摘要
首先对非饱和土土水特征曲线滞后现象的产生机理与影响因素进行了探讨,总结并分析了各类滞后模型的原理和优劣.在此基础上引入研究土水特征曲线滞后现象的独立域模型理论,根据非饱和土干湿循环过程各个阶段的特点,分别建立了干燥/浸湿边界曲线、干燥/浸湿扫描线的积分方案.然后假定水量分布函数在整体域上符合正态分布,建立了基于正态分布的土水特征曲线独立域滞后模型,并提出了相关的修正方法.最后将该方法应用到已有试验数据的分析中.研究结果表明,该方法可较好反映非饱和土土水特征曲线的滞后现象,根据具体的干湿过程改变积分路径,即可实现扫描线的解算.
It is of great necessity to study on hysteresis phenomenon of soil-water characteristic curve （SWCC）, for it plays an important role in observing engineering behavior of unsaturated soils. For this, the mechanism and influential effects of the hysteresis SWCC were discussed firstly in this paper, then the principal and quality of various hysteresis models were compared. Based on these, the theory of independent domain model was introduced to study hysteresis pheonomenon of SWCC, and according to features of each stage of drying/wetting process, the integrative approaches for boundary drying/wetting curve and scanning drying/wetting curve were established respectively. Then, was made an hypothesis that water distribution agreed with the normal distribution function to establish the independent domain hysteresis model for SWCC, and a corrector method was also advised herein. Lastly, the method was applied to analyze existing experimental data, and the result indicated that, it could describe hysteresis phenomenon of SWCC well, and also could solve the scanning curve by using different integration path.
出处
《长沙理工大学学报（自然科学版）》
CAS
2009年第2期28-32,共5页
Journal of Changsha University of Science and Technology:Natural Science
基金
国家自然科学基金资助项目(40802064)
长沙理工大学人才引进基金资助项目(1004178)
关键词
非饱和土
独立域模型
土水特征曲线
滞后现象
正态分布函数
unsaturated soil
independent domain model
soil-water characteristic curve
hysteresis phenomenon
normal distribution function
