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Composite foundations on Malaysian soft clay soil: applications of innovative techniques

An innovative technique of electro osmosis coupled with vertical surcharge loading to accelerate the consolidation and stiffen Kaolin (China Clay Grade E) was investigated in this study. The geotechnical properties of this China Clay Kaolin Grade E and the design of electro osmotic consolidati...

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Main Author: Mohd Yusof, Khairul Nizar
Format: Thesis
Language:English
Published: 2012
Subjects:
TA Engineering (General). Civil engineering (General)
TA703-712 Engineering geology. Rock mechanics. Soil mechanics.
Online Access:http://eprints.uthm.edu.my/2541/1/24p%20KHAIRUL%20NIZAR%20MOHD%20YUSOF.pdf
http://eprints.uthm.edu.my/2541/
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spelling my.uthm.eprints.25412021-11-01T02:37:17Z http://eprints.uthm.edu.my/2541/ Composite foundations on Malaysian soft clay soil: applications of innovative techniques Mohd Yusof, Khairul Nizar TA Engineering (General). Civil engineering (General) TA703-712 Engineering geology. Rock mechanics. Soil mechanics. An innovative technique of electro osmosis coupled with vertical surcharge loading to accelerate the consolidation and stiffen Kaolin (China Clay Grade E) was investigated in this study. The geotechnical properties of this China Clay Kaolin Grade E and the design of electro osmotic consolidation chamber are discussed together with an explanation of the procedural concept of the electro osmotic consolidation chamber (i.e., the preparation of the apparatus and the clay sample, assembling of the electro osmotic consolidation chamber; and the experimental work). The plastic limit, liquid limit and plasticity index were 35%, 53% and 18% respectively. Therefore, China Clay Kaolin Grade E is classified as MH soil, and it is predominantly a silt with high plasticity. The specific gravity of the soil is 2.65. To ensure the kaolin is saturated, all samples were prepared in a similar manner with deaired water to produce a slurry at 150% of the liquid limit (initial moisture content of 79.5%). The electro osmotic consolidation chamber was cylindrical and consisted of the body, the base and the top cap. The body and the base of the chamber were constructed of polyvinyl chloride (PVC) tube with a wall thickness of 10.9 mm, 345 mm high and 251 mm inner diameter. The electro osmotic consolidation chamber was assembled together with a 45 mm thick flange and collar. The top cap of this chamber was based on that of a Rowe cell of similar diameter. Twenty one tests were performed in this study with an applied voltage and one test was a control test. The test samples in the twenty one tests were all consolidated to three different phases. In Phases 1 and 2, the samples were consolidated at 15 kPa while in the Phase 3, 50 kPa was used. The electro osmotic process was only performed during Phase 2. The time of treatment, numbers of electrodes, the arrangement of electrodes, and the applied voltages were investigated in these tests. Results from these tests indicated that the China Clay Kaolin Grade E in a 79.5% slurry form responded well to electro osmotic treatment and that electro osmotic process increased the overall stiffness of the soil as indicated by the reduced relative settlement in Phase 3 with a pressure of 50kPa. The water content around the anodes was less than that at the cathode creating zones of higher average constrained stiffness. The tests demonstrated that the longer the time of treatment, the greater the numbers of anodes, the shorter distance between the electrodes and the higher the applied voltages associated with electro osmosis increased the average stiffness of the soil mass confirming the concept of an electro osmotic pile. Keywords: electro osmotic merged vertical loading and electro osmotic, consolidation, electro osmotic consolidation chamber, stiffening. 2012 Thesis NonPeerReviewed text en http://eprints.uthm.edu.my/2541/1/24p%20KHAIRUL%20NIZAR%20MOHD%20YUSOF.pdf Mohd Yusof, Khairul Nizar (2012) Composite foundations on Malaysian soft clay soil: applications of innovative techniques. Doctoral thesis, The University of Leeds.
institution Universiti Tun Hussein Onn Malaysia
building UTHM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tun Hussein Onn Malaysia
content_source UTHM Institutional Repository
url_provider http://eprints.uthm.edu.my/
language English
topic TA Engineering (General). Civil engineering (General)
TA703-712 Engineering geology. Rock mechanics. Soil mechanics.
spellingShingle TA Engineering (General). Civil engineering (General)
TA703-712 Engineering geology. Rock mechanics. Soil mechanics.
Mohd Yusof, Khairul Nizar
Composite foundations on Malaysian soft clay soil: applications of innovative techniques
description An innovative technique of electro osmosis coupled with vertical surcharge loading to accelerate the consolidation and stiffen Kaolin (China Clay Grade E) was investigated in this study. The geotechnical properties of this China Clay Kaolin Grade E and the design of electro osmotic consolidation chamber are discussed together with an explanation of the procedural concept of the electro osmotic consolidation chamber (i.e., the preparation of the apparatus and the clay sample, assembling of the electro osmotic consolidation chamber; and the experimental work). The plastic limit, liquid limit and plasticity index were 35%, 53% and 18% respectively. Therefore, China Clay Kaolin Grade E is classified as MH soil, and it is predominantly a silt with high plasticity. The specific gravity of the soil is 2.65. To ensure the kaolin is saturated, all samples were prepared in a similar manner with deaired water to produce a slurry at 150% of the liquid limit (initial moisture content of 79.5%). The electro osmotic consolidation chamber was cylindrical and consisted of the body, the base and the top cap. The body and the base of the chamber were constructed of polyvinyl chloride (PVC) tube with a wall thickness of 10.9 mm, 345 mm high and 251 mm inner diameter. The electro osmotic consolidation chamber was assembled together with a 45 mm thick flange and collar. The top cap of this chamber was based on that of a Rowe cell of similar diameter. Twenty one tests were performed in this study with an applied voltage and one test was a control test. The test samples in the twenty one tests were all consolidated to three different phases. In Phases 1 and 2, the samples were consolidated at 15 kPa while in the Phase 3, 50 kPa was used. The electro osmotic process was only performed during Phase 2. The time of treatment, numbers of electrodes, the arrangement of electrodes, and the applied voltages were investigated in these tests. Results from these tests indicated that the China Clay Kaolin Grade E in a 79.5% slurry form responded well to electro osmotic treatment and that electro osmotic process increased the overall stiffness of the soil as indicated by the reduced relative settlement in Phase 3 with a pressure of 50kPa. The water content around the anodes was less than that at the cathode creating zones of higher average constrained stiffness. The tests demonstrated that the longer the time of treatment, the greater the numbers of anodes, the shorter distance between the electrodes and the higher the applied voltages associated with electro osmosis increased the average stiffness of the soil mass confirming the concept of an electro osmotic pile. Keywords: electro osmotic merged vertical loading and electro osmotic, consolidation, electro osmotic consolidation chamber, stiffening.
format Thesis
author Mohd Yusof, Khairul Nizar
author_facet Mohd Yusof, Khairul Nizar
author_sort Mohd Yusof, Khairul Nizar
title Composite foundations on Malaysian soft clay soil: applications of innovative techniques
title_short Composite foundations on Malaysian soft clay soil: applications of innovative techniques
title_full Composite foundations on Malaysian soft clay soil: applications of innovative techniques
title_fullStr Composite foundations on Malaysian soft clay soil: applications of innovative techniques
title_full_unstemmed Composite foundations on Malaysian soft clay soil: applications of innovative techniques
title_sort composite foundations on malaysian soft clay soil: applications of innovative techniques
publishDate 2012
url http://eprints.uthm.edu.my/2541/1/24p%20KHAIRUL%20NIZAR%20MOHD%20YUSOF.pdf
http://eprints.uthm.edu.my/2541/
_version_ 1738581004268863488
score 13.211869

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