United States Department of Transportation
i
Impact of increasing freight loads on rail substructure from fracking sand transportation.
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2014-03-01
[PDF-8.08 MB]
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Abstract:In this report the effect of surface infiltration of frac sand and heavy axle loads (HALs) were studied for their impact on the ballast layer.
Different combinations of ballast and fracking sand were constructed to observe long term trends of deformational behavior. The results
of HAL tests show that for all ballast an increased rate of strain accumulation averaging 0.07%/MGT for every 30 kip car load increase
occurs. The results of the surface spillage tests show an average increased rate of strain accumulation averaging 0.05%/MGT,
0.13%/MGT, and 0.31%/MGT for AREMA ballast #24, #4A, and #5 respectively, for a 7% increase in gravimetric water content. Modeling
conducted by the WiscRail ® program show and increased maintenance interval of 50-100%. The increased shipment of frac sand for
hydrocarbon recovery will affect the rail lines on which it is shipped. Increased monitoring and maintenance will need to be conducted for
the lines to operate in an efficient manner
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