| 饱和粉土冻结过程中的水分迁移试验研究 |
| |
| 引用本文： | 魏厚振,周家作,韦昌富,陈 盼.饱和粉土冻结过程中的水分迁移试验研究[J].岩土力学,2016,37(9):2547-2552. |
| |
| 作者姓名： | 魏厚振 周家作 韦昌富 陈 盼 |
| |
| 作者单位： | 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071 |
| |
| 基金项目： | 国家重点基础研究计划（973）项目课题（No.2012CB026102）； 国家自然科学基金项目（No. 41572295, No. 51239010）；中国科学院青年创新促进会项目（No.2015272）。 |
| |
| 摘 要： | 改变边界温度和土样高度，对饱和粉土进行了冻结试验，研究其水分迁移、水分重分布、冻胀和冰透镜体的发展规律。试验结果表明：当温度稳定时，水分持续迁移到冻结锋面附近，含水率急剧增大，易形成冰透镜体。饱和粉土冰透镜体几何形态较为规则，无枝状交叉结构，已冻土为整体状且无网状裂隙。冻结过程中存在起始冻胀时间，在起始冻胀时间之前，土中水分被排出，冻胀发生之后水分补给到冻土中，且补给水分产生的冻胀量和总冻胀量数值接近。土样高度影响水分迁移量和冻胀量，土样越高，冻胀量越小，冻土含水率增量越小，但水分增量分布区域越分散，且起始冻胀时间越长。
|
| 关 键 词： | 冻土 饱和粉土 水分迁移 冻胀 |
| 收稿时间： | 2014-09-16 |
Experimental study of water migration in saturated freezing silty soil |
| |
| WEI Hou-zhen,ZHOU Jia-zuo,WEI Chang-fu,CHEN Pan.Experimental study of water migration in saturated freezing silty soil[J].Rock and Soil Mechanics,2016,37(9):2547-2552. |
| |
| Authors: | WEI Hou-zhen ZHOU Jia-zuo WEI Chang-fu CHEN Pan |
| |
| Institution: | State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China |
| |
| Abstract: | Freezing tests are conducted on saturated silty soil samples with different boundary temperatures and heights to study water migration, water redistribution, frost heave and ice lens. The experimental results shows that, when temperature becomes steady, water keeps on migrating to freezing front and water content increases sharply near the freezing front and ice lens forms. The geometry of ice lenses in saturated freezing silty soil is regular without dendritic structure and frozen soil has massive structure without network of cracks. There is a starting time for frost heave, before which the water in soil is drained by the sudden freezing of the supper-cooled soil water. When the frost heave occurs water from outside supplies to the soil sample and the frost heave amount due to water inlet approximates to the total frost heave. The height of soil sample influences water migration and frost heaving amount. A higher soil sample has smaller frost heaving amount and less water content while water increment distributes more diffuse and the starting time for frost heave is longer. |
| |
| Keywords: | frozen soil saturated silty soil water migration frost heave |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
