摘要
为探求石灰改良路基土的冻胀特性,采用百分表、冻融试验箱等组成冻胀试验装置,通过同条件试件内部温度传感器,实时观测试件内部冻结温度,对试验土体进行了开敞式室内冻胀试验。试验结果表明:在相同的含水率下,石灰掺量越大,土体冻胀率越小,土体起始冻胀的温度区间为-2℃左右,当温度降至-10℃时冻胀基本结束,-2℃～-8℃为冻胀现象明显的温度区间,冻胀随温度降低呈现4个阶段的变化;含水率越大,冻胀率越大,掺灰剂量越大,起始冻胀含水率越高;石灰的掺加在一定程度上能抑制土体的冻胀现象。
For researching the frost heave properties of lime modified subgrade soil,the frost heave measuring system was made of dial indicator,free-thaw case and so on.The test-piece temperature was measured by test-piece internal temperature sensor under the same condition,and the open frost heave test was conducted.The results indicate the bigger the ratio of lime to soil,the smaller the ratio of frost heave,with the same moisture.Temperature of lime modified soil＇s frost heave is about-2 ℃.Frost heave almost ends at-10 ℃,and is obvious from-2 ℃ to-8 ℃.Frost heave changes in four stages with the temperature decreasing.The frost heave increases with moisture.The more the ratio of lime to soil,the more the initial moisture of frost heave.Lime can limit frost heave of soil to a certain extent.4 tabs,4 figs,15 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第3期27-31,共5页
Journal of Chang’an University(Natural Science Edition)
基金
黑龙江省交通厅重点科技项目(HJ20080011)
中央高校基本科研业务费专项资金项目(DL11BB07)
关键词
道路工程
石灰改良土
冻胀
含水率
冻胀温度
road engineering
lime modified soil
frost heave
moisture
temperature of frost heave
