非饱和膨胀土水分迁移的试验研究

Experimental Analysis of Water Transference in Unsaturated Expansive Soil

在等温条件下,分组对不同初始干-湿段土体含水量、不同时间间隔对非饱和膨胀土的气态水迁移和气液态水混合迁移的规律及其关系进行试验研究,揭示了其随时间的变化过程。试验结果表明,土质情况、含水量水平及含水量梯度对其有重要影响,气态水迁移量与气液混合迁移量都随含水量梯度增加而增加,与时间和位置呈复杂的非线性关系;含水量较小时,土粒对水分的吸附能力较强,致使含水量梯度较大,含水量较大时,土粒周围自由水较多,水分分布较均匀。

On the condition of constant temperature,grouping dry-wet soil with different initial water content and different time intervals,the experiments were carried out to study vaporous transfer,vaporous-liquid transfer and the relationship of unsaturated expansive soil.And it was found that the soil behavior,water content and water content gradient were pivots for the transfer.Vaporous transfer,vaporous-liquid transfer were increased with the increase of moisture gradient in a complex non-linear relationship with times and locations.And with the less water,the adsorption capacity of soil was strong,resulting in larger gradient of moisture.While for larger water content,free water was more with more even of the moisture.