A soil sample was consolidated under a cell pressure of 8 kg/cm², pore water pressure of 4.5 kg/cm². With no drainage permitted the cell pressure was raised to 10 kg/cm² results in increased pore water pressure to 5.75 kg/cm². The axial load was then increased to give a deviator stress of 6.25 kg/cm² (with the cell pressure at 10 kg/cm2), pore pressure is now noted. to be 7.15 kg/cm². The ratio of pore pressure coefficients B to A is

A soil sample was consolidated under a cell pressure of 8 kg/cm², pore water pressure of 4.5 kg/cm². With no drainage permitted the cell pressure was raised to 10 kg/cm² results in increased pore water pressure to 5.75 kg/cm². The axial load was then increased to give a deviator stress of 6.25 kg/cm² (with the cell pressure at 10 kg/cm2), pore pressure is now noted. to be 7.15 kg/cm². The ratio of pore pressure coefficients B to A is

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter12: Shear Strength Of Soil

Section: Chapter Questions

Problem 12.18P

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9. A consolidated drained test was carried out on a sandy clay under a cell pressure of 250 kPa. A constant back pressure of 120 kPa applied throughout the test. The dimensions of the sample were 76 mm x 38 mm. Addional test data recorded at failure were: Load transducer force = 368 N 3 Measured change in volume = 2.42 x 10 m³ Axial deformation = 2.05 mm Determine the major principal stress, o, at failure. (455 kPa)
An undisturbed soil sample, 100 mm in diameter and 200 mm high was tested in a tri-axial machine. The sample failed at an additional axial load of 3 kN with a vertical deformation of 20 mm. The failure plane was inclined at 50 deg. to the horizontal and the cell pressure was 300 kPa. a.) Determine the angle of internal friction. b.) Determine the deviator stress in kPa. c.)Determine the cohesion of the soil in kPa.
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A series of previous tests has established that the ultimate effective friction angle of a NC clayey soil is 19.2°. If a CD test is now performed on this soil with a cell pressure of 105 kPa, what would be deviator stress at failure? Given: o3 = Kao, where Ka 1-sin o' 1+sin o'
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An undisturbed soil sample, 110 mm in diameter and 220 mm in height, was tested in atriaxial machine. The sample sheared under an additional axial load of 3.35 kN with avertical deformation of 21 mm. The failure plane was inclined at 50˚ to the horizontal and the cell pressure was 300 kN/m2. i. Draw the Mohr circle diagram representing the above stress conditions, and from it determine:− Coulomb’s equation for the shear strength of the soil, in terms of total stress;− the magnitude and obliquity of the resultant stress on the failure plane.