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Effects of Humidity on the Time-Dependent Behaviour of Geomaterials
Geomaterials present a mechanical behaviour with a more or less pronounced time dependency. This sensitivity to time effects encompasses creep and effects of strain rate and its changes. This time dependent behaviour of geomaterials is affected by humidity, and also by humidity changes. In this paper, these effects are first reviewed, with an emphasis put on a series of experiments on chalk saturated by different fluids or pairs of fluids. The main observation is that less humidity implies less creep and a smaller sensitivity of the mechanical behaviour to strain rates effects. A constitutive model accounting for saturation level and time effects is then developed in the framework of elastoplasticity, at the macroscopic scale. The constitutive laws for the description of the time-dependent mechanical behaviour generalise the isotach concept to partially saturated states. It is shown that the model can predict creep or relaxation of geomaterials, when the applied load is close to the elastic limit. Finally, numerical predictions by the proposed model are compared with available experimental results on saturated and partially saturated chalk. It is shown that the model can capture satisfactorily creep and strain rate effects on the mechanical response of this soft rock at various water saturation states.
Effects of Humidity on the Time-Dependent Behaviour of Geomaterials
Geomaterials present a mechanical behaviour with a more or less pronounced time dependency. This sensitivity to time effects encompasses creep and effects of strain rate and its changes. This time dependent behaviour of geomaterials is affected by humidity, and also by humidity changes. In this paper, these effects are first reviewed, with an emphasis put on a series of experiments on chalk saturated by different fluids or pairs of fluids. The main observation is that less humidity implies less creep and a smaller sensitivity of the mechanical behaviour to strain rates effects. A constitutive model accounting for saturation level and time effects is then developed in the framework of elastoplasticity, at the macroscopic scale. The constitutive laws for the description of the time-dependent mechanical behaviour generalise the isotach concept to partially saturated states. It is shown that the model can predict creep or relaxation of geomaterials, when the applied load is close to the elastic limit. Finally, numerical predictions by the proposed model are compared with available experimental results on saturated and partially saturated chalk. It is shown that the model can capture satisfactorily creep and strain rate effects on the mechanical response of this soft rock at various water saturation states.
Effects of Humidity on the Time-Dependent Behaviour of Geomaterials
Pereira, J. M. (author) / De Gennaro, V. (author)
10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures ; 2015 ; Vienna, Austria
CONCREEP 10 ; 332-338
2015-09-18
Conference paper
Electronic Resource
English
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