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COMPORTEMENT HYDROMÉCANIQUE DES SOLS GONFLANTS COMPACTÉS

Abstract : The use of compacted soils in engineering practice is very wide spread, especially in geotechnical and environmental engineering. These soils can be submitted to moisture variations, i.e. suction changes, that induce volumetric deformations. The main objective of this thesis is to study the suction influence on the hydromechanical behaviour of a compacted swelling soil in the range of suction comprised between 0 and 300 MPa.
For this purpose, two kinds of suction controlled oedometers, using the osmotic method or the salt solutions technique, were employed. The salt solutions oedometer were especially developed for this study.
The samples were made with a compacted swelling material. The experimental study has shown that the apparent preconsolidation stress reaches a constant value above a suction of 38.9 MPa. The slope of the plastic compression curve had a maximum value under a suction of 4 MPa. These results seem to be related to the initial internal structure of the samples. Then the influence of complex hydromechanical stress paths was also investigated. It appeared that the results of the tests conducted on a swelling soil depended on the followed stress path even if a wetting is performed during a test. In the last part of this work, the test results were interpreted with the Barcelona Basic Model and Barcelona Expansive Model (BExM). The possibilities of both models were compared. To interpret the test results with the BExM, it is necessary to conduct some additional tests that include a suction cycle and also a constant volume test with a suction controlled wetting.
As a conclusion, two suction controlled experimental devices were developed and validated in this study. With these devices, the influence of structure and suction on the hydromechanical behaviour of a compacted swelling soils was characterised.
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Submitted on : Friday, January 16, 2009 - 11:28:09 AM
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Olivier Cuisinier. COMPORTEMENT HYDROMÉCANIQUE DES SOLS GONFLANTS COMPACTÉS. Sciences de l'ingénieur [physics]. Institut National Polytechnique de Lorraine - INPL, 2002. Français. ⟨tel-00004524⟩

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