Shear properties of breakable soil-rock mixture: effects of shearing scheme and particle concavity

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics Pub Date : 2025-09-15 DOI:10.1016/j.trgeo.2025.101726

Cangqian Sun , Fujiang Chen , Xiangyang He , Feng Zeng , Meiben Gao , Wuyue She

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引用次数: 0

Abstract

Soil-rock mixtures (SRM) serve as crucial engineering fill materials, with their shear properties being vital to the stability of infrastructure. To further refine the numerical shear testing scheme for SRM, this study proposes a PFC-FLAC coupling method integrated with a stochastic concave polyhedron generation technique. This approach systematically investigates: (1) the effects of different shearing schemes (stacked ring shear tests versus direct shear testing, SRST versus DST); and (2) the role of gravel particle concavity and breakability on the shear behavior of SRM. Results demonstrate that SRST outperforms DST in capturing the formation of a progressive shear zone, exhibiting a thicker shear zone that yields more realistic mechanical responses and shear strength parameters. Particle concavity simultaneously enhances interlocking mechanisms but promotes particle breakage, collectively governing the shear properties of SRM. Moderately concave gravel particles exhibit optimal compaction efficiency and shear strength, making them the preferred choice for transportation infrastructure fill materials. These findings provide critical insights for optimizing embankment designs in SRM-rich geological environments.

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破碎土石混合体的剪切特性：剪切方案和颗粒凹凸度的影响

土石混合体是重要的工程填土材料，其抗剪性能对基础设施的稳定性至关重要。为了进一步完善SRM数值剪切试验方案，本研究提出了一种结合随机凹多面体生成技术的PFC-FLAC耦合方法。该方法系统地研究了：(1)不同剪切方案的影响（堆叠环剪试验与直接剪切试验，SRST与DST）；(2)碎石颗粒的凹凸性和破碎性对碎石抗剪性能的影响。结果表明，SRST在捕获渐进剪切带的形成方面优于DST，显示出更厚的剪切带，从而产生更真实的力学响应和抗剪强度参数。颗粒的凹凸度同时增强了联锁机制，但也促进了颗粒的断裂，共同控制了SRM的剪切性能。中等凹度的砾石颗粒具有最佳的压实效率和抗剪强度，是交通基础设施填料的首选。这些发现为在srm丰富的地质环境中优化堤防设计提供了重要的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Transportation Geotechnics Social Sciences-Transportation

CiteScore

8.10

自引率

11.30%

发文量

194

审稿时长

51 days

期刊介绍： Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.