Page 43 - Buried Pipe Design
P. 43
External Loads 21
P
r
H B c
B d
B c
Figure 2.6 Curves for transition-width ratio. (Reprinted, by permission,
from Spangler and Handy, Soil Engineering, 4th ed., Harper & Row, 1982.)
Example Problem 2.2 What is the transition width for a 12-in pipe buried
6 ft deep?
H 6 ft 12 in
6
B 12 in 1 ft
C
From Fig. 2.6,
B d
2.35
B c
r sd p 0.5
B d
B d (transition) B c 2.35 (1 ft) 2.35 ft
B c
Tunnel construction. Marston’s theory may be used to determine soil
loads on pipes that are in tunnels or that are jacked into place through
