Principles Of Foundation Engineering 9e
9th Edition
ISBN: 9781337705035
Author: Das, Braja M.
Publisher: Cengage,
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Chapter 3, Problem 3.20P
To determine
Find the peak and residual undrained shear strength of the clay.
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Students have asked these similar questions
A vane shear test was performed on
saturated clay layer at the site and it
is noted that a torque of 45 N-m was
required to shear the soil. In order to
remould the soil, the vane was rotated
rapidly under the certain value of
torque say "x". If the sensitivity of
the clay is 8, then calculate the value
of "x" in N-m.
Assume diameter and length of the
vane to be 70 mm and 130 mm
respectively, consider two way shearing,
Problem 3:
A vane shear test was conducted on a soft clay.
The vane was 112 mm in height and 70 mm in
diameter. It was pressed and fully penetrated
into the clay with an applied torque, T. The test
gave a result of corrected undrained shear
strength of 34.65 kPa with a liquid limit of the
soil equal to 60 and a plastic limit of 25.
Determine the following:
a) the torque T applied
b) the unconfined compressive strength of clay
c) the unconfined compression strength of clay
in the remolded state if the soil sample has a
sensitivity of 3.5.
2. A sample of saturated clay of height 20 mm and water content 30% was tested in an
oedometer. Loading and unloading of the sample were carried out. The thickness Hf of
the sample at the end of each stress increment/decrement is shown in the table below.
o: (kPa)
H, (mm)
100
200
400
200
18.68
100
18.75
20
19.31
18.62
a. Plot the results as void ratio versus o'z (log scale).
b. Determine Cc and Cr.
Chapter 3 Solutions
Principles Of Foundation Engineering 9e
Ch. 3 - Prob. 3.1PCh. 3 - Prob. 3.2PCh. 3 - Prob. 3.3PCh. 3 - Refer to Figure P3.3. Use Eqs. (3.10) and (3.11)...Ch. 3 - Prob. 3.5PCh. 3 - Prob. 3.6PCh. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - Prob. 3.9PCh. 3 - Prob. 3.10P
Ch. 3 - Prob. 3.11PCh. 3 - Prob. 3.12PCh. 3 - Prob. 3.13PCh. 3 - Prob. 3.14PCh. 3 - Prob. 3.15PCh. 3 - Prob. 3.16PCh. 3 - Prob. 3.17PCh. 3 - Prob. 3.18PCh. 3 - Prob. 3.19PCh. 3 - Prob. 3.20PCh. 3 - Prob. 3.21PCh. 3 - Prob. 3.22PCh. 3 - Prob. 3.23PCh. 3 - Prob. 3.24PCh. 3 - Prob. 3.25PCh. 3 - Prob. 3.26PCh. 3 - Prob. 3.27PCh. 3 - Prob. 3.28PCh. 3 - Prob. 3.29PCh. 3 - Prob. 3.30PCh. 3 - Prob. 3.31P
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- A vane shear test was conducted in a saturated soft clay, using a vane. When the vane was rotated at the standard rate of , the torque measured in the torque meter increased to , and with further rotation reduced to . Determine the peak and residual undrained shear strengths of the clay. (Enter your answers to three significant figures.) Peak undrained shear strength Residual undrained shear strengtharrow_forwardSITUATION 5: A sand sample is subjected to direct shear testing at it's (in - situ) water content. Two tests are performed. For one of the tests, the sample shears at a stress of 400 kPa when the normal stress is 600 kPa. From these data, 15. Determine the value of the apparent cohesion. c. 230 kPa d. 221 kPa а. 100 kPa b. 179 КРа 16. Determine the corresponding angle of internal friction. a. 22.65 degrees b. 26.57 degrees c. 32.54 degrees d. 18.43 degreesarrow_forwardA vane shear test was conducted in a saturated clay. The height and diameter of the rectangular vane were 4 in. and 2 in., respectively. During the test, the maximum torque applied was 230 lb-in. The clay soil has a undrained shear strength of 7.844 psi. It has a liquid limi of 58 and a plasic limi o 29. What would be the corrected undrained shear strength of the clay for design purposes? Using Bjerum's relationship for λ. λ = 1.7 - 0.54 log[PI(%)]arrow_forward
- A sample of sand is sheared in the following manner. First an all around normal stresso 350 kPa is applied to the sample. Next a shear stress is applied to the horizontal pia while the normal stress remains constant. The shear stresses at failure are + 186 kPa. Ihe initial stress and stress condition at failure are shown below 350 kPa 350 kPa 186 kPa 350 kPa 350 kPa ー550 kPa 550 kPa 186 kPa 350 kPa 350 kPa Initial Conditions At Failure Determine the Following: fo A) Assuming c, = 0, draw a failure envelope for the soil. Define the friction angle ( the soil. B) Draw the Mohr's Circle at failure for the test. C) Show the location of the pole. D) Define the maximum and minimum principal stresses at failure. E) Define the normal stress corresponding to the maximum shear stressarrow_forwardShow solution. The answer must be A. 36.87 B. 14arrow_forwardA sample of dry sand is tested in direct shear. A normal load equivalent to 96 kPa is imposed for the test. The shearing force applied to fail the sample is increased until shearing does occur. The shear stress at failure is 65 kPa. What is the angle of internal friction f for the sand?arrow_forward
- A vane shear test was conducted in a saturated soft clay,using a 100 mm 3 200 mm vane. When the vane was rotatedat the standard rate of 0.1°/s, the torque measured inthe torque meter increased to 60 N ? m, and with further rotationreduced to 35 N ? m. Determine the peak and residualundrained shear strengths of the clay.arrow_forwardHow to solve this question?arrow_forwardYarrow_forward
- a. A vane shear test was conducted in a saturated clay. The height and diameter of the rectangular vane were 4 in. and 2 in., respectively. During the test, the maximum torque applied was 230 lb-in. Determine the undrained shear strength of the clay. b. The clay soil described in part (a) has a liquid limit of 58 and a plastic limit of 29. What would be the corrected undrained shear strength of the clay for design purposes? Use Bjerrum’s relationship for λ [Eq. (3.40a)].arrow_forwarda. A vane shear test was conducted in a saturated clay. The height and diameter of the rectangular vane were 4 in. and 2 in., respectively. During the test, the maximum torque applied was 230 lb-in. Determine the undrained shear strength of the clay. b. The clay soil described in part (a) has a liquid limit of 58 and a plastic limit of 29. What would be the corrected undrained shear strength of the clay for design purposes? Use Bjerrum’s relationship for λarrow_forwardCan TRIAXIAL TESTS be performed on sand samples? Briefly explain. The results of an undrained triaxial test on a clay soil sample are given in table below Cell Pressure (kN/m2) 200 400 600 Additional Axial Load at Failure (N) 342 388 465 Each sample, originally 76mm long and 38mm in diameter, experienced a vertical deformation of 5.1mm. Evaluate the stress at failure for each cell pressure given in table above. Draw Mohr Circles and determine the shear strength parameters of the soil.arrow_forward
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