Field performance of in-service cast iron gas reticulation pipe buried in reactive clay

Chan, D., Rajeev, P., Kdikara, J., & Gallage, C. (2016) Field performance of in-service cast iron gas reticulation pipe buried in reactive clay. Journal of Pipeline Systems Engineering and Practice, 7(2), Article Number-04015025.

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Field instrumentation of an in-service cast iron gas pipe buried in a residential area is detailed in this paper. The aim of the study was to monitor the long-term pipe behavior to understand the mechanisms of pipe bending in relation to ground movement as a result of seasonal fluctuation of soil moisture content. Field data showed that variation of soil temperature, suction, and moisture content are closely related to the prevailing climate. Change of soil temperature is generally related to the ambient air temperature, with a variation of approximately −3°C −3°C per meter depth from the ground surface in summer (decrease with depth) and winter (increase with depth). Seasonal cyclic variation in moisture content was observed with maxima in February and March, and a minimum around September. The pipe top was under tensile strain during summer and subsequently subjected to compressive strain as soil swelling occurred as a result of increase in moisture content. The study suggests that downward pipe bending occurs in summer because of soil shrinkage, while upward pipe bending occurs in winter when the soil swells.

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ID Code: 95132
Item Type: Journal Article
Refereed: Yes
Keywords: Field instrumentation, Expansive soil, Soil moisture content, Soil movement, Meteorological conditions, Cast-iron gas main
DOI: 10.1061/(ASCE)PS.1949-1204.0000223
ISSN: 1949-1204
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Civil Geotechnical Engineering (090501)
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 American Society of Civil Engineers
Deposited On: 26 Apr 2016 02:03
Last Modified: 27 Apr 2016 03:41

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