Analysis Procedures for Evaluating Superheavy Load Movement on Flexible Pavements, Volume VIII: Appendix G, Risk Analysis of Buried Utilities Under Superheavy Load Vehicle Movements
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2019-08-01
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Edition:Final Report
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Abstract:The movement of superheavy loads (SHLs) has become more common over the years since it is a vital necessity for many important industries, such as chemical, oil, electrical, and defense. SHL hauling units are much larger in size and weight compared to the standard trucks. SHL gross vehicle weights may be in excess of a few million pounds, so they often require specialized trailers and components with nonstandard spacing between tires and axles. Accommodating SHL-vehicle movements requires the determination of whether the pavement is structurally adequate and involves the analysis of the likelihood of instantaneous or rapid load-induced shear failure. As part of the Federal Highway Administration project, Analysis Procedures for Evaluating Superheavy Load Movement on Flexible Pavements, methods for conducting buried utilities risk analyses in a flexible pavement under SHL-vehicle movements were developed. The available and widely accepted state-of-practice procedures to examine the structural integrity of flexible and rigid buried utilities subjected to standard traffic live load were adopted in this project. However, significant shortfalls in the existing methodologies, such as the impact of the layered nature of the existing flexible pavement, the role of unconventional surface loading from an SHL vehicle, and the effect of vehicle speed, were addressed by the use of 3D-Move Analysis software.(10) To account for the existence of buried utilities in 3D-Move Analysis, computed SHL vehicle-induced stresses were modified using a stress adjustment factor for buried utilities (SAFUtility). SAFUtility was determined based on results from large-scale pavement experiments conducted in this study.
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