摘要
通过室内相同温度条件下５种土类的冻结试验，研究了不同土类冷生组构的形成。试验表明，分凝冰层及冷生组构的形成主要取决于土的水、热性质以及分散度等因素。日本火山灰中冻结缘具有较高的导湿系数，且冻结锋面前移速度缓慢，形成７．２ｃｍ的厚冰层；临夏高岭土、内蒙古粘土和兰州黄土中冻结缘导湿系数逐渐减小，且冻结锋面前移速度逐渐加大，形成从厚层状到微层状冷生构造的演变，分凝冰层厚度逐渐减薄，从３－１０ｍｍ到小于１－３ｍｍ；兰州砂土因原位冻结而形成整体状构造。
By laboratory freezing tests of five kinds of soils under the same temperature conditions，the influence of soil type on ice formation and cryogenic structure of freezing soils was stu－died．Results show that formation of segregative iee layers and cryogenic structure in freezingsoils mainly depends on hydraulic and thermal properties and dispersity of soils．Iee layerwith the highest thickness of 7．2 cm was formed in Japanese volcanic ash by higher hydraulicconductivity of frozen fringe and lower freezing rate. For Linxia kaolinite，Neimong clay andLanzhou loess the thickness of segregative ice layers was gradually decreased from 10 to 3mm，even less than 3 to 1 mm by hydraulic conductivity decreasing and freezing rate in－creasing and cryogenic structure was changed from thick layers to the thin layers．ForLanzhou sand only massive cryogenic structure could be seen because of in－situ freezing.
出处
《冰川冻土》
CSCD
北大核心
1995年第1期16-22,共7页
Journal of Glaciology and Geocryology
关键词
正冻土
成冰
冷生组构
土壤
冻土
：cryogenic structure，freezing soil，ice formation
