摘要
寒区季节性冻土冻胀性质对工程实际影响很大。为了了解温度对水分迁移现象的影响,本文通过地温测试仪对野外不同深度处的土层温度进行测量,并在不同时间相应深度取土样,测其含水率,通过比较不同时间不同深度处的含水率的变化情况来分析温度变化对水分迁移现象的影响。在气温回升之前,当地表温度降低时,温度随深度的降低而升高;随着地表温度不断降低,各深度处的温度也不断下降,温度梯度增加,各深度处地层的含水率变化大,即温度梯度的增加促进了季节性冻土区水分迁移现象的发生。
Cold nature of seasonal frozen soils has a great influence on engineering projects.This paper examines the effect of temperature on moisture migration in frozen soils.In order to understand the impact of the phenomenon,this paper measured the temperature of frozen soils at different depths in the field.It took the appropriate soil samples at different times,and measured the water content of the soil samples.By comparing the moisture contents at different depths and at different times,the paper analyzed the changes in temperature on the moisture migration phenomenon.Before the rise of air temperature,the local ground surface temperature was being reduced,the soil temperature decreased with its depth increased.As the ground surface temperatue continued to decrease,the soil temperatures at different depths were also decreased,the temperature gradient increased,the water contents at different depths changed substantially.The increase in the temperature gradient enhanced for the phenomenon of the water migration in seasonal frozen soils.
出处
《工程地质学报》
CSCD
北大核心
2010年第5期698-702,共5页
Journal of Engineering Geology
基金
国家自然科学基金项目(No:40372122
No:40672180)
国家自然科学基金国际合作项目(No:40911120044)
成都理工大学地质灾害防治与地质环境保护国家专业实验室开放基金(GZ2004-08)
关键词
季节性冻土
温度梯度
含水率
水分迁移
Frozen soil
Temperature gradient
Moisture content
Water migration
