Journal of Central South University

, Volume 26, Issue 1, pp 13–24 | Cite as

Damage mechanism of soil-rock mixture after freeze-thaw cycles

  • Zhong Zhou (周中)Email author
  • Kai Xing (邢凯)
  • Hao Yang (杨豪)
  • Hao Wang (王浩)


As a widely distributed geological and engineering material, the soil-rock mixture always undergoes frequentative and short-term freeze-thaw cycles in some regions. Its internal structure is destroyed seriously, but the damage mechanism is not clear. Based on the damage factor, the damage research of properties of soil-rock mixture after different times of freeze-thaw cycles is investigated. Firstly, the size-distributed subgrade gravelly soil samples are prepared and undergo different times of freeze-thaw cycles periodically (0, 3, 6, 10), and indoor large-scale triaxial tests are completed. Secondly, the degradation degree of elastic modulus is considered as a damage factor, and applied to macro damage analysis of soil-rock mixture. Finally, the mesoscopic simulation of the experiments is achieved by PFC3D, and the influence on strength between soil-rock particles caused by freeze-thaw cycles is analyzed. The results show that freeze-thaw cycles cause internal damage of samples by weakening the strength between mesoscopic soil-rock particles, and ultimately affect the macro properties. After freeze-thaw cycles, on the macro-scale, elastic modulus and shear strength of soil-rock mixture both decrease, and the decreasing degree is related to the times of cycles with the mathmatical quadratic form; on the meso-scale, freeze-thaw cycles mainly cause the degradation of the strength between soil-rock particles whose properties are different significantly.

Key words

soil-rock mixture freeze-thaw cycle large-scale triaxial test strength between soil-rock particles 



土石混合体作为一种广泛分布的工程地质材料,在很多地区遭受频繁的短期冻融循环。其内部 结构受到严重损坏但破坏机理却不明晰。基于损伤因子,开展经历不同冻融次数下的土石混合体性 质的损伤研究。首先,准备级配试样使其经历不同次数冻融循环(0, 3, 6, 10),并进行大型三轴试验。 其次,将弹性模量衰减量视为损伤因子,应用于土石混合体宏观损伤研究。最后,利用PFC3D 模拟试 验围观过程,分析冻融循环下土石颗粒间强度损伤影响。结果表明:冻融循环通过削弱土石颗粒间强 度进而引起内部微观损伤,并最终影响宏观性质。冻融循环后,宏观上,土石混合体弹性模量与剪切 模量均减小,且减小量与冻融次数为二次函数关系;微观上,冻融循环主要引起本身属性极大不同的 土与石颗粒间强度的衰减。


土石混合体 冻融循环 大型三轴试验 土石颗粒间强度 


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Copyright information

© Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Civil EngineeringCentral South UniversityChangshaChina
  2. 2.Department of Architecture and Civil EngineeringCity University of Hong KongHong KongChina
  3. 3.School of Civil EngineeringSoutheast UniversityNanjingChina

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