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Post cyclic behaviour of Malaysian peat soil

Mohamad, Habib Musa (2015) Post cyclic behaviour of Malaysian peat soil. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

In Malaysia, there are 2.4 million hectares of land covered by peat soil, with 1.5 million hectares available in Sarawak alone. The conversion and draining of peatland for construction, infrastructure, housing and industrial projects has created several maintenance issues that are increasingly appearing on the peat soil. The conventional method that was used to design the roads only considers soil shear strength through static load and does not take into account the vehicular dynamic loading and shear strength thereafter. The purpose of this research is to investigate the engineering properties of peat soils and evaluate the effects of peat soil behaviour under static and dynamic loading. This is also to evaluate and establish the postcyclic undrained behaviour while comparing it to static monotonic stress-strain behaviour. This research is focused on the post-cyclic shear strength of peat soil behaviour characteristics based on cyclic loading and shear strength curves derived from triaxial test under consolidated undrained conditions. Static and post-cyclic monotonic load tests were carried out on peat soil samples from Parit Nipah, Johor (PNpt) and Penor, Pahang (PRpt). 175 specimens were tested, and prepared under effective stresses at 13kPa, 25kPa, 50 kPa, 100 kPa and 200 kPa. Whereas, dynamic load tests were carried out in different frequencies to simulate the loading type such as vibration of machineries, wind, traffic load and earthquake in field from 0.5 Hz, 1.0 Hz, 1.5 Hz and 2.0 Hz with 100 numbers of loading cycles. Post-cyclic monotonic shear strength results as compared to static test showed some significant changes in reduction of stress-strain behaviour. Post-cyclic shear strength decreases with the increase in the frequencies. Averagely, the PRpt has dominantly higher in reduction strength in post-cyclic at 59.24% while PNpt is approximately about 58.72%. Prior to critical yield strain level, the peat specimen experience a significant deformation. The deformation of peats triggers changes in soil structures that causes reduction in stress-strain behaviour. Thus, it can be concluded that the stress-strain behaviour of peat soil decreased after 100 numbers of cyclic loading in post-cyclic test as compared to the static tests, and it decreased substantially when frequencies were applied.

Item Type: Thesis (Masters)
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA703-711 Engineering geology. Rock mechanics. Soil mechanics.
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 22 Feb 2017 10:05
Last Modified: 22 Feb 2017 10:05
URI: http://eprints.uthm.edu.my/id/eprint/8905
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