不同干密度下非饱和土土-水特征曲线

发布时间：2018-04-17 10:35

本文选题：非饱和土 + 土-水特征曲线　；参考：《中南大学学报(自然科学版)》2017年03期

【摘要】：对吸湿与脱湿过程中引起非饱和土土-水特征曲线进行分析,观察不同密度土样的土-水特征曲线与滞后现象。利用Fredlund and Xing的土-水特征曲线模型对试验数据进行拟合,得到模型拟合参数与土-水特征曲线参数的定量关系。研究结果表明:进气值随着参数a的增大而线性增大,残余基质吸力随着参数m的增大而呈幂函数减小,减湿率随着参数n的增大而呈指数减小。干密度对土-水特征曲线有显著影响。随着干密度增大,残余基质吸力与进气值及进水值增大,减湿率减小,滞后现象的显著程度降低。瓶颈效应、不同的接触角和空气体积是造成滞后效应的主要因素。
[Abstract]:On the sorption and desorption process caused by soil water characteristic curve of unsaturated soil water characteristic curve analysis, observation of different density of soil and soil by using Fredlund and Xing hysteresis. The soil water characteristic curve model of test data fitting, the quantitative relationship between model parameters and soil water characteristic curve parameters. The results show that the parameters of a with the intake value increases linearly, the residual matric suction increases with parameter m and a power function is reduced, humidity reduction rate with the increase of parameter n decreases exponentially. The dry density has a significant influence on soil water characteristic curve. With the increase of dry density, residual matric suction and the water intake and increased humidity reduction rate decreased significantly reduced. Degree of hysteresis of the bottleneck effect, contact angle and different air volume are the main factors causing the lag effect.

【作者单位】：东京大学土木工程系;
【基金】：国家自然科学基金资助项目(10772205)~~
【分类号】：TU43

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