摘要
为分析冻融作用对黄土湿陷性的影响,采用室内试验方法。首先,以Q3黄土为研究对象,采用增(减)湿法配制不同含水量黄土试样,测试黄土在无水补给条件下受温度影响的冻融变形、压缩变形、湿陷变形;对原状黄土进行颗粒分析及基本物理力学参数试验。试验结果表明:黄土是否产生冻胀取决于其含水量是否超过"临界冻胀含水量"。冻融黄土与原状黄土相比压缩变形量较大,把部分浸水湿陷变形转化为压缩变形,冻融作用使黄土的湿陷性弱化。冷冻黄土在相同温度下,含水量越大,湿陷系数越小;在同一含水量下,冻结温度愈低湿陷系数愈小。
In order to study and analyze the reason how freeze-thaw influence the collapse of loess,experiments were conducted in the laboratory. First,freeze-thaw deformation,compression deformation and collapsible deformation are tested under different test temperatures and without water supply. Particle size analysis and physical character indexes test are also conducted for intact loess. This test is conducted on Q3 loess with different moisture contents by moistening or demoistening method. It is found from these experiments that the loess frost heave is depended on whether its moisture contents exceeds critical frost heave moisture content; Compared with pre-freezing samples,compression deformation of post – thawing loess samples is greater; Conversely,coefficient of collapsibility is slighter. The freeze-thaw action makes the loess collapsibility weaken. Collapse coefficient of frozen loess decreases with the increases of moisture contents for the same test temperatures. But collapse coefficient decreases with the declining of test temperature for the same moisture contents.
出处
《地下空间与工程学报》
CSCD
北大核心
2016年第6期1710-1716,共7页
Chinese Journal of Underground Space and Engineering
关键词
增(减)湿
冻融变形
湿陷变形
临界冻胀含水量
湿陷系数
moistening or demoistening
frost-heave and thawing deformation
collapsible deformation
critical frost-heave moisture contents
collapse coefficient
