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Technical Committee 202 /
Comité technique 202
a load concentration on the GR strips with an inverse triangular load
distribution on those GR strips. This is in agreement with observations
in scaled model tests, numerical analysis and field measurements.
Recent developments in pavement
foundation design
Brown S.F. and
Thom N.H.
United Kingdom A Precision Unbound Materials Analyzer (simplified version of the
repeated load triaxial test) has been developed to quantify both resilient
and plastic strain characteristics.
Unlike CBR testing, this technique can be very useful in allowing a
designer to evaluate alternative foundation material combinations in
order to achieve a desired foundation.
Table 5. Applications of Geosynthetics
Title of Paper
Authors
Country
Summary of Main Contribution
Load transfer mechanisms in
geotextile-reinforced
embankments overlying voids:
experimental
and
numerical
approaches
Huckert
A.,
Garcin P., Villard
P.,
Briançon L.
and Auray G.
France
Full-scale experiments were conducted on non-cohesive granular
embankments to study load transfers of geosynthetics-reinforced
embankments prone to sinkholes.
Numerical model was performed to provide a better understanding of
the load transfers towards the edges of the cavity
Performance verification of a
geogrid mechanically stabilised
layer
Wayne M., Fraser
I., Reall B. and
Kwon J.
USA
Series of full-scale field tests and model tests were conducted to
evaluate performance of a geogrid- stabilized unpaved aggregate base
overlaying relatively weak and non-uniform subgrade soils.
The results confirm that the geogrid promotes improved aggregate
confinement and interaction, leading to enhanced structural
performance of the unpaved aggregate base.
Performance
Assessment
of
Synthetic Shock Mats and Grids in
the Improvement of Ballasted
Tracks
Indraratna
B.,
Nimbalkar
S.,
Rujikiatkamjorn
C., Neville T. and
Christie D.
Australia
Full-scale field tests were conducted on rail track sections in the towns
of Bulli and Singleton (Australia) to measure track deformations
associated with cyclic stresses and impact loads.
The results indicated that the use of geocomposites as reinforcing
elements for ballast proved to be a feasible and economically attractive
alternative.
Characterization
of
Soil-
Geosynthetic Interaction under
Small Displacements Conditions
Zornberg
J.G.,
Roodi G.H., Gupta
R. and Ferreira J.
USA
A mathematical model with a new parameter, defined as “Stiffness of
Soil-Geosynthetic Interaction” or K
SGI
, was introduced to address soil-
geosynthetic interaction behavior under small displacements.
Pull out tests with geosynthetics embedded in poorly graded sand were
conducted to evaluate the proposed model.
Table 6. Numerical Modeling
Title of Paper
Authors
Country
Summary of Main Contribution
Analysis of the influence of soft
soil depth on the subgrade
capacity for flexible pavements.
Carvajal E. and
Romana M.
Spain
Presented the analyses of a flexible pavement structure founded on soft
soil subgrade, through the FEM of a multilayered system.
Deep ground treatments should be applied to achieve an allowable
capacity of soft soils up to minimum depth of about 6 m, otherwise
maintenance cost of pavements might be excessive.
Long-term
performance
of
preloaded road embankment
Islam
M.N.,
Gnanendran C.T.,
Sivakumar S.T.,
Karim M.R.
Australia
Investigated the long-term performance of the preloaded Nerang-
Broadbeach Roadway (NBR) embankment near the Gold Coast in
Queensland (Australia).
The MCC model under-predicted the ultimate settlement while the
creep-based EVP model captured it well but over-predicted the pore
pressure response.
The modified calculation of the Asaoka method predicted almost
identical magnitudes of ultimate settlement as the Hyperbolic method
and FEAs.
Stability improvement methods
for soft clays in a railway
environment
Mansikkamäki J.
and Länsivaara T.
Finland
This paper introduces an evaluation of alternative methods to improve
embankment stability with wooden pile structures or with sheet pile
walls.
Based on the 2D and 3D finite element analysis and to the soil behavior
calibrated in the failure test and existing, they highlighted that analysed
railway embankments are under poor stability conditions.
Probabilistic Settlement Analysis
For The Botlek Lifting Bridge
Jacobse J.A., Nehal
R.S., Rijneveld B.
Netherlands Presented the deformation analysis, deterministic 3D FEM calculations,
on a lifting bridge constructed across the river Oude Maas in the
