Experimental Study On The Structure And Adsorption Characteristics Of Loess Oriented To Wetting Function

Wetting plays a very important role in the seepage of loess.In the process of loess collapsibility,great changes of moisture content,humidity of particle surface and pore size,shape and arrangement have taken place,which affects the adsorption of particles on moisture and water infiltration law.In order to explore the internal mechanism of the unsaturated loess wetting and deep penetration furtherly,and analysis the force in the process of movement of capillary water,the specific surface area,contact angle and the adsorbability of water to loess were tested.Through theoretical analysis and experimental research,we have achieved some results:(1)There is a linear relationship between the specific surface area and dry density of undisturbed loess,the pore is mainly distributed in the interval of 0.01 to 10 ?m;the volume of macropore and mesopore decreases with the increase of dry density,the volume of small pore increases with the increase of dry density and then decreases,the volume of micropore was the largest,but the change was smaller with the dry density.(2)The apparent contact angle of loess is bigger than that of natural moisture in dry condition,and there is a significant linear positive correlation with the dry density,and the apparent contact angle decreases linearly with the macropore and mesopore,increased linearly with the micropore,but the change curve of small pore is a parabola.(3)This paper presents a method of measuring soil water interface adhesion and self adhesion tester,the experimental results show that the adhesion force of the undisturbed loess is higher than that of the natural moisture content,and the adhesive force decreases with the increase of depth and moisture content.(4)It is suggested that the adhesion force should be increased in the capillary water rising equilibrium model in the traditional soil mechanics,and two different correction methods are proposed.