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Technical Committee 202 /
Comité technique 202
6 ANNEXURE - TABLE 2-7: SUMMARY OF ALL CONTRIBUTIONS IN DISCUSSION SESSION
Table 2. Compaction and subgrade improvement for transport infrastructure
Title of Paper
Authors
Country
Summary of Main Contribution
Five years of Impact Compaction
in
Europe
–
successful
implementation of an innovative
compaction technique based on
fundamental research and field
experiments
Adam
D.,
Paulmichl
I.,
Adam, C. and
Falkner F.J.
Austria
The impact compaction methods are more efficient if greater depths of
densification are of interest.
Key aspects related to the application of impact compaction such as the
surface velocity, weight and number passes are analyzed both in
numerical simulations and field cases studies. The results are compared
and compaction efficiency is also linked to the type of soil.
Assessing the Effectiveness of
Rolling Dynamic Compaction
Kuo Y.L., Jaksa
M.B., Scott B.T.,
Bradley
A.C.,
Power C.N., Crisp
A.C. and Jiang
J.H.
Australia
The efficiency of rolling dynamic compaction (RDC) is examined by
means of a combination of field studies and numerical modeling
RDC is more effective for depths between 0.8 m to 3.0 m and the most
significant factors governing its efficiency are soil cohesion, Poisson’s
ratio and shear modulus, as well as the width and mass of the RDC
module.
Applicability of the Geogauge, P-
FWD and DCP for compaction
control
Conde M. C.,
Lopes M. G.,
Caldeira L. and
Bilé Serra J.
Portugal
The feasibility of a stiffness-based specification for embankment soil
compaction quality control is discussed.
DCP equipment showed greater suitability as a compaction control
tool, due to the strong negative correlation with water content values.
Ground improvement methods for
the construction of the federal road
B 176 on a new elevated dump in
the brown coal region of MIBRAG
Kirstein J. F.,
Ahner
C.,
Uhlemann
S.,
Uhlich P. and
Röder K.
Germany
The design and the settlements are significantly optimized by the
combination of different soil improvement techniques, particularly in
cases where significant stability problems are expected.
The settlements predictions by Finite element modeling agreed well the
results obtained with in situ pressuremeter tests.
Laboratory characterization and
model calibration of a cemented
aggregate for application in
transportation infrastructures
Viana da Fonseca
A.,
Rios
S.,
Domingues A.M.,
Silva
A.
and
Fortunato E.
Portugal
The differences observed in dynamic and static stiffness properties and
shear strength parameters of compacted mixtures of cement and
limestone aggregate are directly associated to the variation of
porosity/cement ratio.
Hardening soil models may be employed to describe the stress-strain
behavior, but do not provide satisfactory predictions of the volumetric
behavior and post-peak strain softening.
Table 3. Laboratory Testing
Title of Paper
Authors
Country
Summary of Main Contribution
Railways platforms reinforced by
soil-mixing columns without track
removing
Calon N., Robinet
A., Costa S.,
D’Aguiar
L.,
Cojean, B.C. and
Mosser J.F.
France
Investigated the potential benefits from the ground reinforcement by
vertical soil-cement columns
Performed laboratory tests to investigate the influence of the column
location and the efficiency of geosynthetics on the reduction of stiff
zones
With subsequent numerical model, they determined the optimum
columns mesh
Effects of ballast thickness and tie-
tamper repair on settlement
characteristics of railway ballasted
tracks
Hayano K., Ishii
K. and Muramoto
K.
Japan
Conducted a series of cyclic loading tests on model grounds to
investigate the effects of ballast thickness and tie-tamper repair on the
settlement characteristics of ballasted tracks
Maximum shear strain distributions generated in the model grounds
were analyzed with particle image velocimetry
Effect Evaluation of Freeze-Thaw
on Deformation-Strength Properties
of Granular Base Course Material
in Pavement
Ishikawa
T.,
Zhang
Y.,
Kawabata
S.,
Kameyama
S.,
Tokoro T. and
Ono T.
Japan
CBR tests of freeze-thawed subbase course materials under various
water contents, and the resilient modulus tests in unsaturated condition
were conducted using two newly developed test apparatus
The test results were compared with long-term field measurement at a
model pavement structure, including FWD tests
On the Permanent Deformation
Behavior of Rail Road Pond Ash
Subgrade
Mohanty B. and
Chandra S.
India
Repeated load triaxial tests were conducted on reconstituted pond ash
specimens
Permanent deformation calculations take into account the stress history
