Investigation of Backfill Compaction Effect on Buried Concrete Pipes
Main Article Content
Abstract
The present study deals with the experimental investigation of buried concrete pipes. Concrete pipes are buried in loose and dense conditions of gravelly sand soil and subjected to different surface loadings to study the effects of the backfill compaction on the pipe. The experimental investigation was accomplished using full-scale precast unreinforced concrete pipes with 300 mm internal diameter tested in a laboratory soil box test facility set up for this study. Two loading platforms are used namely, uniform loading platform and patch loading platform. The wheel load was simulated through patch loading platform which have dimensions of 254 mm *508 mm, which is used by AASHTO to model the wheel load of a HS20 truck. The pipe-soil systems were loaded up to pipes collapse. Pipes were instrumented with strain gauges to measure circumferential strains, in addition to dial gauges, for measurements of the pipe vertical deflections and settlement of the loading platforms. The test results indicated that flexure governed the buried pipe behavior. Flexural cracks formed slightly before the ultimate load. A comparison of soil backfill, between a loose and dense compaction, showed that the dense backfill improve largely the pipe installation and the strength of
pipe-soil system
Article Details
Section
How to Cite
References
•ACI Code 318M-05 "Building Code Requirements for Structural Concrete and Commentary (ACI 318M-08)", American Concrete Institute 2005.
•ACPA, Design Data 1" Highway Live Loads on Concrete Pipe", American Concrete pipe Association, 2009.
•Bashir R. "Analysis and Design of Buried Pipelines" M.Sc. Thesis, King Fahd University of Petroleum & Minerals Dhahran, Saudi Arabia, 2000.
•Das, B. M., "Principles of Foundation Engineering", Brooks/Cole Engineering Division, 1984.
•Haque M. M. "Comparison of Behavior of 1520 mrn (60 in.) Concrete Pipe with SIDD Design Under Deep Cover", M.Sc. Thesis, Ohio University, 1998.
•Mehta P. K. and Monteiro P. M. " Concrete: Microstructure, Properties, and Materials", Third Edition, McGraw-Hill, 2006.
• Moore I. D., Lapos B., and Mills C., "Biaxial testing to investigate soil-pipe interaction of Buried fiber reinforced cement pipe" Transportation Research Record No. 1868, Soil Mechanics, Washington, DC USA, 2004.
• Moser A. P. and Folkman S. "Buried Pipe Design" Third edition, McGrawHill, 2008.
• Selig E. T. and Packard D. L., "Buried Concrete Pipe Trench Installation Analysis" ASCE, Journal of Transportation Engineering, Vol. 113, No. 5, September, 1987, pp.485-501.
• U.S. Army Corps of Engineers, USACE " Settlement Analysis: Stress Distribution in Soil" EM 1110-1-1904, 1990.
• Wong L.S., Allouche E.N. and Moore I.D. "Long-Term Monitoring and Analysis of Full Scale Concrete Pipe Test Beds" ASCE, Proceedings of Pipeline Division Specialty Conference, 2002.
• WRI, Wire Reinforcement Institute "TECH FACTS: Metric Welded Wire Reinforcement for Concrete Pipe", 2003.