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A Study on the Shear Strength Envelope of an Unsaturated Colluvium Soil

Pereira, A. / Feuerharmel, C. / Gehling, W. Y. Y. / Bica, A. V. D.

A conventional triaxial equipment, originally used for testing soil specimens in the saturated condition, was modified in order to allow the testing of specimens in the unsaturated drained condition. In this device, the axis-translation technique is used to avoid cavitation in the pressure measuring system. The volume change in the specimen is determined from the measurement of changes in the volume of the triaxial cell confining fluid. Those tests were carried out using specimens of a colluvium soil of sandstone both in the saturated condition (drained and undrained tests) and in the unsaturated condition. The observed behavior was (i) an increase of shear strength with an increment of matric suction and (ii) the non-linearity of the shear strength envelope after the application of a higher value of matric suction.

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A Study on the Shear Strength Envelope of an Unsaturated Colluvium Soil

Pereira, A. / Feuerharmel, C. / Gehling, W. Y. Y. / Bica, A. V. D.

A conventional triaxial equipment, originally used for testing soil specimens in the saturated condition, was modified in order to allow the testing of specimens in the unsaturated drained condition. In this device, the axis-translation technique is used to avoid cavitation in the pressure measuring system. The volume change in the specimen is determined from the measurement of changes in the volume of the triaxial cell confining fluid. Those tests were carried out using specimens of a colluvium soil of sandstone both in the saturated condition (drained and undrained tests) and in the unsaturated condition. The observed behavior was (i) an increase of shear strength with an increment of matric suction and (ii) the non-linearity of the shear strength envelope after the application of a higher value of matric suction.

A Study on the Shear Strength Envelope of an Unsaturated Colluvium Soil

Pereira, A. / Feuerharmel, C. / Gehling, W. Y. Y. / Bica, A. V. D.

A conventional triaxial equipment, originally used for testing soil specimens in the saturated condition, was modified in order to allow the testing of specimens in the unsaturated drained condition. In this device, the axis-translation technique is used to avoid cavitation in the pressure measuring system. The volume change in the specimen is determined from the measurement of changes in the volume of the triaxial cell confining fluid. Those tests were carried out using specimens of a colluvium soil of sandstone both in the saturated condition (drained and undrained tests) and in the unsaturated condition. The observed behavior was (i) an increase of shear strength with an increment of matric suction and (ii) the non-linearity of the shear strength envelope after the application of a higher value of matric suction.

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Title:

A Study on the Shear Strength Envelope of an Unsaturated Colluvium Soil

Contributors:

Pereira, A. (author) / Feuerharmel, C. (author) / Gehling, W. Y. Y. (author) / Bica, A. V. D. (author)

Conference:

Fourth International Conference on Unsaturated Soils ; 2006 ; Carefree, Arizona, United States

Published in:

Unsaturated Soils 2006 ; 1191-1199

Publication date:

2006-03-17

ISBN:

DOI:

https://doi.org/10.1061/40802(189)97

Type of media:

Conference paper

Type of material:

Electronic Resource

Language:

English

Keywords:

Unsaturated soils , Saturated soils , Soil liquefaction , Shear strength , Soil suction , Building envelope , Foundations , Soil properties

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