Evaluation of innovation lightweight fill in problematic soil
Construction of structures on soft soils gives rise to some difficulties in Malaysia and other country with soft soils, especially in settlement both in short and long term. The most critical geotechnical challenges are excessive settlement and differential settlement leading to hazardous and discom...
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| Format: | Thesis |
| Published: |
2016
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/9069/ http://eprints.uthm.edu.my/9069/1/Reventheran_Ganasan.pdf |
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| Summary: | Construction of structures on soft soils gives rise to some difficulties in Malaysia and
other country with soft soils, especially in settlement both in short and long term.
The most critical geotechnical challenges are excessive settlement and differential
settlement leading to hazardous and discomfort in road usage and distress in
buildings. The focus of this research is to minimize the differential and non-uniform
settlement on peat soil with the use of an innovative cellular mat. The behavior and
performance of the lightweight material (in block form) was investigated and in
particular the use as a fill in embankment on soft ground in both physical and
numerical modelling. Peat soil, sponge and innovative cellular mat were used as
physical modelling where else PLAXIS 2D was selected as the numerical modelling
part whereby both of these modelling act as the main research material in this study.
The initial part of this research (physical modelling) had taken place in monitoring in
settlement behaviour thus it will be only done as laboratory testing. The laboratory
model test was conducted in a steel tank of size 100cm (length) x 50cm (width) and
60cm (height). The bottom, back face and the sides of the tank were made of steel.
The front wall of the test tank was fabricated from a 15mm thick perspex glass plate
to observe failure mechanism. The uneven settlement with problem was uniquely
monitored photographically using spot markers. For the numerical method, the
data/input through past literature review and also through the testing done in peat
from Parit Nipah had been applied in both Mohr Coulomb and Soft Soil constitutive
of models thus comparing the occurrence of settlement behaviour including the
presence of new innovative lightweight material. These physical and numerical
modelling were carried out as to simulate the real problem and case study in Parit
Yaani, Batu Pahat, Johor approaching to the bridge connected with embankment. The mini trial embankment test was built with the innovative cellular mats place
underneath to identify the suitable cover depth thus propose in laying these new
lightweight mats under the embankment surface in the future (real site/field testing).
In the end of the research, the innovative cellular mat have been proven literally in
both physical and numerical modelling in reducing the excessive and differential
settlement up to 50% and 45% respectively compare to the flexible base and rigid
base foundation. This has also improve the stiffness of soils as well as the porous
contain in cellular structure which help in allowing water/moisture to flow through in
or out without condition of floating. |
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