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Load Development on a Buried Rigid Conduit

J. Scott Griffith and Chester A. Keeney
Journal (Water Pollution Control Federation)
Vol. 44, No. 9, Annual Conference Issue (Sep., 1972), pp. 1713-1717
Stable URL: http://www.jstor.org/stable/25037600
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Load Development on a Buried Rigid Conduit
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Abstract

The loads imposed on an 8-in. (20.2-cm) rigid pipeline 12 ft (3.7 m) in uncompacted backfill have been measured for 6 yr with strain gauge load cells. During the first saturation of the backfill after installation, the load decreased from 1,500 to 725 plf (2,240 to 1,080 kg/lin m), then increased to 1,700 plf (2,530 kg/lin m) even though the rain continued. After the second saturation period, the line had a net increase of about 300 plf (450 kg/lin m). The greatest rate of load increase occurred during the first year, and a smaller but regular annual increase has continued with superimposed seasonal variations. After 6 yr, the loads are approximately equal to the maximum predicted by Marston's load formula for positive projecting conduit conditions, and the experiment is continuing.

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