CHARACTERISING RAILWAY SUBSTRUCTURE LAYERS FOR REHABILITATION DESIGN

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Manuela
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CHARACTERISING RAILWAY SUBSTRUCTURE LAYERS FOR REHABILITATION DESIGN

Mensagem por Manuela » 05 Set 2016, 14:40

Autores: VAN VREDEN, P H, GRÄBE, P J and HARTMAN, A M.

ABSTRACT:
Current railway substructure design methods rely heavily on an accurate assessment of the
in-situ material properties, particularly the modulus of the subgrade and substructure layers.
This information is used in foundation design models to determine the required cover to
prevent deformation and failure of support. This paper presents typical data obtained during a
rehabilitation design investigation to accurately evaluate the modulus of the in situ subgrade
and substructure layers using Pencel pressuremeter tests, dynamic cone penetrometer tests,
deflection measurements through remote video monitoring and lightweight drop-weight tests.
Standard soil parameters related to the grading, plasticity and CBR of the investigated
materials do not have any direct relationship with the modulus values that were obtained. This
is specifically true for sand materials where good or poor CBR and plasticity values can give a
misleading indication of the formation modulus.
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