A mechanistic approach to determine the impacts of small utility cuts in urban street pavements.
Item
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Title
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A mechanistic approach to determine the impacts of small utility cuts in urban street pavements.
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Identifier
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AAI9732928
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identifier
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9732928
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Creator
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Humphrey, Mewburn Hilary.
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Contributor
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Adviser: Neville A. Parker
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Date
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1997
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Civil | Geotechnology
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Abstract
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Utility cuts in urban street pavements have been observed to be a major cause of premature pavement deterioration, with related high maintenance and road user costs.;This research determined that when a small utility cut {dollar}(3\sp\prime - 0\sp{lcub}\prime\prime{rcub}{dollar} x {dollar}3\sp\prime-0\sp{lcub}\prime\prime{rcub}{dollar}) is opened in a city street pavement, the surrounding soil stretches towards the cut, until a state of plastic equilibrium is achieved. The localized stretching was found to extend a distance of 3.25 to 3.5 feet from the face of the cut, for utility cuts varying from 3 to 5 feet deep.;The research used elasto-plastic theory and three dimensional finite element methods to analyze the pavement materials around the open utility cut, for unsupported depths of up to 5 feet. The ANSYS - Engineering Analysis System, Revision 5.2, 1995 was used in this analysis. The research used three density combinations, ranging from 110 to 130 lb/ft{dollar}\sp2{dollar} in the fill/subgrade material, and 125 to 140 lb/ft{dollar}\sp2{dollar} in the base material. Three {dollar}\phi{dollar} scenarios were used per combination, ranging from 30{dollar}\sp\circ{dollar} to 38{dollar}\sp\circ{dollar} in the fill/subgrade, and 32{dollar}\sp\circ{dollar} to 40{dollar}\sp\circ{dollar} in the base. For similar {dollar}\phi{dollar} values, soil stretching around the cut was not found to be a function of soil density. Hence a detailed study was done on the mid-range properties of the materials selected for the analysis, to obtain a representative set of results on predictable pavement distresses in the vicinity of open utility cuts. The research produced tables and charts to enable agencies to predict the distress impacts to the pavement in the area surrounding the utility cut. The results are expected to enable agencies to predict the appropriate PCI deduct values for small utility cuts in city street pavements, when routine pavement evaluations are done. Further, it is expected that from the results of this research, that an appropriate fee structure could be developed for pricing utility companies, when applications are made for small utility cuts.;This research is expected to explain and theoretically extend/complement work done by others which reported physical observations of surface distresses and abnormal pavement deflections in the vicinity of utility cuts.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
