University of Khartoum

Mineralogical Analysis and Investigation of Design Methods for Foundations in Expansive Clay with Particular Reference to Local Soil in Sudan

Mineralogical Analysis and Investigation of Design Methods for Foundations in Expansive Clay with Particular Reference to Local Soil in Sudan

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Title: Mineralogical Analysis and Investigation of Design Methods for Foundations in Expansive Clay with Particular Reference to Local Soil in Sudan
Author: Elshiekh omer, Mahgoub
Abstract: In practice, soils are often classified according to their grain size distribution. The fraction with particle size less then 2µ (2 micron) is identified as clay. In the last twenty or thirty years it has been felt that such a general classification is vague and usually leads to some confusion especially among structural engineers, who are engaged in foundation design. Extensive research especially in the ceramics industry, initiated a good relation between the Atterberg Limits and the mineralogical structure of clay. Chapter I deals with the procedure put forward by Keeling. This is studied in conjunction with the more sophisticated methods, namely the X-ray Diffraction and Differential Thermal Analysis (D. T .A.). Following on from this preliminary investigation, attention is then focussed on: (a) Ascertaining that Keeling, s already established I.L./M.A. curve regarding Kaolinite and Illite identification is sound and can be adopted for local soils. (b) Extending Keeling's curve to identify montnorillonite and highly expansive groups. (c) Comparing results obtained from (a) and (b) with X-ray Diffraction and D. T .A. a reasonable agreement has been assured for a number of soils selected from typical expansive clay areas in Sudan. (d) Carrying out the Atterberg Limits (Index tests) on a variety of expansive clay soils with a view to correlating their mineralogical composition with those given by Gris (Appendix 4). Both methods accord within the usually accepted standard of accuracy in experimental results. Chapter II covers the design of expansived clay foundations. Methods adopted in practice are briefly reviewed with special emphasis on short piles. In the last two decades, this type of foundation has been widely used as an alternative for a cheap and more reliable foundation, especially in light buildings. The determination of the bearing power of this type of pile is investigated and theoretical and experimental results are presented. Chapter III, the results are discussed end conclusions are drawn which may be referred to by practicing engineers for guidance.
URI: http://khartoumspace.uofk.edu/handle/123456789/13815
Date: 2015-06-22


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