颗粒形状对粒状材料破碎演化规律及强度准则影响

doi:10.16285/j.rsm.2022.0549

Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (3): 649-662.doi: 10.16285/j.rsm.2022.0549

• Fundamental Theroy and Experimental Research • Previous Articles Next Articles

Influence of particle shape on the particle crushing law and strength criterion for granular materials

ZHI Bin¹, WANG Xiao-chan¹, LIU En-long^{2, 3}

1. School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710000, China; 2. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China; 3. College of water Resources and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China

Received:2022-04-19 Accepted:2022-10-11 Online:2023-03-21 Published:2023-03-23
Supported by:
This work was Xi’an Key Laboratory of Geotechnical and Underground Engineering Open Fund(XKLGUEKF21-03).

Abstract

Abstract: In order to explore the influence of particle shape on the particle fragmentation and strength characteristics of granular materials, this paper proposes a new parameter to quantify the particle shape of granular materials, designs an artificial sample preparation method considering the three-dimensional particle shape feature information, then conducts a conventional triaxial compression test for these prepared samples, and analyzes the particle local breakage law and strength characteristics, finally derives a binary medium strength criterion. Some research results are drawn as follow. Quantitative parameter of particle shape—spherical modulus G_M is proposed. On this basis, five different shapes of triaxial specimens of crushable granular materials were prepared, and it is found that the spherical modulus affects the triaxial compressive strength characteristics of granular materials. The particle breakage of the sample is determined by sieving method, and the evolution law and critical state of the sample particle breakage is discussed, and particle shape is found to control the nonlinear evolutionary characteristics of macroscopic strength by influencing the particle fragmentation pattern. Based on the binary medium theory, the strength criterion of crushable granular materials considering the particle shape is established, and its applicability is verified by experiments results from conventional triaxial condition.

Key words: particle shape, particles crushing, critical states, binary medium model, strength criterion

CLC Number:

TU451

ZHI Bin, WANG Xiao-chan, LIU En-long, . Influence of particle shape on the particle crushing law and strength criterion for granular materials[J].Rock and Soil Mechanics, 2023, 44(3): 649-662.

References

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