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Accueil du site → Doctorat → Royaume-Uni → 1993 → The characteristics of expansive soils and rocks in northern Oman

University of Strathclyde (1993)

The characteristics of expansive soils and rocks in northern Oman

Al-Rawas, A.A.A

Titre : The characteristics of expansive soils and rocks in northern Oman

Auteur : Al-Rawas, A.A.A

Université de soutenance : University of Strathclyde

Grade : Doctor of Philosophy (PhD) 1993

The objective of this thesis is to investigate the characteristics of expansive soils and rocks from Northern Oman. A comprehensive study was undertaken on relatively undisturbed samples collected from three sites where expansive soil and rock problems were evident. These sites are at Al-Khod (Sultan Qaboos University), Al-Murtafa’a (Muaskar Al-Murtafa’a) and Duqm. The geology of Northern Oman favours the formation of the swelling clay minerals which cause ground heave and consequently damage to structures. The climate is arid with evaporation rates higher than the annual rainfall. Basic and ultrabasic igneous rocks which are thought to be the main source for the formation of swelling clay minerals are well represented in the region by the widespread exposure of Semail Ophiolite. Within the Tertiary conglomerates of the region, swelling clay minerals have resulted from the in situ weathering and alteration of ultrabasic clasts. In contrast, within the fine grained mudstones and argillaceous limestones, swelling clay minerals appear to have originated at the time of deposition. The geotechnical investigations undertaken indicate that the main type of swelling clay mineral is smectite within Bentonitic Mudstones, Marls and Silty Mudstones, Argillaceous Dolomite Limestone, Altered Conglomerates and Desert Fill derived from these materials. These materials, except the desert fill, tend to form impersistent bands within mainly Tertiary conglomerates and limestones. Geotechnical data were collected from 44 sites in Northern Oman. These data are used to classify broadly the likely swelling potential of the regional materials and to produce a tentative hazard map which shows the geographical distribution of these materials. According to the empirical relationships used for the classification of their swelling potential, the samples collected from these sites generally have a high swelling potential.

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