Page 114 - Buried Pipe Design
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90 Chapter Three
Depth of Cover (Feet)
Vertical Deflection (Percent)
Figure 3.9 Vertical deflection curves for 60-in HDPE pipe at various soil den-
sities. Solid lines are actual test data, and the dashed lines are approximated
curves for intermediate densities. For the most part, curves are concave
downward. The 95 percent curve could be approximated by a straight line.
All curves could be approximated by bilinear lines.
Height of Cover (Feet)
B = Start of Wall Buckling
C = Start of Wall Crushing
Vertical Deflection (Percent)
Figure 3.10 Vertical deflections for the six load-deflection tests on steel pipe.
Note that the curves are concave downward and have knees corresponding to
preconsolidation (compaction) of the soil.
