardThe results of a constant-head permeability test for a fine sand sample having a diameter of 150 mm and a length of 300 mm are as follows • Constant-head difference = 500 mm • Water collected in 5 min = 350 cm3 • Void ratio of sand = 0.61 Determine: a. Hydraulic conductivity, k (cm/sec) b. Seepage velocityarrow_forwardEstimate the vertical coefficient of permeability for a uniform clay deposit where representative test results are as shown: LL = 92, PL = 34 percent of clay size particles in the soil =40 void ratio ( approximate ) = 1.75arrow_forward
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