Microscopic mechanical properties of rockfill materials under different stress paths

Zhang, Runhan; Zhang, Lingkai; Shi, Chong; Zhang, Yonggang; Cui, Yunchao

doi:10.1007/s10035-024-01413-7

Cited by 1 publication

(1 citation statement)

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“…The mechanical properties of rockfill materials are not only affected by microscopic factors, such as particle morphology and grading, but also closely related to different loading stress paths. Zhang R, Xu M et al [22,23] investigated the macro-and micromechanical properties of rockfill materials under different stress paths, and the results showed that there was a significant difference in the effect of stress paths on the deviatoric stress-strain, and strain-volume change characteristics of rockfill materials. The three-dimensional (3D) discrete element method (DEM) for triaxial tests has been used to simulate and study the shear behavior of granular materials [24].…”

Section: Introductionmentioning

confidence: 99%

Research on the Characteristic State of Rockfill Materials and the Evolution Mechanism at the Microscopic Scale

Cui,

Zhang,

Shi

et al. 2024

Applied Sciences

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In this study, the real particle morphology of rockfill materials is obtained through three-dimensional scanning technology, and flexible boundary conditions are established by coupling the discrete element method and the finite element method. Then, a large-scale three-axis numerical simulation test is carried out on the rockfill materials to study the macroscopic mechanical properties and the change rule of the microscopic view of the rockfill materials in different characteristic states. The macroscopic results show that the stress–strain curves of the rockfill materials can be divided into softening and hardening curves. The phase transition, peak, and critical states of the softening-type curves show different mechanical properties, but no clear distinction between the characteristic state changes can be seen in the hardening-type curves. The microscopic results show that the displacement of the upper and lower parts of the flexible boundary of the softening curve increases with loading, and there is no obvious displacement in the middle part, but the middle particles undergo rotational deformation. An “X” shear band appears, and the strength of the force chain and the coordination number tend to increase first and then decrease. The flexible boundary displacements of the hardening-type curves are similar to those of the softening-type curves, but the central particles show a large number of cleavages instead of shear zones, and the force chain strength and coordination number levels show a continuous upward trend.

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Section: Introductionmentioning

confidence: 99%