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Sultan Qaboos University (2021)

Assessment of Expansive Soils in Oman from the Perspective of its Swelling and Suction Properties : Case Studies.

Zainab Bashir Ali Bacal

Titre : Assessment of Expansive Soils in Oman from the Perspective of its Swelling and Suction Properties : Case Studies.

Auteur : Zainab Bashir Ali Bacal

Université de soutenance : Sultan Qaboos University

Grade : Master of Science (MS) 2021

Résumé partiel
Expansive soils cause a major geotechnical and structural engineering challenges around the world. In this study, expansive soils from two locations from Al-Khod and one location from Adam were exposed to some geotechnical experiments. These tests aim to characterize these soils and study the effect of their properties and the compaction properties on the swelling percent, swelling pressure, consolidation-swelling pressure, and suction. The soils were subjected to a laboratory testing program included : wet sieve analysis, hydrometer, Atterberg limits, specific gravity, compaction, swelling percent, swelling pressure, consolidation, filter paper (total and matric suction), pressure plate (matric suction), X-ray fluorescence (XRF), and X-ray diffraction (XRD).

It was found that Al-Khod-1, Al-Khod-2 and Adam soils have percentage of fines (silt and clay) of around 99.3, 50.7 and 59%, respectively, and amount of clay of around 51, 5.4 and 26%, respectively. The specific gravity of Al-Khod-1, Al-Khod-2, and Adam soils was calculated to be 2.64, 2.62, and 2.70, respectively. Moreover, Al-Khod-1 and Adam soils were classified as an inorganic clay with high plasticity, while Al-Khod-2 soil was classified as an inorganic clay with low plasticity. At the optimum water content and the maximum dry density, Al-Khod-1 soil exhibits high swelling potential which is 4.5% and swelling pressure of about 13.5 kPa, while Al-Khod-2 soil exhibits medium swelling potential which is 1.48% and swelling pressure of about 10.7 kPa. Moreover, Adam soil exhibits high swelling potential which is 11.2% and swelling pressure of about 89 kPa. Based on the modified compression indices form the consolidation tests, Al-Khod-1 soil has more tendency to consolidate compared with Al-Khod-2 soil. At the optimum water content and the maximum dry density, the total and matric suctions for Al-Khod-1 soil were found to be 2452 kPa and 5663 kPa, respectively, while for Al-Khod-2 soil the suctions at the optimum water content and the maximum dry density were found to be 482 kPa and 709 kPa for matric and total suctions, respectively. Moreover, the suctions at the optimum water content and the maximum dry density for Adam soil were found to be 2027 kPa and 5302 kPa for matric and total suctions, respectively. By XRF test, it was found that AlKhod-1 and Adam soils contain a high percentage of SiO2, Al2O3, CaO and Fe2O3

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Page publiée le 20 avril 2022