Unsaturated Soil Properties of Intact Samples of Ankara Clay

Date

2024-6-12

Author

Maham, Basharat

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The city of Ankara is home to predominantly clays which are highly plastic, very stiff and fissured. Moreover, water table is encountered at a depth of 15m. This essentially means that the prevalent soil of Ankara is unsaturated clay. The behavior of unsaturated soils is quite different than that of saturated soils, mainly due to the influence of suction. For this reason, it is imperative that the behavior of Ankara soils be studied in detail under various modes of stress and suction loadings. This study investigates the unsaturated behavior of Ankara clay subject to various loadings at various degrees of saturation. Samples were collected from all over the region and tests were performed to determine their crucial properties as well as behavior. The results of the tests demonstrate the high values of suction Ankara clay can have even when fully saturated (~38 MPa). They also provide insight into the unexpectedly low increase in shear and compressive strength with a decrease in the degree of saturation. Finally, an attempt to model the behavior of Ankara clay using the Barcelona Basic Model (BBM) was carried out. Results of the calibration prove that BBM fails to accurately capture the brittle behavior of Ankara clay at high suctions.

Subject Keywords

Unsaturated Clay, Undisturbed Sample, Stiff Clay, CW Testing

URI

https://hdl.handle.net/11511/110387

Collections

Graduate School of Natural and Applied Sciences, Thesis