EXPERIMENTAL STUDY ON VAPOROUS WATER TRANSFERENCE IN LOESS AND SANDY SOIL

Moisture migration in unsaturated soil is normally presented in two ways:liquid water transfer and vaporous water transfer. On the condition of constant temperature,whether vaporous water transfer in unsaturated soil can be ignored remains to be settled. By taking loess samples and sandy soil samples for test,vaporous water transfer in unsaturated soil on the condition of constant temperature is studied;and the relation between vaporous water transferring quantity and liquid water transferring quantity in unsaturated soil is explored too. After analyzing the test data,it is showed that types of soil,water content value and water content gradient in soil all affect vaporous water transfer,and the influence of density of soil on vaporous water transfer can be ignored. If soil water mainly is bound water,and a water content gradient is exerted on the soil,it can be found that vaporous water transferring quantity is greater than liquid water transferring quantity. Conversely,if there is more free water in soil,vaporous water transferring quantity is less than liquid water transferring quantity.