Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Question
Chapter 12, Problem 12.12P
(a)
To determine
Find the undrained cohesion.
(b)
To determine
Find the overconsolidation ratio (OCR).
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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 maximum deviator stress at which the sample will fail in kPa. Show diagram
Three samples of loose sand were tested under consolidated undrained conditions. The failure stresses and excess pore water pressure for the soil sample is given below:
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A specimen of saturated sand was consolidated under an all-around pressure of 105kN/m2.The axial stress was then increased and drainage was prevented.The specimen failed when the axial deviator stress reached 70 KN/m2.The pore water pressure at failure was 50 KN/m2.Determine:i. Consolidated-undrained angle of shearing resistance, ɸii. Drained friction angle, ɸ′iii. Sketch Mohr’s circles and Failure Envelops in terms of total and effective stress.iv. Assuming soil specimen to be homogenous, sketch a network of failure planes.
Chapter 12 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- Following are the results of consolidated-undrained triaxial tests on undisturbed soils retrieved from a 4-m thick saturated clay layer in the field (sat = 20.7 kN/m3). a. Estimate graphically the Mohr-Coulomb shear strength parameters c' and '. b. Estimate the shear strength in the middle of the clay layer.arrow_forwardA sample of a cohesioness soil is subjected to axial principal effective stress (σ1’) of 300 kPa and radial principal effective stress (σ3’) of 100 kPa. Compute the angle of friction and the slip plane angle. Using these values, determine the normal and shear stress on the failure plane.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
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- In a drained triaxial compression test, a saturated specimen of cohesionless sand fails at a deviator stress of 450 kN/m2 when the cell pressure was 135 kN/m2. Find the effective angle of shearing resistance of sand. a.26 deg 30 min b.48 deg 15 min c.64 deg 15 min d.38 deg 30 min With Free Body Diagramarrow_forwardIn a drained triaxial compression test, a saturated specimen of cohesionless sand fails at a deviator stress of 450 kN/m2 when the cell pressure was 135 kN/m2. Find the effective angle of shearing resistance of sand. a. 64 deg 15 min b. 26 deg 30 min c. 38 deg 30 min d. 48 deg 15 minarrow_forward
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