冻结作用下非饱和黄土水分迁移试验研究

张辉; 王铁行; 罗扬

doi:10.13544/j.cnki.jeg.2015.01.011

冻结作用下非饱和黄土水分迁移试验研究

doi: 10.13544/j.cnki.jeg.2015.01.011

1.
西安科技大学建筑与土木工程学院西安 710054;
2.
西安建筑科技大学土木工程学院西安 710055

基金项目:

国家自然科学基金项目(51078309,51208409),陕西省教育厅专项科研计划项目(12JK0914)资助

详细信息

作者简介:
张辉(1986-),男,博士,讲师,从事黄土及冻土工程理论及实践研究. Email:0107zhanghui@163.com

中图分类号: TU445
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- 被引次数: 0
出版历程
- 收稿日期: 2013-07-12
- 修回日期: 2014-05-20
- 刊出日期: 2015-02-25

EXPERIMENTAL STUDY ON MOISTURE MIGRATION OF UNSATURATED LOESS UNDER FREEZING EFFECT

1.
School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054;
2.
School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055

摘要

摘要: 通过室内大尺寸非饱和黄土冻结作用下水分迁移试验,开展了土体密度、含水量、冻结温度、冻结方式对非饱和黄土水分迁移影响的研究.试验结果表明:冻结过程中土样温度变化分为3个阶段:急剧降温阶段,缓慢降温阶段,稳定阶段; 干密度越大,稳定冻结锋面的水分迁移量越大,但冻结区的整体水分增量越小; 初始含水量越大,水分迁移量越大,并且在冻结锋面处含水量增幅越大; 在未冻结区,从邻近冻结锋面到暖端,含水量先增大后减小,初始含水量越小,这种现象越明显.此现象是冻结界面抽吸力、温度梯度和基质吸力梯度共同作用的结果.冻结方式直接影响已冻结区的含水量分布和水分迁移总量.
- 非饱和黄土 /
- 冻结 /
- 水分迁移
Abstract: This paper carries the moisture migration tests of unsaturated loess with the large size sample under freezing effect. It examines the influence of density, water content, freezing temperatures and freezing way on moisture migration of unsaturated loess. Results show that the soil sample temperature change under freezing process is divided into three stages: rapid cooling stage, the slow cooling stage, and stable stage. For higher dry density, the increase of water content at the frozen front is greater, but the increase of water migration of moving to the frozen part is lower. For a certain dry density, if the initial water content is higher, the amount of moisture migration is greater. And the increase of water content of the frozen front is also the greater. From the cold end to the warm end in the unfrozen area, water content increases at first, then decreases. And, this phenomenon is the more evident with lower initial water content. This phenomenon is the combined effect of the freezing interface suction force, temperature gradient and the matric suction gradient. The water content distribution and the total amount of moisture migration in frozen area are affected directly by the freezing way.
- Unsaturated loess /
- Freezing /
- Water migration

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参考文献(1)

Dong C H, Zhao X Q. 2013. Analysis on subgrade deformation features and influence factors in permafrost regions on Qinghai Tibet Railway[J]. Railway Standard Design, (6): 5～8.

Gilpin R R. 1985. A model for the prediction of ice tensing and frost heave in soils[J]. Water Resources Research, 16 (5): 918～930.

Konrad J M, Morgenstern N R. 1980. A mechanistic theory of ice lens formation in finegrained soils[J]. Canadian Geotechnical Journal, 17 (4): 473～486.

Li P, Li T L, Wang A D, et al. 2013. Insitu test research on regularities of water migration in loess[J]. Rock and Soil Mechanics, 34 (5): 1331～1339.

Ma S X. 2012. Experimental study of freezing-thawing to spalling of loess slope[Thesis of Master][D]. Xi'an : Xi'an University of Science and Technology.

Mao X S, Hou Z J, Kong L K. 2010. Dynamic observation and analysis of moisture migration for windblow sand in open system during frost[J]. Chinese Journal of Rock Mechanics and Engineering, 29 (1): 202～208.

Nassar I N, Horton R, Globus A M. 1997. Thermally induced water transfer in stalinized unsaturated soil[J]. Soil Science Society of American Journal, 61 (6): 1293～1298.

Prat M. 1986. Analysis of experiments of moisture migration caused by temperature differences in unsaturated porous medium by means of twodimensional numerical simulation[J]. International Journal of Heat and Mass Transfer, 29 (7): 1033～1039.

Shoop S A, Bigl S R. 1997. Moisture migration during freeze and thaw of unsaturated soils: Modeling and large scale experiments[J]. Cold Regions Science and Technology, 25 (1): 33～45.

Wang T H, Su L J. 2010. Experimental study on moisture migration in unsaturated loess under effect of temperature[J]. Journal of Cold Regions Engineering, 24 (3): 77～86.

Xu J, Niu F J, Niu Y H, et al. 2013. Analysis on the moisture migration of subgrade soil under effect of temperature gradient. Journal of Chongqing University, 36 (4): 152～158.

Zhao G, Tao X X, Liu B. 2009. Experimental study on water migration in undisturbed soil during freezing and thawing process[J]. Chinese Journal of Geotechnical Engineering, 31 (12): 1952～1957.

董昶宏, 赵相卿. 2013. 青藏铁路多年冻土区路基变形特征及影响因素分析[J]. 铁道标准设计, (6) : 5～8.

李萍, 李同录, 王阿丹,等. 2013. 黄土中水分迁移规律现场试验研究[J]. 岩土力学, 34 (5): 1331～1339.

马世雄. 2012. 冻融作用对黄土边坡剥落影响的试验研究[硕士学位论文][D]. 西安: 西安科技大学.

毛雪松, 侯中杰, 孔令坤. 2010. 冻结条件下开放体系风积砂水分迁移的动态观测及分析[J]. 岩石力学与工程学报, 29 (1):202～208.

许建, 牛富俊, 牛永红,等. 2013. 冻结过程路基土体水分迁移特征分析[J]. 重庆大学学报, 36 (4): 150～158.

赵刚, 陶夏新,刘兵,等. 2009. 原状土冻融过程中水分迁移试验研究[J]. 岩土工程学报, 31 (12): 1952～1957.

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