作者中心
专家审稿
编委审稿
主编审稿
EXPERIMENTAL STUDY ON MOISTURE MIGRATION OF UNSATURATED LOESS UNDER FREEZING EFFECT
-
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.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.
-
Keywords:
- Unsaturated loess /
- Freezing /
- Water migration
-
-
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. -
期刊类型引用(15)
1. 刘睿姝，陈末，王冠华，陈寒冰. 单向冻结作用下非饱和土水分迁移对变化控制条件的响应. 水利科技与经济. 2023(01): 1-7 . 
百度学术
2. 王冠华，陈末，刘睿姝，陈寒冰. 冻结作用下砂土水盐运移规律试验研究. 黑龙江大学工程学报(中英俄文). 2023(04): 73-80 . 百度学术
3. 王升福，吕亮，刘光炎，罗成文，薛凯喜，李栋伟. 人工冻结红黏土冻融特性试验研究. 森林工程. 2022(05): 144-150 . 百度学术
4. 任秀玲，俞祁浩，王金国，张东明，张振宇，王新斌. 黏土单向冻融作用下冷生构造及冻胀特性试验研究. 水利学报. 2021(01): 81-92 . 百度学术
5. 叶万军，陈义乾，张登峰，白杨. 冻融作用下水分迁移对压实黄土强度影响的宏微观试验研究. 中国公路学报. 2021(06): 27-37 . 百度学术
6. 汪菲，唐少容，王红雨. 季冻区土体水分迁移研究综述. 灌溉排水学报. 2020(S1): 51-55+70 . 百度学术
7. 唐益群，赵文强，周洁. 封闭系统单向冻结淤泥质黏土水分迁移特性研究. 工程地质学报. 2020(05): 935-941 . 本站查看
8. 芮大虎，郭成，芦明，孟庆浩，伊藤譲. 冻结作用下黏土中水、盐迁移试验研究. 冰川冻土. 2019(01): 109-116 . 百度学术
9. 马德东. 运营条件下有砟轨道涵顶冻害整治技术应用研究. 高速铁路技术. 2018(03): 71-74 . 百度学术
10. 何陇霞，王旭，张延杰，李建东，尉晨煜. 非饱和黄土水蒸气扩散规律模型试验研究. 工程地质学报. 2018(05): 1265-1271 . 本站查看
11. 叶万军，刘宽，董西好，李倩，王岩. 干湿循环下重塑黄土水分迁移试验. 西安科技大学学报. 2018(06): 937-944 . 百度学术
12. 叶万军，刘忠祥，杨更社，赵志鹏. 温度变化条件下重塑黄土水分迁移试验. 煤田地质与勘探. 2017(04): 126-130 . 百度学术
13. 杨波. 寒冷地区普速铁路路基冻胀特征及维护对策. 铁道建筑. 2017(07): 97-99 . 百度学术
14. 徐湘田，王继伟，张明义. 冻结和林黄土力学性质的试验研究. 冰川冻土. 2016(03): 685-691 . 百度学术
15. 陈爱军，张家生，陈俊桦，明锋. 重塑黏土单向冻结过程中水分迁移试验研究. 南京林业大学学报(自然科学版). 2016(05): 115-120 . 百度学术
其他类型引用(31)
计量
- 文章访问数: 2656
- HTML全文浏览量: 176
- PDF下载量: 564
- 被引次数: 46
下载:
