Geomechanics and Engineering

  • 제14권4호
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  • Pages.307-314
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  • 2018
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Mechanism of shear strength deterioration of loess during freeze-thaw cycling

  • Xu, Jian (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Wang, Zhangquan (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Ren, Jianwei (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Yuan, Jun (Northwest Electric Power Design Institute of Co. Ltd. of China Power Engineering Consulting Group)
  • 투고 : 2017.06.16
  • 심사 : 2017.08.07
  • 발행 : 2018.03.20
⟨ 이전 논문 다음 논문 ⟩

초록

Strength of loess that experienced cyclic freeze and thaw is of great significance for evaluating stability of slopes and foundations in loess regions. This paper takes the frequently encountered loess in the Northwestern China as the study object and carried out three kinds of laboratory tests including freeze-thaw test, direct shear test and SEM test to investigate the strength behaviors of loess after cyclic freeze and thaw, and the correlation with meso-level changes in soil structure. Results show that for loess specimens at four dry densities, the cohesion decreases with freeze-thaw cycles until a residual value is reached and thus an exponential equation is proposed. Besides, little change in the angle of internal friction was observed as freeze-thaw proceeds. This may depend on the varying of soil structure, based on which a clue can be found from the surface morphology and mesoscopic scanning of loess specimens. Clearly we observed significant changes in surface morphology of loess and it tends to aggravate at higher water contents or more cycles of freeze and thaw. Moreover, freeze-thaw cycling leads to obvious changes in the meso-structure of loess including lowering the particle aggregates and increasing both the proportion of fine particles and porosity area ratio. A damage variable dependent on the ratio of porosity area is introduced based on the continuum damage mechanics and its correlation with cohesion is discussed.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

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피인용 문헌

  1. Experimental Study on Normal Frost-Heave Force Generated from Loess upon Freezing considering Multiple Factors vol.2019, pp.None, 2019, https://doi.org/10.1155/2019/1237105
  2. Experimental investigation into non-collapsible loess-like soil's engineering geological properties under the influence of freeze–thaw cycles vol.53, pp.4, 2018, https://doi.org/10.1144/qjegh2019-139
  3. The Influence of Regional Freeze-Thaw Cycles on Loess Landslides: Analysis of Strength Deterioration of Loess with Changes in Pore Structure vol.12, pp.11, 2020, https://doi.org/10.3390/w12113047
  4. Data-driven framework for predicting ground temperature during ground freezing of a silty deposit vol.26, pp.3, 2018, https://doi.org/10.12989/gae.2021.26.3.235