Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 9, Problem 9.9P
To determine
Find the maximum permissible depth (H) of the cut before the occurrence of heaving.
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H.W No.1: A 24 inch circular non reinforced concrete pipe is to be installed in a 5 foot
wide trench with 10 feet of cover over the top of the pipe. The pipe will be backfilled
with ordinary clay weighing 120 pounds per cubic foot. Assume a Type 4 Installation.
The wall thickness for a pipe with a B wall is 3-inches per ASTM C76. Transition width
at top of pipe is 6 ft.
Find: The required three-edge bearing test strength for nonreinforced pipe and the
ultimate D-load for reinforced pipe.
Wide Trench Installation
H
Bd
Bc
Q14. A contractor is excavating the below trench. The contractor is supposed to dig the
trench 5ft deep and 3ft wide. The soil was tested to have an approximately swell factor of
112% and a shrinkage factor of 14%. The contractor is placing a 10" water pipe in the trench
and then backfilling with the soil that was removed. The dimensions are on center line.
Does the contractor have enough soil to backfill the trench, or will he /she have to need
more? If more soil are needed, how much does the contractor need to bring in. Answer in
LCY.
40ft
3ft
16ft
40ft
20ft
24ft
60ft
Please explain the answer.
Chapter 9 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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ISBN:9781305970939
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Publisher:Cengage Learning