摘要
为了研究土体冻胀过程中透镜体的演变规律,并分析间歇冻结控制冻胀的机理.采用分凝势理论的建立思路,在广义准静态的前提假设下,对透镜体的生长进行了理论分析.得到了透镜体生长的广义准静态模型,并对模型进行了初步的适用性考察,分析了透镜体生长曲线的定性特征.结果表明:模型基本适用于描述末透镜体的缓慢生长;控制冻深的间歇冻结模式通过间歇阶段有效抑制末透镜体的生长,从而控制冻胀;初始阶段促使冻结锋面迅速推进,锋面趋于稳定后,在保证冻土体功能的前提下,尽量增加间歇阶段时间,抑制末透镜体的发展,是选用冻结模式控制冻胀的基本原则.
The evolution of an ice lens during soil freezing was studied theoretically using segregation potential theory and the hypothesis of an expanded quasi-static process. The intermittent freezing method of controlling frost heave was also examined. The applicability of the qua- si-static model and the qualitative characteristics of lens growth were analyzed. The results show that the model describes the slow growth of the final ice lens and how intermittent freezing controls frost heave by restraining the final lens＇ growth. The basic principle for controlling frost heave is to have a fast moving freezing front at the preliminary stages of freezing and to increase the time of intermittent phase to restrain ice lens development as the front stabilizes.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2008年第3期333-338,共6页
Journal of China University of Mining & Technology
基金
国家自然科学基金重点项目(50534040)
国家自然科学基金项目(40471021)
国家科技计划重点项目(2006BAB16B01)
高等学校博士学科点专项科研基金项目(20040290502)
关键词
分凝势
透镜体
广义准静态
冻胀控制
segregation potential
ice lens
expanded quasi-static
frost heave control
