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 13, Problem 13.5P
To determine
Find the factor of safety against sliding along plane AB.
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Please calculate the critical factor of safety for the following slope configuration using the following m
ethods: Using slope stability charts
Layer 1
Clay
c=35 kN/sq.m
Friction Angle=0
Unit Weight-18 kN/cu.m
Layer 2
Silty Sand
c=5 kN/sq.m
Friction Angle=35 deg
Unit Weight=18 kN/cu.m
Slope Height=10 m
Slope Angle=30 Degrees
Layer 1
A cut slope was excavated in saturated clay for installation of water piping system. The
angle Bof cut slope is 45° with the horizontal. During excavation works, slope failure was
occurred when the cut reached a depth of 4.0 m. Previous soil explorations showed that a
hard layer was located at a depth of 6 m below the ground surface. The unit weight of
saturated clay is 17.5 kN/m. (Assuming an undrained condition).
1.
a)
Determine the undrained cohesion of the clay.
b)
Determine Factor of Safety (FoS) if the depth of cut slope is 3m.
c)
What is the maximum depth of saturated clay can be excavated if the Factor
of Safety (FoS) 1.4 to be implemented?
6. Plot the variation of Ovo, Dovo and u with depth for the soil profile overleaf.
4 m
Sand
Ym = 17.5 kN/m³
2 m
Ym = 17.0 kN/m3
Sandy gravel
3 m
Ysat = 19.5 kN/m3
3 m
Clay
Ysat = 19.0 kN/m³
%3D
Chapter 13 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 13 - Prob. 13.1PCh. 13 - Prob. 13.2PCh. 13 - Prob. 13.3PCh. 13 - Prob. 13.4PCh. 13 - Prob. 13.5PCh. 13 - Prob. 13.6PCh. 13 - Prob. 13.7PCh. 13 - Prob. 13.8PCh. 13 - Prob. 13.9PCh. 13 - Prob. 13.10P
Ch. 13 - Prob. 13.11PCh. 13 - Prob. 13.12PCh. 13 - Prob. 13.13PCh. 13 - Prob. 13.14PCh. 13 - Prob. 13.15PCh. 13 - Prob. 13.16PCh. 13 - Prob. 13.17PCh. 13 - Prob. 13.18PCh. 13 - Prob. 13.19PCh. 13 - Prob. 13.20PCh. 13 - Prob. 13.21PCh. 13 - Prob. 13.22PCh. 13 - Prob. 13.23PCh. 13 - Prob. 13.25PCh. 13 - Prob. 13.26PCh. 13 - Prob. 13.27CTPCh. 13 - Prob. 13.28CTPCh. 13 - Prob. 13.29CTP
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