非饱和土实用化研究中的参数选择分析

Analysis of Parameter Choice in Unsaturated Soil Practical Researche

考虑吸力的非饱和土研究较为精确,但吸力量测起来比较困难。以含水率或饱和度作为参数的非饱和土实用化研究更有利于工程的实际应用。然而以含水率或饱和度作参数也有其自身的不足,基于细观理想球体颗粒模型,保持颗粒间水环体积不变,通过考察土体颗粒间相对位置发生变化时,各状态参数的变化情况来评价非饱和土实用化研究中状态参数选择的合理性,分析了在相同几何条件下,接触角变化对非饱和土中吸力的影响,提出了用湿密比作为状态参数代替传统的含水率或饱和度作参数法,并证明了湿密比在非饱和土实用化研究中作为状态参数的优越性。

It is precise for unsaturated soil study to use suction as a parameter, but it has certain difficulty in suction measurement. Using saturation or water content as a parameter in unsaturated soil research is convenient in practical application, but that also have drawbacks. Base on the ideal spherical particle model, the volume of water was kept unchanged. The parameters were evaluated while the spherical particles were in the relative movement state. Under the same condition, the effects of contact angle on suction were also analyzed. The method of using the ratio of water content to dry density （RWD） was proposed to instead of the method of saturation or water content. Finally, It can be concluded that the method of RWD is more convenient than saturation or water content in unsaturated soil practical research.