Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 12, Problem 12.9P
(a)
To determine
Find the friction angle
(b)
To determine
Find the friction angle
(c)
To determine
Find the friction angle,
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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 strength
2.41 The device shown consists of a disk that is rotated by a
shaft. The disk is positioned very close to a solid boundary. Be-
tween the disk and the boundary is viscous oil.
a. If the disk is rotated at a rate of 1 rad/s, what will be the ra-
tio of the shear stress in the oil at r =
2 cm to the shear stress at
r =
3 cm?
b. If the rate of rotation is 2 rad/s, what is the speed of the oil
in contact with the disk atr = 3 cm?
c. Ifthe oil viscosity is 0.01 N s/m² and the spacing y is 2 mm,
what is the shear stress for the conditions noted in part (b)?
2
Pipe
Oil film
Cylinder
PROBLEM 2.40
The rod has a diameter of 16 mm and weight of
16 N/m. (Figure 1)
Part A
Determine the maximum torsional stress in the rod at a section located at A due to the rod's weight.
Express your answer to three significant figures and include the appropriate units.
HA
?
N
(TA) max = 37.7 • 10
m-
Figure
1 of 1
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Chapter 12 Solutions
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