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Suction—Resistivity Relationship in Unsaturated Gypseous Soil
Suction pressure and water potential significantly affect the geotechnical and geophysics behavior of the gypseous collapsible soil, especially under unsaturated conditions. Direct measurement for the soil suction still a big challenge due to the limitation of the test equipment, high cost, and time-consuming of the tests. In this study an attempt is made in order to find indirect method for estimating the soil suction in gypseous soil by using geophysics techniques. Soil-Model apparatus provided with highly sensitive Tensiometer, Time Domain Reflectometry, and resistivity sensors is used to investigate the relationship between the matric suction, water content, volume change, and soil resistivity. The unsaturated gypseous soil sample is brought up from Al-Ramadi city, west of Iraq, with a gypsum content of 70%. The test procedure includes different initial conditions such as applied stress and sensors level. The tests results show the soil resistivity sharply decreased with the decrease in matric suction, especially at medium range of soil suction (i.e., 1000–100 kPa), then the relationship will be relatively constant for all measurements levels. Also, the void ratio sharply decreased with the soil suction’s degreasing and became relatively constant at the low range of soil suction (i.e., <100 kPa) at vertical stress of 25 kPa.
Suction—Resistivity Relationship in Unsaturated Gypseous Soil
Suction pressure and water potential significantly affect the geotechnical and geophysics behavior of the gypseous collapsible soil, especially under unsaturated conditions. Direct measurement for the soil suction still a big challenge due to the limitation of the test equipment, high cost, and time-consuming of the tests. In this study an attempt is made in order to find indirect method for estimating the soil suction in gypseous soil by using geophysics techniques. Soil-Model apparatus provided with highly sensitive Tensiometer, Time Domain Reflectometry, and resistivity sensors is used to investigate the relationship between the matric suction, water content, volume change, and soil resistivity. The unsaturated gypseous soil sample is brought up from Al-Ramadi city, west of Iraq, with a gypsum content of 70%. The test procedure includes different initial conditions such as applied stress and sensors level. The tests results show the soil resistivity sharply decreased with the decrease in matric suction, especially at medium range of soil suction (i.e., 1000–100 kPa), then the relationship will be relatively constant for all measurements levels. Also, the void ratio sharply decreased with the soil suction’s degreasing and became relatively constant at the low range of soil suction (i.e., <100 kPa) at vertical stress of 25 kPa.
Suction—Resistivity Relationship in Unsaturated Gypseous Soil
Karkush, Mahdi O. (editor) / Choudhury, Deepankar (editor) / Al-Obaidi, Qasim A. (author) / Al-Shamoosi, Ali A. (author)
Geotechnical Engineering and Sustainable Construction ; Chapter: 10 ; 115-124
2022-03-20
10 pages
Article/Chapter (Book)
Electronic Resource
English
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