A study on geotechnical behavior of stabilized peat soil with finite element modeling

(!eat or highly organic soils are well known for their high compressibility, natural moisture content, low shear strength and long-term settlement. Yet, Sarawak has the largest peat land area in Malaysia which is about 16,500 km2 or 13 % of the state land. There is very little data available from...

Full description

Saved in:

Bibliographic Details
Main Author:	Sii, Hee Yew
Format:	Thesis
Language:	English
Published:	2012
Subjects:	GE Environmental Sciences
Online Access:	http://ir.unimas.my/id/eprint/13964/1/Sii%20Hee%20Yew.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-unimas-ir.13964
record_format	uketd_dc
spelling	my-unimas-ir.139642023-08-04T03:24:09Z A study on geotechnical behavior of stabilized peat soil with finite element modeling 2012 Sii, Hee Yew GE Environmental Sciences (!eat or highly organic soils are well known for their high compressibility, natural moisture content, low shear strength and long-term settlement. Yet, Sarawak has the largest peat land area in Malaysia which is about 16,500 km2 or 13 % of the state land. There is very little data available from Sarawak regarding the geotechnical properties and behavior of local peat. In addition, the sampling of peat in undisturbed state is extremely difficult particularly at depths below the watertab~ In the current study of Sarawak peat an undisturbed peat sampler was designed and the sampling was executed in such a way that disturbance could be minimized. Peat samples were collected from Matang area of Sarawak. The effect of stabilizing natural peat with locally available ingredient, pond ash, was also explored. Pond ash is created from the disposal of fly ash. The wet disposal of fly ash into an ash pond is the most common fly ash disposal method. The compressibility characteristics of local undisturbed peat soil are examined through oedometer and Rowe cell testing of undisturbed samples. The experimental results were compared with available published data on Malaysian peat. The material parameters obtained from experiments were used to perform a finite element analysis (PLAXIS) of shallow foundations placed on deposits of Sarawak peat soil. Three depths of peat layers, typically found in Sibu area of Sarawak were considered. The effect of stabilization was modelled by using a stability ratio (the normalized depth of stabilized layer using layer thickness) of 0, 0.25, 0.50, 0.75 and l.O. The model reveals that the use of pond ash in peat stabilization can significantly increase the soil bearing capacity. The results revealed that the stabilization was very significant at the very beginning of 2S % of peat depth. It was apparent that the working load of stabilized peat increased by 21 %, 28 % and 27 % in all 3 m, 7 m and 10m peat with a PA dosage of 2S8 kg/m3 for 2S % of peat depth. Furthermore, the use of PA in soil stabilization helps in reducing the pond volume and achieving an environmental-friendly as well as a sustainable development of natural resources. Universiti Malaysia Sarawak, (UNIMAS) 2012 Thesis http://ir.unimas.my/id/eprint/13964/ http://ir.unimas.my/id/eprint/13964/1/Sii%20Hee%20Yew.pdf text en validuser masters Universiti Malaysia Sarawak, (UNIMAS) Faculty of Engineering
institution	Universiti Malaysia Sarawak
collection	UNIMAS Institutional Repository
language	English
topic	GE Environmental Sciences
spellingShingle	GE Environmental Sciences Sii, Hee Yew A study on geotechnical behavior of stabilized peat soil with finite element modeling
description	(!eat or highly organic soils are well known for their high compressibility, natural moisture content, low shear strength and long-term settlement. Yet, Sarawak has the largest peat land area in Malaysia which is about 16,500 km2 or 13 % of the state land. There is very little data available from Sarawak regarding the geotechnical properties and behavior of local peat. In addition, the sampling of peat in undisturbed state is extremely difficult particularly at depths below the watertab~ In the current study of Sarawak peat an undisturbed peat sampler was designed and the sampling was executed in such a way that disturbance could be minimized. Peat samples were collected from Matang area of Sarawak. The effect of stabilizing natural peat with locally available ingredient, pond ash, was also explored. Pond ash is created from the disposal of fly ash. The wet disposal of fly ash into an ash pond is the most common fly ash disposal method. The compressibility characteristics of local undisturbed peat soil are examined through oedometer and Rowe cell testing of undisturbed samples. The experimental results were compared with available published data on Malaysian peat. The material parameters obtained from experiments were used to perform a finite element analysis (PLAXIS) of shallow foundations placed on deposits of Sarawak peat soil. Three depths of peat layers, typically found in Sibu area of Sarawak were considered. The effect of stabilization was modelled by using a stability ratio (the normalized depth of stabilized layer using layer thickness) of 0, 0.25, 0.50, 0.75 and l.O. The model reveals that the use of pond ash in peat stabilization can significantly increase the soil bearing capacity. The results revealed that the stabilization was very significant at the very beginning of 2S % of peat depth. It was apparent that the working load of stabilized peat increased by 21 %, 28 % and 27 % in all 3 m, 7 m and 10m peat with a PA dosage of 2S8 kg/m3 for 2S % of peat depth. Furthermore, the use of PA in soil stabilization helps in reducing the pond volume and achieving an environmental-friendly as well as a sustainable development of natural resources.
format	Thesis
qualification_level	Master's degree
author	Sii, Hee Yew
author_facet	Sii, Hee Yew
author_sort	Sii, Hee Yew
title	A study on geotechnical behavior of stabilized peat soil with finite element modeling
title_short	A study on geotechnical behavior of stabilized peat soil with finite element modeling
title_full	A study on geotechnical behavior of stabilized peat soil with finite element modeling
title_fullStr	A study on geotechnical behavior of stabilized peat soil with finite element modeling
title_full_unstemmed	A study on geotechnical behavior of stabilized peat soil with finite element modeling
title_sort	study on geotechnical behavior of stabilized peat soil with finite element modeling
granting_institution	Universiti Malaysia Sarawak, (UNIMAS)
granting_department	Faculty of Engineering
publishDate	2012
url	http://ir.unimas.my/id/eprint/13964/1/Sii%20Hee%20Yew.pdf
_version_	1783728143473836032

A study on geotechnical behavior of stabilized peat soil with finite element modeling

Similar Items