Influence of matric suction on shear strength behavior of a residual clayey soil |
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| Authors: | C Kayadelen M A Tekinsoy T Ta?k?ran |
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| Institution: | 1.Department of Civil Engineering,Nigde University,Nigde,Turkey;2.Department of Civil Engineering,?ukurova University,Adana,Turkey;3.Department of Civil Engineering,Dicle University,Diyarbak?r,Turkey |
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| Abstract: | In this paper, the shear strength with respect to the matric suction of unsaturated soils was studied. For this purpose, unsaturated
triaxial testing procedures were applied to the undisturbed residual soil specimens. An apparatus for performing triaxial
tests was designed and constructed. In the tests, matric suction was controlled by using the axis translation technique, and
pore water volume changes were measured by means of a volume change transducer with 10−8 m3 sensitivity. The test results indicated that the matric suction contributes to the shear strength of unsaturated soil specimens,
and this contribution called suction strength varies non-linearly with respect to the matric suction. The logarithmic model
needing to know the air-entry value and the internal friction angle of a soil specimen for prediction of the suction strength
were presented and compared with the test results. It was found that suction strength values predicted from the proposed model
were in satisfactory agreement with the experimental results. |
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| Keywords: | Unsaturated soil Matric suction Shear strength Residual clay |
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