摘要
路基冻胀融沉是多年冻土区路基的主要病害。冻胀融沉病害与土体水分迁移以及温度变化密切相关,而冻土温度变化和水分迁移又会相互影响。基于非饱和土渗流和热传导理论,建立冻土水热耦合问题的联合求解微分方程;然后采用COMSOL Multi-physics软件进行二次开发,实现冻土温度场和水分场全耦合数值模拟;进而将数值模拟结果与土柱冻结和融化实验的结果进行对比,验证水热耦合数值模拟模型的有效性;最后以青海省玛多县地区路基为例,研究多年冻土路基中温度场与水分场的分布和变化规律。
Frost heaving and thaw collapsing are the main defects of subgrade in permafrost areas and are highly related to the coupled heat-moisture migration. Based on the water flow theory of unsaturated soil and the heat transfer theory of soil, the differential equations for coupled water and heat transfer are established. The coupled water and heat transfer problem of frozen soil is solved using the secondary development of COMSOL Multi-physics. To verify the method for simulating the heat-moisture coupled process, the freezing and thawing processes of soil columns are simulated, and the results are compared with the measured data from laboratory tests. Finally, a case study is carried out for the subgrade in Maduo county, Qinghai Province, and the characteristics of the coupled heat-moisture migration in permafrost subgrade are analyzed.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2015年第S2期131-136,共6页
Chinese Journal of Geotechnical Engineering
基金
科技部973项目(2012CB026104)
国家自然科学基金项目(51109003
41271072)
关键词
冻土
水热耦合
非饱和土
冻胀融沉
路基
frozen soil
coupled water and heat transfer
unsaturated soil
frost heaving and thaw collapsing
subgrade
