Role of Matric Suction on Shear Strength of Unsaturated Compacted Soil at Low Confining Stress
In order to deal with some typical geotechnical problems, such as stability of slopes and bearing capacity of foundations shear strength is considered as a fundamental soil property. The influence of matric suction on shear strength has been recognized and various types of laboratory element tests with suction control or measurement has been performed by many researchers. This study aimed at understanding the role of matric suction on the transformation of shear strength and failure mechanism in unsaturated soil. The method of study was via a series of advanced laboratory element tests of two specific types; (1) constant water content (CW) tests, and (2) fully undrained (FU) tests. The tests were performed using the axis translation technique to measure matric suction. The results indicate that the change in water content has an influence on initial matirc suction. The relationship between matric suction and shear strength is non-leaner, and change in matric suction affects the mechanical behavior of unsaturated soil.
KeywordsUnsaturated soil Shear strength Water content Matric suction
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