Transportation Infrastructure Asset Damage Cost Recovery Correlated with Shale Oil/Gas Recovery Operations in Louisiana
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2020-07-01
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Edition:[Final Report], [August 2016-April 2019]
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Abstract:The rapid growth of shale gas exploration imposed a large number of heavy truck trips on Louisiana roadways. It is necessary to estimate the impact of the shale-gas related traffic. This study aimed to estimate the impact of the shale-gas related overweight truck trips on Louisiana roadways at the network and project level. RStudio software was employed to extract and reformat the overweight trips in the Haynesville area in 2006-2016 from the oversize/overweight (OS/OW) database. Network Analyst in the ArcGIS was utilized to assign these extracted overweight trips directly on the roadway network according to the shortest path method. The vehicle miles travelled (VMT) in terms of roadway classifications were estimated subsequently. In total, there were 9.7 million shale-gas related overweight VMT in 2006-2016, which translates into a damage cost of $17 million. On average, the damage cost due to the overweight trips in the construction of a single well approximates $5,264 and the damage cost per overweight vehicle travelling in one mile approximates $1.74. Due to the limitation of network-level analysis, project-level analysis was also conducted to quantify the damage cost due to overweight truck trips generated from shale gas recovery activities. The impacted area was divided into zones and overweight truck trips were estimated based on the numbers of wells and traffic interaction among zones. The AASHTOWare was adopted to obtain the pavement distress, and the results were matched to data collected from Pavement Management System (PMS). Then scenarios with no overweight truck loads were simulated to obtain the difference of service lives with/without shale gas truck traffic. Equivalent Uniform Annual Cost (EUAC) method was applied to calculate the damage costs of overweight truck trips, and damage costs for various truck gross weight levels for Louisiana low volume routes were obtained thereafter. The equipment trucks with gross vehicle weight (GVW) from 80-200 kips used in oil-gas industry were investigated. A permit fee regulation was recommended considering GVW and travelled distance to update the current one used by the Louisiana Department of Transportation and Development (DOTD).
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