针对冷凝条件下的“锅盖效应”现象,设计了简易的水气迁移试验模拟装置,进行不同干密度的北京地区粉土的水气迁移试验.试验结果表明:不同土体干密度的试验中,均发生了明显的水气迁移导致的土体低温端含水量增大的现象;随着土体干密度的增大,土体中水气迁移的速率随之下降,土体含水量增大的现象被弱化.因此,提高粉质土的干密度,虽不能避免水气迁移的发生,但可作为一项防治“锅盖效应”的有效辅助措施.
Abstract
To study the “Potcover Effect” phenomenon, a simple test and its apparatus are designed. A series of moisture migration test were carried on Beijing soils in different dry density. The test results bear the following findings: the water content mounts up in every moisture migration test on soils in different dry density; when the void ratio of soil reduces, the speed of moisture migration slows down as well. As a result, increasing the dry density of soils can be an effective supplementary approach against the “Potcover Effect” phenomenon.
关键词
锅盖效应 /
粉土 /
温度 /
水气迁移 /
含水量 /
干密度
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Key words
Pot-cover Effect /
soils /
temperature /
moisture migration /
water content /
dry density
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参考文献
[1] 李强,姚仰平,韩黎明,等. 土体的“锅盖效应”[J]. 工业建筑,2014,44(2): 69-71.
LI Q,YAO Y P,HAN L M,et al. Pot-cover Effect of soil[J]. Ind Constr,2014,44(2): 69-71.
[2] 陈林. 膨胀土地基的覆盖效应[J].工程勘察,1991(6):12-17.
CHEN L. Cover effect of expansive soil foundation [J]. Geotech Invest Surv ,1991(6):12-17.
[3] 卢靖. 非饱和黄土水分迁移问题的试验研究[D]. 西安:西安建筑科技大学,2006.
LU J. Research on the experimentation of moisture movement in unsaturated loess soils[D]. Xi′an: Xi′an University of Architecture and Technology, 2006.
[4] 贺再球. 非饱和土气态水迁移规律及其与液态水混合迁移的耦合计算[D]. 西安: 西安建筑科技大学,2004.
HE Z Q. Study of water vapor transfer and coupled calculation of vapor and liquid water in unsaturated soil[D]. Xi′an: Xi′an University of Architecture and Technology, 2004.
[5] 鲁兴社. 非饱和黄土气态水与液态水迁移的试验研究[D].西安:西安建筑科技大学,2010.
LU X S. Unsaturated loess water vapor and liquid water migration study[D]. Xi′an: Xi′an University of Architecture and Technology, 2010.
[6] 李述训,程国栋. 冻融土中的水热运输问题[M].兰州:兰州大学出版社,1995.
LI S X, CHENG G D. Water and heat transport in freezing and thawing soil[M]. Lanzhou: Lanzhou University Press, 1995.
[7] 王铁行,贺再球,赵树德,等. 非饱和土体气态水迁移试验研究[J]. 岩石力学与工程学报,2005,24(18):3271-3275.
WANG T H, HE Z Q, ZHAO S D, et al. Experimental study on vaporous water transference in loess and sandy soil[J]. Chin J Rock Mech Eng, 2005, 24(18): 3271-3275.
[8] 王铁行,陆海红. 温度影响下的非饱和黄土水分迁移问题探讨[J]. 岩土力学,2004,25(7):1081-1084.
WANG T H, LU H H. Moisture migration in unsaturated loess considering temperature effect[J]. J Rock Soil Mech, 2004, 25(7): 1081-1084.
[9] 孙建乐. 非饱和土水分迁移试验研究［J］. 西部探矿工程,2007，19(7): 36-38.
UN J L. Experimental study on water migration in unsaturated soil[J]. WestChina Explor Eng, 2007，19(7): 36-38.
[10] TETENS O. Uber einige meteorologische Begriffe［J］. Z Geophys, 1930, 6: 297-309.
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脚注
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基金
国家重点基础研究发展计划(973计划)资助项目(2014CB047006);国家自然科学基金资助项目(51209002)
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