Effects of gradation on engineering properties of compacted laterite soil liner
Thesis (PhD. (Civil Engineering))
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| Format: | Thesis |
| Language: | English |
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Universiti Teknologi Malaysia
2023
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| Online Access: | http://openscience.utm.my/handle/123456789/735 |
| _version_ | 1825623471507374080 |
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| author | Yamusa, Yamusa Bello |
| author_facet | Yamusa, Yamusa Bello |
| author_sort | Yamusa, Yamusa Bello |
| collection | OpenScience |
| description | Thesis (PhD. (Civil Engineering)) |
| first_indexed | 2024-03-05T17:34:40Z |
| format | Thesis |
| id | oai:openscience.utm.my:123456789/735 |
| institution | Universiti Teknologi Malaysia - OpenScience |
| language | English |
| last_indexed | 2024-03-05T17:34:40Z |
| publishDate | 2023 |
| publisher | Universiti Teknologi Malaysia |
| record_format | dspace |
| spelling | oai:openscience.utm.my:123456789/7352023-09-11T09:00:42Z Effects of gradation on engineering properties of compacted laterite soil liner Yamusa, Yamusa Bello Shear strength of soils Soil permeability Laterite Thesis (PhD. (Civil Engineering)) Most regulatory agencies and researchers specify minimum criterion of 30% fines content in the design of compacted soil liners to fulfill hydraulic conductivity requirement of less than 1 × 10-9 m/s. At this percentage requirement, laterite soils are vulnerable to leachate permeation which will contaminate the groundwater. Therefore, this research aims to determine the effects of gradation on engineering properties of laterite soil with respect to hydraulic conductivity (k), volumetric shrinkage strain (VSS), and unconfined compressive strength (UCS). In order to satisfy the regulatory requirements of k = 1 x 10-9 m/s, VSS = 4% and UCS = 200 kN/m2, tests were carried out on natural soil L1 (30% fine) and two reconstituted soil samples namely L2 (40% fine) and L3 (50% fine) by adopting the British Standard 1377:1990. Among the properties investigated were particle size distribution, Atterberg limits, compaction behaviour, hydraulic conductivity, unconfined compressive strength, and volumetric shrinkage. Each sample from each gradation was compacted at -4%, -2%, 0%, +2%, +4% moulding water contents relative to the optimum moisture content (OMC) using the British Standard light compaction. Generally, the k values decreased with increase in moulding water content and fines content. On the wet side of OMC (+4%), it provided the most suitable k values which decreased from 1.55 x 10-7 m/s to 1.02 x 10-9 m/s with increasing fines content from 30% to 50%. Meanwhile, the VSS values increased with increase in moulding water content and fines content. On the dry side of OMC (-4%) in which the low values of VSS were obtained, the values increased from 2.71% to 2.98% when the fines content was increased from 30% to 50%. In another criterion, the UCS values decreased with increase in moulding water content but increased with increase in fines content. The highest UCS values were obtained on the dry side of OMC (-4%), where UCS values increased from 245 kN/m2 to 318 kN/m2 with increasing fines content from 30% to 50%. Based on the laboratory experimentation, a minimum fines content of 50% must be achieved to fulfill the requirements in terms of hydraulic conductivity, shear strength and volumetric shrinkage. Besides, computer modeling through digital image technique (Surfer and Matlab) and groundwater model (PetraSim) were used to visualize the leachate flow and validate the laboratory experimentation. The findings from the modeling predicted the migration of leachate through the compacted laterite soil liner in 50 years to be 6 x 10-10 m/s with a final 39 mm migration. The numerical modeling validation showed that there is a close agreement between the laboratory and computer modeling indicating that PetraSim software can be employed to predict migration of leachate through compacted laterite soil liner. It is anticipated that the results of this research can be used as a guide for designing sustainable compacted laterite soils as hydraulic barriers to contaminants in tropical countries. Faculty of Engineering - School of Civil Engineering 2023-09-11T00:09:15Z 2023-09-11T00:09:15Z 2018 Thesis Dataset http://openscience.utm.my/handle/123456789/735 en application/pdf application/pdf application/pdf application/pdf Universiti Teknologi Malaysia |
| spellingShingle | Shear strength of soils Soil permeability Laterite Yamusa, Yamusa Bello Effects of gradation on engineering properties of compacted laterite soil liner |
| title | Effects of gradation on engineering properties of compacted laterite soil liner |
| title_full | Effects of gradation on engineering properties of compacted laterite soil liner |
| title_fullStr | Effects of gradation on engineering properties of compacted laterite soil liner |
| title_full_unstemmed | Effects of gradation on engineering properties of compacted laterite soil liner |
| title_short | Effects of gradation on engineering properties of compacted laterite soil liner |
| title_sort | effects of gradation on engineering properties of compacted laterite soil liner |
| topic | Shear strength of soils Soil permeability Laterite |
| url | http://openscience.utm.my/handle/123456789/735 |
| work_keys_str_mv | AT yamusayamusabello effectsofgradationonengineeringpropertiesofcompactedlateritesoilliner |