Peaking Deflections of Flexible Pipe during Initial Backfilling Process
Publication: Journal of Transportation Engineering
Volume 133, Issue 2
Abstract
Most thermoplastic pipes exhibit peaking behavior during the initial backfilling process. It is shown with the actual field data that the peaking deflections can be beneficial for minimizing the long-term deflections of the pipe. An approach similar to the one proposed by Spangler is used to derive a formula for estimating the peaking deflections of thermoplastic pipe due to forces generated during the initial backfilling. The formula is tested in light of a number of field installation cases. The results show that the proposed formula predicts peaking deflections of both polyvinyl chloride and high density polyethylene pipes accurately under a variety of backfilled conditions.
Get full access to this article
View all available purchase options and get full access to this article.
References
Hoeg, K. (1968). “Pressure distribution on underground structural cylinders.” Rep. No. AFWL-TR-65–98, Air Force Weapons Laboratory, Research and Technology Division, Kirtland Air Force Base, New Mexico.
Masada, T. (2000). “Modified Iowa formula for vertical deflection of buried flexible pipe.” J. Transp. Eng., 126(5), 440–447.
Masada, T., and Sargand, S. M. (2001). “Construction of a flexible pipe system using controlled low strength material—Controlled density fill (CLSM-CDF).” FHwA/OH-2001/08, Final Rep., Ohio Dept. of Transportation, Cincinnati.
McGrath, T. J., Selig, E. T., Webb, M. C., and Zoladz, G. V. (1999). “Pipe interaction with backfill envelope.” FHwA-RD-98–191, Final Rep., the National Science Foundation and the Federal Highway Administration, Dept. of Civil and Environmental Engineering, Univ. of Massachusetts, Amherst, Mass.
Rogers, C. F. (1988). “Some observations on flexible pipe response to load.” Transportation Research Record. 1191, Transportation Research Board, National Research Council, Washington, D.C., 227–235.
Sargand, S. M., Hazen, G. A., and Masada, T. (1998). “Structural evaluation and performance of plastic pipe.” FHwA/OH-98/011, Final Rep., Ohio Dept. of Transportation, Cincinnati.
Sargand, S. M., Hazen, G. A., and Masada, T. (2002). “Field verification of structural performance of thermoplastic pipe under deep backfill conditions.” FHwA/OH-2002/023, Final Rep., Ohio Dept. of Transportation, Cincinnati.
Sargand, S. M., Masada, T., and Gruver, D. (2003). “Thermoplastic pipe deep-burial project in Ohio: Initial findings.” Proc., Pipeline 2003, Vol. 2, ASCE, Reston, Va., 1288–1301.
Sargand, S. M., Masada, T., and Schehl, D. J. (2001). “Soil pressure measured at various fill heights above deeply buried thermoplastic pipe.” Transportation Research Record. 1770, Transportation Research Board, National Research Council, Washington, D.C., 227–235.
Sargand, S. M., Masada, T., Tarawneh, B., and Yanni, H. (2004). “Use of soil stiffness gauge in thermoplastic pipe installation.” J. Transp. Eng., 130(6), 768–776.
Spangler, M. G. (1941). “The structural design of flexible pipe culverts.” Bulletin No. 30, Vol. XL, Iowa State College, Iowa Engineering Experiment Station, Iowa State College.
Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 133 • Issue 2 • February 2007
Pages: 105 - 111
Copyright
© 2007 ASCE.
History
Received: May 12, 2005
Accepted: Nov 8, 2005
Published online: Feb 1, 2007
Published in print: Feb 2007
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.