水文地质工程地质2017，Vol.44Issue(4)：118-123,6.DOI:10.16030/j.cnki.issn.1000-3665.2017.04.18
冻融循环作用下冻结黏土矿物物理力学性质研究
Research on variability of freezing-thawing cycle on basic physical and mechanics properties of clay minerals
摘要
Abstract
The effect of freezing-thawing cycle is one of the main causes for destruction of frozen soil engineering.Under the effect of freezing-thawing cycles,tremendous changes will occur in the engineering properties of soil,which resulting in the deformation and failure of engineering in cold regions.By testing the physical properties and conducting spherical template indenter tests of kaolin (with the main clay minerals of kaolinite) and bentonite (with the main clay minerals of smectite).After repeated freezing and thawing tests,the changes in physical-mechanical properties of kaolin and bentonite under the effect of freezing-thawing cycle are examined,and the change rule of the physical-mechanics properties of the soil with different clay minerals under the effect of freezing-thawing cycle can be speculated.The results show that (1) the first 10 times of the freezing-thawing cycle have important effect on the physical and mechanical properties of kaolin and bentonite.After 10 times of freezing and thawing,with the increasing number of freezing and thawing time,the density of kaolin decreases and the pore ratio increases,and the density of bentonite increases and the pore ratio decrease;(2) changes in soil physical properties are not only related to the types of the soil samples,but also the essential effect of the mineral compositions of the soil;(3) kaolin's long-term strength (C24) is much higher than that of the bentonite (C24).However,in the process of freezing and thawing,the change in the kaolin's mechanic performance is larger,and the bentonite's mechanic performance is relatively stable.关键词
冻融循环/黏土矿物/物理力学性质/长期强度Key words
freeze-thaw cycle/clay mineral/physico-mechanical properties/long-term strength分类
建筑与水利引用本文复制引用
卢连长,张泽,冯文杰,杜微,刘博怀,周成林..冻融循环作用下冻结黏土矿物物理力学性质研究[J].水文地质工程地质,2017,44(4):118-123,6.基金项目
国家自然科学基金项目(41301070) （41301070）
中科院西部之光博士项目 （）
甘肃省交通运输厅科技项目(2014-03) （2014-03）
教育部留学回国人员科研启动基金项目(第46批) （第46批）
