摘要
对分凝冰现象的研究是理解冻土中各类复杂现象的关键。为研究上覆荷载作用下,线性降温模式的分凝冰形成规律,利用高低温交变箱,进行开放系统下土体的一维连续冻结试验。选取3个冷端初始温度,3个上覆荷载进行正交试验,比较分析每个试验条件下试样内部温度场的变化规律、冻结锋面随时间的推进规律、冻胀量变化规律以及水分的迁移情况。试验结果表明:上覆荷载越小,冷端初始温度越低,土样内部温度越低,含水率越高,冻胀量越大。
Research on the phenomenon of segregated ice is the key to understand all kinds of complex phenomenon in frozen soil.In order to research the effect of the formation rules for the segregated ice under the overlying load and the linear cooling mode,the one-dimensional continuous freezing test of the soil was carried out with high and low temperature alternating box in an open system.Three initial temperatures of cold junction and three overlying loads were selected for the orthogonal test,to compare and analyze the variation law of the temperature field of the specimen,freezing front with time,frost heave and water migration.Test results showed that the moisture content and frost heave increased with the decrease of overlying load and initial temperature of cold junction,which could lead to lower internal temperature of soil specimen.
出处
《工业建筑》
CSCD
北大核心
2017年第11期105-111,共7页
Industrial Construction
基金
国家自然科学基金项目(11272137)
关键词
冻土
冻胀量
分凝冰
线性降温
上覆荷载
frozen soil
frost heave
segregated ice
linear cooling
overlying load
