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冰川冻土 ›› 2020, Vol. 42 ›› Issue (1): 205-215.doi: 10.7522/j.issn.1000-0240.2020.0028

• 寒区工程与灾害 • 上一篇    下一篇

冻融作用下砂土颗粒形态变化规律研究

恽晴飞1,2(), 张泽2,3,4(), 明姣2, 付翔宇1,2, 周成林2, MELNIKOV Andrey5   

  1. 1.兰州大学 土木工程与力学学院,甘肃 兰州 730000
    2.中国科学院 西北生态环境资源研究院 冻土工程国家重点实验室,甘肃 兰州 730000
    3.东北林业大学 土木工程学院/寒区工程与科学技术研究院,黑龙江 哈尔滨 150040
    4.东北林业大学 东北多年冻土区地质环境系统教育部野外科学观测研究站,黑龙江 哈尔滨 150040
    5.俄罗斯科学院 新西伯利亚分院 梅尔尼科夫冻土研究所,俄罗斯 雅库茨克 117997
  • 收稿日期:2019-02-16 修回日期:2020-02-01 出版日期:2020-06-30 发布日期:2020-07-03
  • 通讯作者: 张泽 E-mail:yunqf13@lzu.edu.cn;zhangze@lzb.ac.cn
  • 作者简介:恽晴飞(1995 - ), 男, 江苏无锡人, 2017年在兰州大学获学士学位, 现为兰州大学在读硕士研究生, 从事工程物探方面的研究. E-mail: yunqf13@lzu.edu.cn
  • 基金资助:
    国家自然科学基金项目(41771078);国家自然科学基金委员会(NSFC)与俄罗斯基础研究基金会(RFBR)合作交流项目(42011530083);Russian Foundation for Basic Research- RFBR(20-55-53006);雅砻江流域水电开发有限公司科学技术项目(LHKA-G201906)

Experimental study on morphometric changes of sand particles under freezing-thawing cycles

Qingfei YUN1,2(), Ze ZHANG2,3,4(), Jiao MING2, Xiangyu FU1,2, Chenglin ZHOU2, Andrey MELNIKOV5   

  1. 1.College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China
    2.State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    3.School of Civil Engineering & Institute of Cold Regions Engineering,Science and Technology,Northeast Forestry University,Harbin 150040,China
    4.Northeast-China Observatory and Research-Station of Permafrost Geo-Environment,Ministry of Education,Northeast Forestry University,Harbin 150040,China
    5.Melnikov Permafrost Institute,Siberian Branch,Russian Academy of Sciences,Yakutsk 117997,Russia
  • Received:2019-02-16 Revised:2020-02-01 Online:2020-06-30 Published:2020-07-03
  • Contact: Ze ZHANG E-mail:yunqf13@lzu.edu.cn;zhangze@lzb.ac.cn

摘要:

土壤中的石英颗粒的表面形态不仅是该沉积物物源区沉积环境、 搬运机制的信息载体, 同时也会直接影响到砂土的宏观物理特性, 对力学和实际工程有着重要的意义。借助显微与高精度图像处理技术, 采用长径比, 磨圆度两个量化指标, 对经过不同次数冻融作用的两组砂土颗粒进行观察。结果表明: 砂土颗粒在冻融循环过程中, 由于颗粒之间的相互作用, 磨圆度先增大后减小, 最后趋于稳定; 长径比先减小, 后增加, 最后趋于稳定。长径比与磨圆度的变化曲线共轭。

关键词: 冻融循环, 砂土, 颗粒形态, 磨圆度, 长短径比

Abstract:

The surface morphology of quartz particles in the soil is not only the information carrier of the sedimentary environment and transport mechanism from the sediment source area, but also directly affects the macroscopic physical property of the sand, which is of great significance to mechanics and practical engineering. Scanning electron microscope was used in this paper and two quantitative indexes, aspect ratio and psephicity, were used to observe two groups of sand particles subjected to different freezing-thawing cycles. It is hoped that by observing and studying the sand particles under different freeze-thaw cycles, the variation of the surface morphology of sand particles due to freezing-thawing have been summarized, which will provide theoretical basis for future studying the historical changes and paleoclimate environment in glacialized and frozen soil areas. It also provides theoretical support for the practical engineering application in seasonal frozen soil areas. It is shown that during the freezing-thawing, the psephicity of sand particles first increases, then decreases and finally tends to be stable due to the interaction among the particles. The aspect ratio first decreases, then increases, and finally stabilizes. The aspect ratio conjugates with the curve of psephicity. At the same time, during the freezing-thawing cycles, the frictional action among the particles occurs first, and then the great stress among the particles causes the particles to break down. The number of freezing-thawing cycles required for the crushing of coarse sand particles is obviously less than that of fine sand particles. With the increase of freezing-thawing cycles, the dynamic equilibrium of damage-grinding tends to be stable.

Key words: freezing-thawing cycle, sand, particle morphology, roundness, aspect ratio

中图分类号: 

  • P642.