Abstract
The dilatancy behavior of rockfill materials shows obvious stress path dependence. Lade-Kim plastic potential equation has been proposed for a long time to model the mechanical behavior of sand and concrete materials. However, it lacks the verification of rockfill materials, especially under various stress paths. In this paper, the dilatancy performance of coarse-grained materials under various stress paths is investigated, and then the dilatancy equation description and verification method based on Lade-Kim plastic potential are given. The applicability of Lade-Kim plastic potential for different stress path tests, such as conventional triaxial tests, constant P tests, and constant stress (increment) ratio tests, are verified and evaluated. It is found that Lade-Kim plastic potential is difficult to consider the influence of stress path. Finally, the Lade-Kim plastic potential, together with nonlinear dilatancy equation, is evaluated by changing the dilatancy equation in the framework of generalized plasticity. Lade-Kim plastic potential is suitable for constant stress increment ratio loading experiments and special care should be taken when applied to other stress paths. These works are helpful to understand stress path dependence of dilatancy behavior for rockfill materials and is beneficial for the establishment of stress path constitutive model.
Highlights
Rockfill is an important building material for high earth rockfill dam, and its deformation characteristics will significantly affect the safety of the dam
It can be seen from the three types of test prediction curves in Figures 15 and 16 that the nonlinear dilatancy equation is suitable for describing the dilatancy characteristics of rockfill materials under different stress paths
In this paper, based on a large number of coarse-grained material stress path tests, the adaptability of Lade-Kim plastic potential equation for different stress paths is evaluated and analyzed. e Lade-Kim plastic potential, together with nonlinear dilatancy equation, is applied in elastoplastic model to model the behavior of rockfill materials under various stress paths. e main conclusions are as follows: (1) e dilatancy characteristics of coarse-grained materials are different under different loading stress paths. e parameters for Lade-Kim plastic potential equation were calibrated only by a single soil triaxial compression test which may be not enough
Summary
Rockfill is an important building material for high earth rockfill dam, and its deformation characteristics will significantly affect the safety of the dam. The applicability of Lade-Kim plastic potential for different stress path tests, such as conventional triaxial tests, constant P tests, and constant stress (increment) ratio tests, should be verified and evaluated. E objectives of this paper are (1) to analyze the dilatancy characteristics of rockfill materials under different stress paths; (2) to study the adaptability of the dilatancy equation derived from Lade-Kim plastic potential surface for different stress paths and compare Lade-Kim plastic potential parameters for multiple stress path tests; and (3) to apply Lade-Kim plastic potential in generalized plasticity model to predict rockfill materials triaxial test and evaluate its performance by making comparison with nonlinear dilatancy equation
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