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Mechanical and electrical properties of coarse-grained soil affected by cyclic freeze-thaw in high cold regions

冻融循环作用下高寒地区粗粒土的力学和电学特性

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Abstract

To evaluate the geotechnical properties of coarse-grained soil affected by cyclic freeze-thaw, the electrical resistivity and mechanical tests are conducted. The soil specimens are prepared under different water contents, dry densities and exposed to 0-20 freeze-thaw cycles. As a result, the stress-strain behavior of the specimen (w =14.0% and ρd=1.90 g/cm3) changes from strain-hardening into strain-softening due to the freeze-thaw effect. The electrical resistivity of test specimen increases with the freeze-thaw cycles change, but the mechanical parameters (the unconfined compressive strength qu and the deformation modulus E) and brittleness index decrease considerably at the same conditions. All of them tend to be stable after 7−9 cycles. Moreover, both the dry density and the water content have reciprocal effects on the freeze-thaw actions. The failure and pore characteristics of specimens affected by freeze-thaw cycles are discussed by using the image analysis method. Then, an exponential function equation is developed to assess the electrical resistivity of specimens affected by the cyclic freeze-thaw. Linear relations between the mechanical parameters and the electrical resistivity of specimens are established to evaluate the geotechnical properties of the soil exposed to freeze-thaw actions through the corresponding electrical resistivity.

摘要

为评价冻融影响下高寒地区粗粒土的工程特性, 对不同干密度(ρd=1.90 g/cm3, 2.00 g/cm3, 2.15 g/cm3)、不同含水率(w=9.0%, 11.5%, 14.0%)的粗粒土在不同冻融循环(C=0~20 次)下电学和单轴 力学特性进行试验研究。结果表明, 循环冻融作用下, 低密度、高含水(ρd=1.9 g/cm3, w=14.0%)试样 的应力-应变关系从应变硬化型向软化型过渡。随着冻融循环次数的增加, 试样的电阻率(ρ)呈增长趋 势, 而单轴力学特性(单轴抗压强度qu、变形模量E)和脆性指标(IB)均显著衰减, 在7~9 次循环后趋于 稳定。此外, 冻融循环对试样的影响还受干密度和含水率的交互作用。采用图像法深入分析了冻融作 用下粗粒土的剪切破坏和孔隙结构特征。在修正的Archie 模型的基础上, 提出了考虑冻融影响的非饱 和含粘粒粗粒土的电阻率模型来评价试样电学特性的冻融效应。最后, 建立了冻融粗粒土的单轴抗压 强度、变形模量和电阻率的关系, 对基于无损的电阻率法评价冻融粗粒土力学特性具有重要意义。

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Authors and Affiliations

  1. College of Geological Engineering and Geomatics, Chang’an University, Xi’an, 710064, China

    Yong-long Qu  (屈永龙) & Wan-kui Ni  (倪万魁)

  2. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China

    Fu-jun Niu  (牛富俊), Yan-hu Mu PhD  (穆彦虎) (Associate Professor) & Jing Luo  (罗京)

  3. School of Civil and Architecture Engineering, Xi’an Technological University, Xi’an, 710021, China

    Yong-long Qu  (屈永龙)

  4. China Gold Group Tibet Tyrone Mining Development Co., Ltd., Lhasa, 850000, China

    Guo-liang Chen  (陈国良)

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Correspondence to Yan-hu Mu PhD  (穆彦虎).

Additional information

Foundation item: Project(2016ZGHJ/XZHTL-YQSC-26) supported by the Key Scientific Research Project of China Gold Group; Project(SQ2019QZKK2806) supported by the Second Tibetan Plateau Scientific Expedition and Research (STEP) Program, China; Project(300102268716) supported by the Fundamental Research Funds for the Central Universities, China; Project(LHKA-G201701) supported by the Science and Technology Project of Yalong River Hydropower Development Company, China

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Qu, Yl., Ni, Wk., Niu, Fj. et al. Mechanical and electrical properties of coarse-grained soil affected by cyclic freeze-thaw in high cold regions. J. Cent. South Univ. 27, 853–866 (2020). https://doi.org/10.1007/s11771-020-4336-8

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  • DOI: https://doi.org/10.1007/s11771-020-4336-8

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