Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 12, Problem 12.6P
To determine
Find the deviator stress at failure.
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During 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?
Refer to the constant-head permeability test arrangement in a two-layered soil as shown in Figure 8.2. During the test, it was seen that when a constant head of h1= 200 mm was maintained, the magnitude of h2 was 80 mm. If k1is 0.004 cm/sec, determine the value of k2 given H1 = 100 mm and H2 = 150 mm.
The 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 velocity
Chapter 12 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
Ch. 12 - Prob. 12.1PCh. 12 - Prob. 12.2PCh. 12 - Prob. 12.3PCh. 12 - Prob. 12.4PCh. 12 - Prob. 12.5PCh. 12 - Prob. 12.6PCh. 12 - Prob. 12.7PCh. 12 - Prob. 12.8PCh. 12 - Prob. 12.9PCh. 12 - Prob. 12.10P
Ch. 12 - Prob. 12.11PCh. 12 - Prob. 12.12PCh. 12 - Prob. 12.13PCh. 12 - Following are the results of...Ch. 12 - Prob. 12.15PCh. 12 - Prob. 12.16PCh. 12 - Prob. 12.17PCh. 12 - Prob. 12.18PCh. 12 - Prob. 12.19PCh. 12 - Prob. 12.20PCh. 12 - Prob. 12.21PCh. 12 - Prob. 12.22PCh. 12 - Prob. 12.23PCh. 12 - Prob. 12.24PCh. 12 - Prob. 12.1CTP
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- In laboratory consolidation tests on a clay specimen (drained on both sides), the following results were obtained:• thickness of clay layer = 25 mm• σ'1 = 50 kN/m2 , e1 = 0.75• σ'2 = 100 kN/m2 , e2 = 0.61• time for 50% consolidation (t50) = 3.1 minDetermine the hydraulic conductivity of the clay for the loading range.arrow_forwardA constant-head test was conducted on a sample of soil 15 cm long and 60 cm2 in cross-sectional area. The quantity of water collected was 50cm3 in 20 seconds under a head difference of 24 cm. Calculate the hydraulic conductivity. If the porosity of the sand is 55%, calculate the average velocity and the seepage velocity. Estimate the’ hydraulic conductivity of a similar soil with a porosity of 35% from the results of this test.arrow_forwardA clay sample was consolidated in a triaxial cell under a backpressure of 50 kPa and cell pressure of 150 kPa. The drainage valve was then closed and the cell pressure was increased to 200 kPa when the pore pressure increased to 98 kPa. What is Skempton’s B-parameter? The above sample was then subjected to a vertical deviator stress, which was increased from zero under undrained conditions. The sample failed when the pore water pressure was 160 kPa and the deviator stress was 70 kPa. What is Skempton’s A-parameter at failure? Assuming the clay is normally consolidated, find the friction angle in terms of effective stresses.arrow_forward
- A 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_forwardA soil sample has an initial unit weight of 16.7 Kilo-Newton per cubic meter with a saturation of 18 percent. If the saturation is increased to 41%, the unit weight is 18.3 KN/m^3. Solve for the Void Ratio and the Specific Gravity.ASAParrow_forwardIn a constant-head permeability test, a sample of soil 12 cm long and 6 cm in diameter discharged 1.5 x 10^(-3) m^3 of water in 10 minutes. The head difference in two piezometers A and B located at 1 cm and 11 cm, respectively, from the bottom of the sample is 2 cm. Determine the hydraulic conductivity of the soil. What is the soil type tested?arrow_forward
- A constant-head test was conducted on a sample of soil 15 cm long and 60 cm2 in cross-sectional area. The quantity of water collected was 50 cm3 in 20 seconds under a head difference of 24 cm. Calculate the hydraulic conductivity. If the porosity of the sand is 55%, calculate the average velocity and the seepage velocity. Estimate the hydraulic conductivity of a similar soil with a porosity of 35% from the results of this test. What is the soil type tested?arrow_forwardDuring a subsurface exploration, an undisturbed soil sample was collected in the field using a split-spoon sampler. for laboratory evaluation. The sample has a diameter of 1.375 in. diameter, 18 in. length, and a wet weight of 1.85 lb. If the oven-dried weight was 1.5 lb and Gs = 2.74; calculate the following:(a) Wet unit weight.b) Moisture content.c) Dry unit weight.d) Void ratio.e) Degree of saturation.arrow_forwardThe soil profile at a site consists of a top 4 m layer of dense sand followed by 2 m of clay, which is underlain by a stiff stratum. The water table is at 2 m below the ground level. The follow- ing data was obtained from a consolidation test on an undisturbed sample obtained from the middle of the clay layer: water content 36%, specific gravity of the clay grains = 2.72, compression index = 0.72, recompression index = 0.07, preconsolidation pressure = 85 kPa. The bulk and saturated unit weights of the sand are 17 kN/m' and 18.5 kN/m' respectively. The ground level was raised by placing 2 m of compacted fill with a unit weight of 20 kN/m'. Estimate the final consolidation settlement. It is proposed to construct a warehouse covering a large area on top of the raised ground, which is expected to impose a pressure of 25 kPa. What would be the additional consolida- tion settlement?arrow_forward
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