摘要
选取青藏铁路沿线粉质黏土,进行了一维土样在连续、分步两种不同冻结模式下的冻胀响应试验和数值模拟研究,得到并分析其温度梯度场及土样冻胀量的演变规律。结果表明,与连续冻结模式相比,分步冻结模式更易产生较大冻胀量,其机制主要在于该冻结模式使得冻结缘内温度梯度较大。
Freezing tests in two different kinds of modes in the case of open system on 1D soil sample made of Tibetan silty clay are carried out,and the evolvement characteristics of the sample's frost heave、temperature gradient field are obtained. Then according to the self-made programme based on the heat and moisture coupled frost heave model,aforementioned tests are simulated,and the result of simulation is quite consistent with the test result. Our research shows that frozen soil can make more frost heave easily under stepwise freezing modes. Our analysis makes it clear that the temperature gradient in frozen fringe with stepwise freezing mode is greater than that with continuous freezing mode.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第S1期107-110,共4页
Rock and Soil Mechanics
基金
国家"973"项目(No.2002CB412704)
国家自然科学基金重点项目(No.50534040)
国家自然科学基金项目(No.40471021)
高等学校博士学科点专项科研基金(No.20040290502)
中国矿业大学青年科研基金项目(No.2005A005)。
关键词
冻结模式
冻胀
温度梯度场
freezing mode
frost heave
temperature gradient field
