United States Department of Transportation
i
High-speed passenger rail tie-ballast interaction.
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2015-05-01
[PDF-482.16 KB]
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Abstract:This Research Results Report presents
evidence of poor tie support and increased
applied loads that were used to determine the
“root cause” of transient and permanent vertical
displacements at two Amtrak bridge transitions.
These results are from a Federal Railroad
Administration (FRA) study on differential
movement at high-speed track transitions. Data
from instrumented high-speed passenger bridge
transitions along Amtrak’s Northeast Corridor
(NEC) near Chester, Pennsylvania show a
relation between measured permanent vertical
displacements of ballast and a gap between the
bottom of the tie and top of the ballast. The
existence of a gap at locations experiencing
large permanent ballast displacements suggests
that poor tie support amplifies the applied loads
to the ballast which accelerates ballast and tie
degradation. Therefore, the “root cause” of
permanent vertical displacements at the
instrumented high-speed passenger transition
zone locations is concluded to be an increase of
applied loads to the ballast and adjacent ties
resulting from poor tie support at the
instrumented tie.
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