Instrumented physical model studies of the peat soil-engineering structure interaction
The engineering structures are mostly constructed directly in contact with the ground and the response between the soil and the structure is termed as soil-engineering structure interaction. To understand the interaction, physical modelling is considered as a prime method of study. This physic...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/2128/1/24p%20SITI%20NOORAIIN%20MOHD%20RAZALI.pdf http://eprints.uthm.edu.my/2128/2/SITI%20NOORAIIN%20MOHD%20RAZALI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2128/3/SITI%20NOORAIIN%20MOHD%20RAZALI%20WATERMARK.pdf http://eprints.uthm.edu.my/2128/ |
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| Summary: | The engineering structures are mostly constructed directly in contact with the ground
and the response between the soil and the structure is termed as soil-engineering
structure interaction. To understand the interaction, physical modelling is considered as
a prime method of study. This physical model study has been conducted on peat soils
obtained from the Malaysian Agricultural Research and Development Institute�Integrated Peat Research Station (MARDI-IPRS) in Pontian, Johor. Peat is considered
as unsuitable soil for supporting foundations in its natural state due to the high moisture
content (>100%), high compressibility (0.9-1.5) and low shear strength (5-20 kPa)
values. Peat also contains high organic matter (>75%), large deformation, high
compressibility and high magnitude and rates of creep. The objectives of this study are
to identify the engineering characteristic of the peat, analyse the deformation behaviour
in peat soil based on physical modelling, analyse using physical model the stress
distribution beneath the structure in peat soil and to compare the peat behaviour with
sand. The reason of comparing these two different types of soil was to obtain the
significant difference in terms of the settlement, stress and failure pattern. This study
also helps to acquire basic understanding of the behaviour of settlement and stress of
peat soil when load is applied to it. The rectangular model and the square model were
used in pre-model study (PMS) to identify suitable indicators and observed the
deformation of the peat/sand after the loading process. Meanwhile, a plane strain model
cm was used in plain strain study (PSS) with instrumentations (Displacement
Transducers and Soil Pressure Gauge) to investigate and observed the settlement and
stress on the peat/sand. Various static loads were applied at the surface and the
interaction between peat soil and sand with the structure was recorded based on all the
deformations and stresses at various positions and levels. The water level was
maintained at a constant level that is at the surface of the soil to prevent any induce
stress due to the seepage of water and to omit settlement due to the lowering of the
water table. The observations showed that the settlement in peat was higher compared to
the settlement in sand because of the properties of peat that highly compressible
compared to sand. The deformation of sand corresponds to general bearing capacity
failure and deformation in peat shows punching shear failure. However, the stress in the
sand was higher than the stress in peat because of the presence of water that affects the
value of stress in peat. |
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