中文摘要：

通过＂锅盖效应＂室内试验研究试验时间和初始含水率对土体水气迁移的影响。试验结果表明：试验时间越长,水气迁移现象越明显。土体初始含水率较低时,水气迁移现象较弱;初始含水率适中时,水气迁移的现象较显著,当土体初始含水率继续增大,水气迁移现象发生减弱;当初始含水率超过某一界限含水率时,水气迁移的现象彻底消失。经分析试验规律,提出：非饱和土体中的连通孔隙是水气迁移的必要条件,含水率过高时,大量液态水导致土体孔隙非连通,水分迁移的通道被阻断,水气迁移现象不再发生。

英文摘要：

The influence of the test period and initial water content on the moisture migration is studied by the laboratory test. The test results showed that the moisture migration was more obvious as the test period increasing.The phenomenon would be weak when the initial water content was small,and the moisture migration would be obvious when the initial water content was moderate. The moisture migration began to weaken as the initial water content keeping rising and disappeared thoroughly when the initial water content was more than some critical water content. It was put forward according to analyzing the test results that the connected pores in the unsaturated soil are necessary for the moisture migration. The water will block the connected pores,and the moisture migration is also prevented when the water content rises to its critical value.