Adaptive Strength Criterion of Sandy Gravel Material Based on Large-Scale True Triaxial Tests

Zhou, Yuefeng; Pan, Jinhe; Cheng, Zhi‐Lin; Zuo, Yujun

doi:10.1007/978-3-319-97112-4_146

Cited by 1 publication

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“…Summarizing, the triaxial test with glass beads provided a more accurate description of the mechanical response of granular materials, such as rockfill material. Remarkably, largescale true triaxial tests of rockfill materials by Zhou et al [42] and Zuo et al [43] indicate that the specimens transition from negative to positive dilatancy as the axial strain increases. In our tests, both drained and undrained triaxial tests commonly displayed positive dilatancy, but the specimens began to show a tendency toward negative dilatancy at higher effective mean principal stress, which was consistent with the results of the existing tests on gradual materials.…”

Section: Strength Characteristicsmentioning

confidence: 99%

Glass Beads Test with True Triaxial Stress Path Achieved by Conventional Triaxial Apparatus

Li,

Ma,

2024

Fractal Fract

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The impact of fabric anisotropy, fractal dimension, and breakage on the strength and deformation of granular materials were diminished by uniform-size spherical glass beads. Triaxial drained and undrained tests were performed on glass beads based on a novel method to substitute true triaxial stress paths with conventional triaxial apparatus equivalents with varying intermediate principal stress coefficients (b-values). The result indicates that all specimens manifested a noticeable strain-softening phenomenon. The peak strength decreased with increasing b-value, and the specimens showed more pronounced dilatancy. This pattern is similar to the results of the true triaxial test in current research. Compared to the undrained test, the peak friction angle in the drained test displayed a greater variation with varying b-values, which indicated that the mechanical response of glass beads is sensitive to water. This difference provides experimental evidence for comprehending effective stress in granular materials with constant friction coefficients. The experiments reflect the effect of b-value changes on the p-q stress path, as well as on the peak stress ratio, the state transition stress ratio, and the critical state stress ratio. The specimens exhibited a distinct shear band at different b-values ranging from 0.2 to 0.6, which is different from observations in conventional triaxial tests for granular materials.

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Section: Strength Characteristicsmentioning

confidence: 99%