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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)
Article
  • 10 Downloads

Abstract

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 

冻融循环状态下土石混合体损伤机理

摘要

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。

关键词

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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References

  1. [1]
    SUN H F, JU Y, WANG X F. Review of the study on deformation, failure and the mesomechanisms of rock-soil mixture (RSM) [J]. J Sci China Tech Sci, 2014, 44(2): 172–181. (in Chinese)Google Scholar
  2. [2]
    XU W J, HU R L. Particle size fractal characteristics of the soil-rock mixtures in the right bank slope of Jinsha river at Longpan, tiger-leaping gorge area [J]. Journal of Engineering Geology, 2006, 4(4): 496–501. (in Chinese)Google Scholar
  3. [3]
    LI X, LIAO Q L, HAO J L. Study on in-situ tests of mechanical characteristics on soil-rock aggregate [J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(12): 2377–2384. (in Chinese)Google Scholar
  4. [4]
    XU W J, XU Q, HU R L. Study on the shear strength of soil-rock mixture by large scale direct shear test [J]. J Int J Rock Mech Min Sci, 2011, 48(8): 1235–1247. DOI: 10.1016/j.ijrmms.2011.09.018.Google Scholar
  5. [5]
    SHU Z L, LIU X R, LIU B X. Study of strength properties of earth-rock aggregate based on fractals [J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(1): 2651–2656. (in Chinese)Google Scholar
  6. [6]
    SUN H F, YANG Z K, XING M X. CT investigation of fracture mechanism of soil mixture [J]. J Appl Mech Mater, 2012, 204–208: 67–71. DOI: 10.4028/www.scientific.net/ AMM. 204–208.67.Google Scholar
  7. [7]
    MA T, TANG T, HUANG X M, WANG H. Numerical analysis on thermal regime of wide embankment in permafrost regions of Qinghai-Tibet Plateau [J]. Journal of Central South University, 2016, 23(12): 3346–3355. DOI: 10.1007/s11771-016-3400-x.Google Scholar
  8. [8]
    YANG X L, YAO C. Stability of tunnel roof in nonhomogeneous soils [J]. International Journal of Geomechanics, 2018, 18(3): 06018002. http://doi.org /10.1061/(ASCE)GM.1943-5622.0001104.MathSciNetGoogle Scholar
  9. [9]
    REGEHR J D, MILLIGAN C A, MONTUFAR J, ALFARO M. Review of effectiveness and costs of strategies to improve roadbed stability in permafrost regions [J]. Journal of Cold Regions Engineering, 2013, 27(3): 109–131. DOI: 10.1061/(ASCE)CR.1943-5495.0000054.Google Scholar
  10. [10]
    KONG Q Z, WANG R L, SONG G B, YANG Z H, BENJAMIN S. Monitoring the soil freeze-thaw process using piezoceramic-based smart aggregate [J]. Journal of Cold Regions Engineering, 2014, 28(2): 06014001. DOI: 10.1061/(ASCE)CR.1943-5495.0000066.Google Scholar
  11. [11]
    SUN H F, YANG Z K, XING M X. Influence of freeze-thaw on mechanical properties of Lanzhou loess [J]. J Rock and Soil Mechanics, 2008, 29(4): 1077–1081. (in Chinese)Google Scholar
  12. [12]
    ZHANG Y, MA W, QI J L. Structure evolution and mechanism of engineering properties change of soils under effect of freeze-thaw cycle [J]. Journal of Jilin University (Earth Science Edition), 2013, 43(6): 1904–1914. (in Chinese)Google Scholar
  13. [13]
    ZHOU Z, YANG H, WANG X C, LIU B C. Computational model for electrical resistivity of soil-rock mixtures [J]. Journal of Materials in Civil Engineering, 2016, 28(8): 06016009. DOI: 10.1061/(ASCE)MT.1943-5533.0001559.Google Scholar
  14. [14]
    ZHOU Z, YANG H, WANG X C, LIU B C. Model development and experimental verification for permeability coefficient of soil-rock mixture [J]. International Journal of Geomechanics, 2017, 17(4): 04016106. DOI: 10.1061/ (ASCE)GM.1943-5622.0000768.Google Scholar
  15. [15]
    FENG Y, HE J X, LIU L. Experimental study of the shear strength characteristics of fine-grained soil under freezing and thawing cycles [J]. Journal of Glaciology and Geocryology, 2008, 30(6): 1013–1017. (in Chinese)Google Scholar
  16. [16]
    LI Z, LIU S H, WANG L J, FU Z Z. Experimental study on the mechanical properties of clayey soil under different freezing apparatus temperatures and freeze-thaw cycles [J]. Scientia Iranica, Transactions A: Civil Engineering, 2013, 20(4): 1145–1152.Google Scholar
  17. [17]
    LI J L, ZHOU K P, ZHANG Y M, XU Y J. Experimental study of rock porous structure damage characteristics under condition of freezing-thawing cycles based on nuclear magnetic resonance technique [J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(6): 1208–1214. (in Chinese)Google Scholar
  18. [18]
    ZHENG X, MA W, BING H. Impact of freezing-thawing cycles on structure of soils and its mechanism analysis by laboratory testing [J]. J Rock and soil mechanics, 2015, 36(5): 1282–1294. DOI: 10.16285/j.rsm.2015.05.006.Google Scholar
  19. [19]
    LIU H, YANG G S, YE W J, WEI Y, TIAN J F. Experimental study on strength damage of undisturbed loess under freeze-thaw cycles condition [J]. Journal of Xi’ an University of Science and Technology, 2016, 36(5): 633–639. (in Chinese)Google Scholar
  20. [20]
    XU J, LI C Y, WANG Z Q, REN J W, YUAN J. Experimental analysis on the mechanism of shear strength deterioration of undisturbed loess during the freeze-thaw process [J]. Journal of Civil, Architectural & Environmental Engineering, 2016, 38(5): 90–98. (in Chinese)Google Scholar
  21. [21]
    ZHOU Z, YANG H, XING K, WANG H. Prediction models of the shear modulus of normal or frozen soil-rock mixtures [J]. Geomechanics and Engineering, 2018, 15(2): 783–791. DOI: 10.12989/gae.2018.15.2.783.Google Scholar
  22. [22]
    AHMED A, SHEHATA M, EASA S. Use of factory-waste shingles and cement kiln dust to enhance the performance of soil used in road works [J]. Advances in Civil Engineering, 2009: 143750. DOI:10.1155/2009/143750.Google Scholar
  23. [23]
    JAMES J, KASINATHA P. Plasticity, swell-shrink, and micro structure of phosphogypsum admixed lime stabilized expansive soil [J]. Advances in Civil Engineering, 2016: 9798456. http://dx.doi.org/10.1155/2016/9798456.Google Scholar
  24. [24]
    PENG H, MA W, MU Y H, JIN L. Impact of permafrost defradation on embankment deformation of Qinghai-Tibet Highway in permafrost regions [J]. Journal of Central South University, 2015, 22(3): 1079–1086. DOI: 10.1007/ s11771-015-2619-2.Google Scholar
  25. [25]
    ZHANG H Y, XU W J, YU Y Z. Numerical analysis of soil-rock mixture’s meso-mechanics based on biaxial test [J]. Journal of Central South University, 2016, 23(3): 685–700. DOI: 10.1007/s11771-016-3114-0.Google Scholar
  26. [26]
    XING K, ZHOU Z, YANG H, LIU B C. Macro-meso freeze-thaw damage mechanism of soil-rock mixtures with different rock contents [J]. International Journal of Pavement Engineering, 2018, DOI: 10.1080/10298436.2018.1435879.Google Scholar
  27. [27]
    JIN L, ZENG Y W, LI J J. Analysis on meso-mechanisms of influence of rock block shape on mechanical properties of cemented soil-rock mixture [J]. Chinese Journal of Solid Mechanics, 2015, 34(6): 506–516. (in Chinese)Google Scholar
  28. [28]
    JIN L, ZENG Y W, ZHANG S. Large scale triaxial tests on effects of rock block proportion and shape on mechanical properties of cemented soil-rock mixture [J]. Rock and Soil Mechanics, 2017, 38(1): 141–148. DOI: 10.16285/ j.rsm. 2017.01.018.Google Scholar
  29. [29]
    ZHU K, HU B, KOU T. Particle flow simulation of limestone triaxial test and analysis of energy distribution features [J]. J Gold, 2016, 5(37): 30–35. (in Chinese)Google Scholar
  30. [30]
    SHAO L, CHI S C, ZHANG Y. Study of triaxial shear tests for rockfill based on particle flow code [J]. J Rock and Soil Mechanics, 2013, 34(3): 711–720. (in Chinese)Google Scholar

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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