水分迁移对冻土细观结构的影响

doi:10.7522/j.issn.1000-0240.2016.0074

冰川冻土 ›› 2016, Vol. 38 ›› Issue (3): 671-678.doi: 10.7522/j.issn.1000-0240.2016.0074

水分迁移对冻土细观结构的影响

明锋, 李东庆, 陈世杰

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

收稿日期:2016-02-29 修回日期:2016-04-03 出版日期:2016-06-25 发布日期:2016-09-21
通讯作者: 李东庆,E-mail:dqli@lzb.ac.cn. E-mail:dqli@lzb.ac.cn
作者简介:明锋(1986-),男,重庆人,助理研究员,2014年在中国科学院寒区旱区环境与工程研究所获博士学位,现主要从事冻土物理学方面的研究工作.E-mail:mf0329@163.com
基金资助:
国家自然科学基金项目（41271080）；冻土工程国家重点实验室项目（SKLFSE-ZQ-35）；国家重点基础研究发展计划项目（2012CB026102）资助

Impact of water migration on meso-structure of frozen soil

MING Feng, LI Dongqing, CHEN Shijie

State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

Received:2016-02-29 Revised:2016-04-03 Online:2016-06-25 Published:2016-09-21

摘要/Abstract

摘要： 冻结作用导致土体中产生了水分迁移，从而改变了土体密度，进而改变了土体结构性及其物理力学性质。利用CT设备，对冻融前后的土样进行CT细观试验，通过CT数变化定量分析土样的损伤程度，反映冻土结构的变化。结果表明：冻结过程中同时发生了裂纹的张开与闭合，冰透镜体位置裂纹数量在冻结后明显增加。冻结区土样在水分迁移并结晶的作用下被切割成多个多边形，造成土样孔隙增大，导致CT数减小，损伤量增大。融土区土体在冻胀力作用下产生了一定的固结，使得其密度增大，CT数增大，损伤量表现为负值。上部荷载对土体损伤有抑制作用，而冻融作用却加剧了土体损伤。

关键词: 冻土, 水分迁移, 细观结构, CT扫描

Abstract: Structural change of soil due to freezing-thawing is the main cause of the variation of physical-mechanical properties of soil. In this paper,a frost-susceptible soil was taken as the research object for investigating the structural change induced by the redistribution of water. The CT scanning of soil before and after the unidirectional freezing tests was carried out for quantitative analysis of the change in soil structure. The result shows that CT scanning has been demonstrated to be successful in monitoring water migration within the frozen soil specimens. The preliminary results indicate that the freezing process causes water migration,resulting in change in density of the soil specimen. The cracks are opening or closing in the freezing process and the number of cracks around the ice lens increase after freezing. CT can produce clear images showing the ice lens distribution within a frozen soil and the CT number can reflect the amount of water migration,as well as the consolidation of soil between the ice lenses. With the effect of frost heaving force,the unfrozen soil will be compacted and CT number will increased,so the damage amount is negative. The upper load will restrain soil damage,whereas freezingthawing will intensify soil damage.

Key words: frozen soil, water migration, meso-structure, CT scanning

中图分类号:

TH774

明锋, 李东庆, 陈世杰. 水分迁移对冻土细观结构的影响[J]. 冰川冻土, 2016, 38(3): 671-678.

MING Feng, LI Dongqing, CHEN Shijie. Impact of water migration on meso-structure of frozen soil[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2016, 38(3): 671-678.

参考文献

[1] Hu Kai,Lai Yuanming. Experimental study on the strength parameters and strength criteria of frozen siltysand[J]. Glaciology and Geocryology,2014,36(5):1199-1204. [胡凯,赖远明. 含盐冻结粉质砂土的强度参数和强度准则试验研究[J]. 冰川冻土,2014,36(5):1199-1204.]
[2] Yang Gengshe,Pu Yibin. Initial discussion on the damage propagation of rock under the frost and thaw condition[J]. Journal of China Coal Society,2002,27(4):357-360. [杨更社, 蒲毅彬. 冻融循环条件下岩石损伤扩展研究初探[J]. 煤炭学报,2002,27(4):357-360.]
[3] Chen Shijie,Zhao Shuping,Ma Wei,et al. Studying frozen soil with CT technology:Preshengt and prospects[J]. Glaciology and Geocryology,2013,35(1):193-200. [陈世杰, 赵淑萍,马巍,等. 利用CT 扫描技术进行冻土研究的现状和展望[J]. 冰川冻土,2013,35(1):193-200.]
[4] Peyton R L,Haeffner B A,Anderson S H,et al. Applying Xray CT to measure macropore diameters in undisturbed soil cores. Geoderma,1992,53(3-4):329-340.
[5] Torrance J,Elliot T,Martin R,et al. X-ray computed tomography of frozen soil[J]. Cold regions science and technology, 2008,53(1):75-82.
[6] Pu Yibin. The introduction of applying method for CT in frozen soil experiment research[J]. Glaciology and Geocryology, 1993,15(1):196-198. [蒲毅彬. CT 用于冻土实验研究中的使用方法介绍[J]. 冰川冻土,1993,15(1):196-198.]
[7] Wu Ziwang,Ma Wei,Pu Yibin,et al. Monitoring the change of structures in frozen soil in uniaxial creep process by CT[J]. Glaciology and Geocryology,1996,18(4):306-311. [吴紫汪,马巍,蒲毅彬,等. 冻土单轴蠕变过程中结构变化的 CT动态监测. 冰川冻土,1996,18(4):306-311.]
[8] Ling Xianzhang,Xu Xueyan,Qiu Mingguo,et al. Study on CT scanning of Harbin frozen silty clay: Before and after dynamic triaxial test[J]. Chinese Journal of Rock Mechanics and Engineering,2003,22(8):1244-1249. [凌贤长,徐学燕,邱明国,等. 冻结哈尔滨粉质黏土动三轴试验CT 检测研究[J]. 岩石力学与工程学报, 2003, 22(8): 1244-1249.]
[9] Sun Xingliang,Wang Ren,Hu Mingjian. A CT-timely experimental study on meso-scopic structural damage development of frozen soil under triaxial shearing[J]. Rock and Soil Mechanics, 2005,26(8):1298-1311. [孙星亮,汪稔,胡明鉴. 冻土三轴剪切过程中细观损伤演化CT动态试验[J]. 岩土力学,2005,26(8):1298-1311.]
[10] Liu Zengli,Zhang Xiaopeng,Li Hongsheng. A damage constitutive model for frozen soils under uniaxial compression based on CT dynamic distinguishing[J]. Rock and Soil Mechanics, 2005,26(4):543-546. [刘增利,张小鹏,李洪升. 基于动态CT识别的冻土单轴压缩损伤本构模型[J]. 岩土力学,2005,26(4):543-546.]
[11] Zheng Jianfeng,Zhao Shuping,Ma Wei,et al. Study of the effect of freezing on frozen soil specimen preparation[J]. Glaciology and Geocryology,2009,31(1):130-138. [郑剑锋, 赵淑萍,马巍,等. 冻结方式对冻土试样制备的影响[J]. 冰川冻土,2009,31(1):130-138.]
[12] Zhao Shuping,Ma Wei,Zheng Jianfeng,et al. CT real-time monitoring on frozen Lanzhou loess with different temperature under uniaxial loading[J]. Rock and Soil Mechanics, 2010, 31(S2):92-97. [赵淑萍,马巍,郑剑锋,等. 不同温度条件下冻结兰州黄土单轴试验的CT 实时动态监测[J]. 岩土力学,2010,31(增刊2):92-97.]
[13] Fang Lili,Qi Jilin,Ma Wei. Freezing-thaw induced changes in soil structure and its relationship with variations in strength[J]. Glaciology and Geocryology,2012,34(2):435-440.[方丽莉,齐吉琳,马巍. 冻融作用对土结构性的影响及其导致的强度变化[J]. 冰川冻土,2012,34(2):435-440.]
[14] Liu Bo,Li Dongyang,Liu Lulu,et al. CT scanning and images analysis during frozen soil thawing[J]. Journal of China Coal Society, 2012, 37(12): 2014-2019. [刘波, 李东阳,刘璐璐,等. 冻土正融过程CT 扫描试验及图像分析[J]. 煤炭学报,2012,37(12):2014-2019.]
[15] Yang Gengshe,Zhang Quansheng. Analsys for mechanism of rock microscopic damage and moisture- heat transfer under the frost and thaw conditon[M]. Xi'an:Shaanxi Science and Technology Press,2006:1-267. [杨更社,张全胜. 冻融环境下岩体细观损伤及水热水分迁移机理分析[M]. 西安:陕西科学技术出版社,2006:1-267.]
[16] Peppin S,Wettlaufer J,Worster M. Experimental verification of morphological instability in freezing aqueous colloidal suspensions[J]. Physical review letters, 2008, 100(23): 238301.
[17] Qi Jilin,Cheng Guodong,Vermeer P A. State of the art of influence of freeze-thaw on enginerring properties of soils[J]. Advances in Earth Science, 2005, 20(8): 887-894. [齐吉琳,程国栋,Vermeer P A. 冻融作用对土工程性质影响的研究现状[J]. 地球科学进展,2005,20(8):887-894.]
[18] Zhang Lianhai,Ma Wei,Yang Chengsong, et al. A review and prospect of the thermodynamics of soils subjected to freezing and thawing[J]. Glaciology and Geocryology,2013,35 (6):1505-1518. [张莲海,马巍,杨成松,等. 土在冻结及融化过程中的热力学研究现状与展望[J]. 冰川冻土 2013,35(6):1505-1518.]
[19] Azmatch T F,Sego D C,Arenson L U,et al. Tensile strength and stress-strain behaviour of Devon silt under frozen fringe conditions[J]. Cold Regions Science and Technology, 2011, 68 (1):85-90.
[20] Ren Jianxi. Real- time CT test of damage failure mechanism of frozen cracked rock in loading and unloading condition[J]. Chinese Journal of Geotechnical Engineering, 2004, 26(5): 641-644. [任建喜.冻结裂隙岩石加卸载破坏机理CT实时试验[J]. 岩土工程学报,2004,26(5):641-644.]
[21] Zeng Guijun,Zhang Mingyi,Li Zhenping,et al. Review of mechanical criterion for formation of ice lens in freezing soil[J]. Glaciology and Geocryology,2015,37(1):192-201.[曾桂军,张明义,李振萍,等. 冻土中冰透镜体形成力学判据的分析讨论[J]. 冰川冻土,2015,37(1):192-201.]

水分迁移对冻土细观结构的影响

Impact of water migration on meso-structure of frozen soil

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