Change search
ReferencesLink to record
Permanent link

Direct link
Geotechnical Aspects of Buildings on Expansive Soils in Kibaha, Tanzania: Preliminary Study
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
2006 (English)Licentiate thesis, monograph (Other scientific)
Abstract [en]

The focus of this study is on potential problems resulting from construction on expansive soils in Kibaha region, Tanzania. For the fact that most of the affected structures are founded on expansive soils, a clear understanding of the soil behaviour and their interaction with structures, specifically as they relate to shallow foundations, has been of more interest to the study in order to evaluate properly the source of the problem.

The geotechnical behaviour of expansive clay soils is investigated by looking into the geomorphologic, geological and climatic conditions and mineralogical composition of the soils in the study area. The geotechnical results are linked with the performance of the foundation as well as structures.

Two sites, representative of known problem-areas in Kibaha were selected for geotechnical tests. Geotechnical site investigation consisted of open trial pits, profile description and the collection of both disturbed and undisturbed samples.

The collected samples were submitted to soil laboratories at KTH and DIT for mineralogical composition tests, natural water content, density, Atterberg limits and swell tests (free swell and swelling pressure). The results of this investigation indicate that soil in Kibaha contains clay (31%), have high liquid limit (59%) and plastic limit (37%) which indicate high potential swell.

Since swell potential and swell pressure are key properties of expansive soils, the swell parameters were measured by free swell tests and one-dimensional oedometer swell tests respectively. The free swell ranged from 100% to 150% and the swell pressure was in the region of 45 kPa.

The properties of expansive soils were confirmed by the x-ray diffraction test which showed the presence of montmorillonite in the soil. It is from this fact that the source of the problem is in the expansive soils coupled with poor building materials.

Physical conditions of the surveyed properties in the area confirmed the hypothesis of building damages due to poor building materials triggered by expansive soils. In support of the obtained data, the actual behaviour of the foundations is supplemented with prototypes of strip foundations whose performances are to be monitored over a long period. Finally, suggested are the ways forward to solve the problem of foundation on expansive soil.

Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , xvi, 130 p.
Trita-JOB. LIC, ISSN 1650-951X ; 2011
Keyword [en]
expansive soils, soil properties, potential swell, Soil-Structure Interaction (SSI), and superstructure and substructure.
National Category
Building Technologies
URN: urn:nbn:se:kth:diva-4056OAI: diva2:10579
2006-06-19, Byggvetenskaps bibliotek, KTH, Brinellvägen 34, Stockholm, 10:00
QC 20101118Available from: 2006-06-16 Created: 2006-06-16 Last updated: 2012-01-14Bibliographically approved

Open Access in DiVA

fulltext(2853 kB)16127 downloads
File information
File name FULLTEXT01.pdfFile size 2853 kBChecksum SHA-1
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Lucian, Charles
By organisation
Soil and Rock Mechanics
Building Technologies

Search outside of DiVA

GoogleGoogle Scholar
Total: 16127 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 5732 hits
ReferencesLink to record
Permanent link

Direct link