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- Title
Response to overburden pressure of an HDPE pipe pulled in place by pipe bursting.
- Authors
Lapos, B. M.; Brachman, R. W. I.; Moore, I. D.
- Abstract
Measurements of vertical and horizontal pipe deflections are reported for a high-density polyethylene (HDPE) pipe experiencing an increase in vertical pressure after being pulled in place using pipe bursting techniques. Three tests were conducted to measure the diameter change of a 165 mm outside diameter HDPE pipe after replacing an intact clay pipe with an external diameter of 184 mm backfilled with a poorly graded dense sand. A fourth test measured the response of the HDPE pipe after replacing an intact clay pipe with an external diameter of 128 mm. Variable pipe deflections were measured in each test, which depended on the interactions among the broken clay pipe fragments surrounding the HDPE pipe. The orientation of the clay fragments controls whether the increase in vertical pressure is transferred immediately to the HDPE pipe. In some cases, the fractured clay pipe produced a structural ring encasing the HDPE pipe, thus providing additional hoop strength. Two of the replacement tests did not record diameter changes until 100 kPa because of the interaction amongst the clay fragments. The upsize test and one replacement test recorded diameter changes from a vertical pressure of 20 kPa, because there were no interactions observed among the clay fragments.
- Subjects
REGOLITH; PIPE; AIR ducts; CEMENT pipe &; tile; DRAINAGE pipes; NONMETALLIC pipe; POLYETHYLENE; THERMOPLASTICS; MINERAL aggregates
- Publication
Canadian Geotechnical Journal, 2007, Vol 44, Issue 8, p957
- ISSN
0008-3674
- Publication type
Article
- DOI
10.1139/T07-036