Energy approach to unsaturated cyclic strength of sand

Okur, Volkan; Umu, Seyfettin Umut

doi:10.1007/s10518-012-9396-1

Cited by 4 publications

(1 citation statement)

References 35 publications

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“…It is clear that the proposed equation can simulate the cumulated plastic strains during loading-unloading cycles and also that the yielding stress is increased, as expected, after the soil was subjected to cyclic loading. This kind of behavior was experimentally reported for many saturated and unsaturated soils ( 57–64 ). For the second sample, subjected to cycles of wetting and drying, the initial void ratio is assumed to be 0.375 ( v 0 = 1 . 375 ) and the initial mean net stress and matric suction are p i = 0 . 01 MPa and s i = 0 . 80 MPa .…”

Section: Model Validation: Typical Features Of Predicted Behaviorsupporting

confidence: 74%

Modified State Surface Approach to Study Unsaturated Soil Hysteresis Behavior

Riad

Zhang

2020

Transportation Research Record: Journal of the Transportation R

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Unsaturated soils are often used as a construction material in transportation infrastructures. In this situation, unsaturated soils are subjected to cyclic mechanical loading from traffic loads or wetting-drying cycles in seasonal climatic conditions. While mechanical hysteresis is a common feature of soils in general, hydraulic hysteresis is associated with unsaturated soils. Although several constitutive models for unsaturated soils have been proposed, the mechanical and hydraulic hysteresis behavior of unsaturated soils has been little studied. A modified state surface approach (MSSA) was first proposed for investigating the mechanical behavior of unsaturated soils. It was then extended to study the coupled hydro-mechanical behavior of unsaturated soils with a special focus on the consistency between different soil phases. However, hydraulic and mechanical hysteresis were neglected in MSSA formulations. In this paper, based on evidence from experimental results, the MSSA is extended further to study the coupled hydro-mechanical hysteresis behavior of unsaturated soils. The extended MSSA can reproduce several forms of mechanical and hydraulic behavior observed in experimental results that cannot be represented by existing constitutive models. To demonstrate the capabilities of the extended MSSA, typical behaviors are simulated and compared, qualitatively, with the characteristic trends of the behavior of unsaturated soils. Experimental results from the literature are then used to evaluate the model to predict, quantitatively, the observed behaviors. The agreement between measured and predicted results is considered satisfactory and confirms the possibility of the proposed approach to reproduce the hysteresis behavior of unsaturated soils.

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