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冻融作用对压实黄土结构影响的微观定量研究

穆彦虎, 马 巍, 李国玉, 毛云程

穆彦虎, 马 巍, 李国玉, 毛云程. 冻融作用对压实黄土结构影响的微观定量研究[J]. 岩土工程学报, 2011, 33(12): 1919-1925.
引用本文: 穆彦虎, 马 巍, 李国玉, 毛云程. 冻融作用对压实黄土结构影响的微观定量研究[J]. 岩土工程学报, 2011, 33(12): 1919-1925.
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MU Yan-hu, MA Wei, LI Guo-yu, MAO Yun-cheng. Quantitative analysis of impacts of freeze-thaw cycles upon microstructure of compacted loess[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(12): 1919-1925.
Citation: MU Yan-hu, MA Wei, LI Guo-yu, MAO Yun-cheng. Quantitative analysis of impacts of freeze-thaw cycles upon microstructure of compacted loess[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(12): 1919-1925.
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冻融作用对压实黄土结构影响的微观定量研究  English Version

  • (1. 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室，甘肃 兰州 730000 ； 2. 甘肃省交通科学研究所有限公司，甘肃 兰州 730050)

基金项目: 国家自然 科学基金项目（ 40821001 ， 41001041 ， 40801022 ， 40801026 ， 41071048 ）；西部交通建设科技项目（ 200831800025 ）； 中国科学院西部行动计划项目（ KZCX2-XB2-10 ）；冻土工程国家重点实验室研究项目（ SKLSE-ZQ-02 ， SKLFSE-ZY-03 ）
详细信息
    作者简介:

    穆彦虎 (1985 – ) ，男，新疆昌吉人，博士研究生，主要从事冻土力学与寒区工程方面的研究工作。

  • 中图分类号: TU444

Quantitative analysis of impacts of freeze-thaw cycles upon microstructure of compacted loess

  • (1. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou 730000, China; 2. Transportation Research Institute of Gansu Province, Lanzhou 730050, China)

摘要

    摘要
  • 摘要: 通过补水条件下的冻融循环试验，对经历不同冻融次数的压实黄土土样进行电镜扫描图像的定量分析，同时进行土样宏观物理性质的测试，探讨微观结构与宏观性质之间的关系，揭示冻融循环对压实黄土结构影响的过程与机理。研究结果表明，随着冻融循环次数的增加，土样内部冰晶的生长及冷生结构的形成导致土样中孔隙体积增加，土颗粒受到挤压并形成新的土骨架结构。大中孔隙个数及其所占孔隙总面积百分比显著增加，由 2 次冻融循环后的 78% 增加至 31 次冻融循环后的 90% 。同时，土样中出现一些由大中孔隙组成的、对黄土湿陷性起控制作用的架空孔隙。宏观物理性质测试表明，随着冻融循环次数的增加，土样含水率显著增加并出现重分布，而干密度则先减小而后基本保持不变。 31 次冻融循环后，土样上下层含水率相比于初始值增加分别超过 140% ， 50% ，而干密度则由初始的 1.86 g/cm3 减小为 1.55 g /cm3 ，减幅为 17% 。微观结构和宏观性质的改变均表明了冻融作用对于压实黄土结构的弱化作用。
    Abstract: After a series of laboratory experiments in an open system, the impacts of freeze-thaw cycles on the structure of compacted loess are studied by means of the quantitative analysis of scanning electron microscope images. The physical properties of the soils are tested simultaneously to discuss the relationship between microstructure and macro-properties of the loess. The results of microstructure analysis show that, with the increase of freeze-thaw cycles, the formation of cryogenesis results in obvious enlargement of pore volumes and therefore extrusion and redistribution of soil particles. The ratio of big- and mid- pore area to the total pore area increases from 78% after 2 cycles to 90% after 31 cycles. Meanwhile, some pores with open structure, which controls the loess collapsibility, are formed during the cycles. The results of macro-properties test show that, during the cycles, the water content of the samples increases significantly and is redistributed, and the dry density of the samples decreases initially and then keeps almost constant. After 31 cycles, the water contents at the upper and lower parts of the sample increase by more than 140% and 55%, respectively, whereas the dry density of the sample decreases from the initial value of 1.86 g/cm3 to 1.55 g/cm3, about a depression of 17%. Collectively, the results from both the micro- and macro-analyses indicate that the freeze-thaw action significantly weakens the structure of compacted loess.
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    • 参考文献(28)
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  • 发布日期:  2011-12-14

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