4.4 Article

Unified modeling behavior of rockfill materials along different loading stress paths

Journal

SOILS AND FOUNDATIONS
Volume 62, Issue 3, Pages -

Publisher

JAPANESE GEOTECHNICAL SOC
DOI: 10.1016/j.sandf.2022.101155

Keywords

Rockfill materials; Loading stress path; Generalized plasticity; Dilatancy equation; Tangent modulus

Funding

  1. National Key Research and Development Program of China [2018YFC1508503]
  2. Open Research Fund of MWR Key Lab of Reservoir Dam Safety [YK321011]
  3. Open Research Fund of Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University [2020003]
  4. Special Fund of Chinese Central Government for Basic Scientific Research Operations in Commonweal Research Institutes [Y320004, Y320005]

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Rockfill materials used for dam construction exhibit obvious stress path dependency, and the conventional constitutive models cannot accurately describe their stress-strain response. This paper proposes a modified generalized plasticity model considering stress paths effect based on the analysis of large-scale triaxial experiments, which can accurately simulate the behavior of rockfill materials under various stress paths.
Rockfill materials used for dam construction show obvious stress path dependency during construction process. The constitutive model for rockfill materials are mainly established based on conventional triaxial test. This brings some deviation to the numerical calculation for earth rockfill dam engineering, and it is necessary to develop a constitutive model considering stress paths effect. In the framework of generalized plasticity, plastic modulus can be expressed as the function of dilatancy equation and tangent modulus, hence the influence of stress paths on model can be transfer to the dilatancy equation and tangent modulus. This leads to a new method to describe stress-strain response of rockfill under various loading stress paths. Based on the analysis of large-scale triaxial experiments of rockfill materials with various stress paths, we proposed new dilatancy equation and tangent modulus to better describe stress paths effect and corresponding modified generalized plasticity model is established. Through the prediction and comparison of three groups of rockfill materials triaxial tests, the model established in this paper can simulate behaviors of rockfill materials under various stress paths, using only a set of parameters. (C) 2022 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.

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