非饱和黄土的接触角与孔隙特征试验

接触角及孔径是影响土壤润湿性、渗透性及毛细作用的重要因素。为了进一步认识非饱和黄土的毛细特性及渗透性，进行了非饱和黄土的接触角测试及压汞试验，对黄土孔隙体积与接触角的关系进行了分析，探讨了孔隙、接触角随深度的变化规律。研究发现，干燥状态下黄土的接触角高于天然状态下黄土的接触角；随着地层深度的增加，接触角增大；接触角与大、中孔隙体积为负相关关系，与微孔隙体积为正相关关系。在地层浅部，接触角与小孔隙体积为正相关关系，而对于深部地层，接触角与小孔隙体积为负相关关系；非饱和黄土中小孔隙及微孔隙含量较大，大、中孔隙含量相对较少。 

Experimental study on contact angle and pore characteristics of unsaturated loess

Contact angle and pore size are important factors affecting soil wettability, permeability and capillarity. In order to further understand the capillary characteristics and permeability of unsaturated loess, the contact angle test and mercury intrusion test of unsaturated loess were carried out. The relationship between pore size and contact angle was analyzed in details. Moreover, the variation of pore and contact angle with depth was discussed. It is found that the contact angle of loess in the dry state is higher than the contact angle of loess in the natural state; as the depth of the formation increases, the contact angle increases; the contact angle is negatively correlated with the large and medium pore volume, whereas is positively correlated with the micropore volume. Additionally, in the shallow part of the stratum, the contact angle is positively correlated with the small pore volume, while for the deep stratum, the contact angle is negatively correlated with the small pore volume. In unsaturated loess, the content of small pores and micropores is relatively large, while the content of large and medium pores is relatively small.