Abstract
The Modified Cam Clay model is extended to account for the behaviour of unsaturated soils using Bishop’s stress. To describe the Loading – Collapse behaviour, the model incorporates a compressibility framework with suction and degree of saturation dependent compression lines. For simplicity, the present paper describes the model in the triaxial stress space with characteristic simulations of constant suction compression and triaxial tests, as well as wetting tests. The model reproduces an evolving post yield compressibility under constant suction compression, and thus, can adequately describe a maximum of collapse.
Highlights
This paper presents a simple constitutive model for the numerical analyses of unsaturated soils
It incorporates a Loading – Collapse (LC) Surface, derived on the bases of a compressibility framework proposed by the authors [1]
In the last few years, many researches proposed that the slope (i.e., [2]) and/or the position (i.e., [3]) of the unsaturated compression lines in the Bishop’s stress domain can be solely dependent on degree of saturation with suction only implicitly influencing the behaviour through the Water Retention Curve and Bishop stress
Summary
This paper presents a simple constitutive model for the numerical analyses of unsaturated soils. The proposed model is an extension of the Modified Cam Clay (MCC), in the unsaturated regime. It incorporates a Loading – Collapse (LC) Surface, derived on the bases of a compressibility framework proposed by the authors [1]. The utilized framework includes compression lines that are both dependent on suction (s) and on the effective (macro-structural) degree of saturation ( Sre ). This double dependence allows for a comprehensive description of an evolving compressibility during constant suction tests
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