. A stratum of sand and a stratum of clay have the same thickness of 3 m. The coefficient of 1 of sand is th of coefficient of 5 compressibility compressibility of clay and the permeability of sand is 10,000 times that of the clay. Assuming the same void ratio, the ratio of the consolidation time for the clay to that of the sand is

. A stratum of sand and a stratum of clay have the same thickness of 3 m. The coefficient of 1 of sand is th of coefficient of 5 compressibility compressibility of clay and the permeability of sand is 10,000 times that of the clay. Assuming the same void ratio, the ratio of the consolidation time for the clay to that of the sand is

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter6: Hydraulic Conductivity

Section: Chapter Questions

Problem 6.11P

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Find the C, and the "apparent" OCR for a superficial clay stratum that is 4m thick. The water is at the surface. A sample of the clay has a water content of 27.9%, and a specific gravity of 2.65. An oedometer test showed the following results: Voids Ratio 0.736 0.733 0.73 0.675 0.638 0.6 Vertical Effective Stress 15 28 60 230 480 930
A stratum of sand and a stratum of clay have the same thickness of 3 m. The coefficient of 1 compressibility of sand is 5th of coefficient of compressibility of clay and the permeability of sand is 10,000 times that of the clay. Assuming the same void ratio, the ratio of the consolidation time for the clay to that of the sand is
The coefficient of permeability of sand at a void ratio of 0.80 is 0.47 mm/s. Estimate the coefficient of permeability of this sand at a void ratio of 0.50.
In general, clays tend to have a more pronounced failure: -True -False
The coefficient of earth pressure at rest for a sand having the Poisson's ratio value of 0.25 is. ?
2- An undisturbed clay has a preconsolidation pressure of 200 lb/ft. A laboratory consolidation tests yield the following data: o' (lb/ft') e 0.92 3,130 6,270 0.77 a) Determine the void ratio that corresponds to a pressure of 5,800 (Ib/ft). b) Determine the coefficient of volume compressibility for the pressure range stated. c) If C, = 1 x 10* in?/sec, determine hydraulic conductivity, k in in/sec corresponding to the average void ratio within the pressure range.
A CID TXC test was performed on a sample of sand. At the end of consolidation, the back pressure was 140 kPa, and the cell pressure was 340 kPa. At failure, the deviator stress was (ơ1 – 03)f = 200 kPa. a. What was the total pore water pressure, u, at failure? b. Calculate the principle effective stresses, ơi' and os', at failure. c. Calculate the friction angle, d', for this soil.
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