非饱和土土-水特征曲线的温度效应  

Temperature effects on soil-water characteristic curve of unsaturated soils

作　　者：蔡国庆[1] 赵成刚[1] 刘艳[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《岩土力学》2010年第4期1055-1060,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50778013);北京市自然科学基金资助项目(No.8082020)

摘　　要：基于热力学的理论,利用van Genuchten的土-水特征曲线表达式,建立了一种能考虑温度影响的土-水特征曲线方程,并给出了推导过程。该表达式综合考虑了温度对表面张力和浸润系数的影响。相对于根据试验数据拟合的表达式,该表达式具有更加坚实的理论基础,更具适用性和一般性。选用MX-80斑脱土和黄土土样的试验结果,将该方程预测结果和试验结果进行了比较;可以看到,所提出的方程能较好地反映非饱和土土-水特征曲线随温度而变化的情况。The thermodynamic based expression of suction for unsaturated soils was presented. This expression can consider the temperature effects on suction for both surface tension and wetting coefficients. On contrast of expressions by experimental data fitting, its theoretical basis was more strict, and hence it had broader applicability. By adopting the van Genuchten expression of soil-water characteristic curve, a new model considering the temperature effects was established. Based on the experiments of MX-80 bentonite and loess, model predictions were compared with the experimental results; it is shown that the model agreed well with the existing data.

关 键 词：非饱和土 热力学 土-水特征曲线 温度效应 

分 类 号：TU41[建筑科学—岩土工程]