CHARACTERIZATION OF THE FOULED BALLAST LAYER IN THE SUBSTRUCTURE OF A 19TH CENTURY RAILWAY TRACK UNDER RENEWAL

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CHARACTERIZATION OF THE FOULED BALLAST LAYER IN THE SUBSTRUCTURE OF A 19TH CENTURY RAILWAY TRACK UNDER RENEWAL

Mensagem por Manuela » 05 Set 2016, 16:24

Autores: EDUARDO FORTUNATO, ANTOÁ NIO PINELO and MANUEL MATOS FERNANDES.

SOILS AND FOUNDATIONS Vol. 50, No. 1, 55–62, Feb. 2010
Japanese Geotechnical Society.


ABSTRACT
The purpose of these ˆeld and lab studies undertaken during rehabilitation work being done on an ancient railway
line was to characterize a layer of ballast fouled with soil found in the track substructure. The ˆeld studies included the
characterization of the thickness, grain size distribution and void ratio of the fouled ballast layer, as well as a large
number of plate load tests, both on the fouled ballast layer and on the subgrade. The resilient behaviour of the fouled
ballast was evaluated in the lab by cyclic triaxial tests on large size reconstituted specimens with distinct fouling indexes
(diŠerent grain size distribution) and distinct humidity states (dry or wet). The results obtained were used as support
for the decision to maintain the fouled ballast layer under the new sub-ballast in a number of stretches of the renewed
line.
Key words: cyclic triaxial tests, fouled ballast, plate load tests, resilient modulus, track rehabilitation (IGC:
C8/D6/H6)
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