土壤中粗细不同的毛细管孔隙连通一起形成复杂的毛细管体系。当土壤含水量逐渐增大，超过最大分子持水量的那部分水，在毛细管力的作用下，保持在土壤的毛细管孔隙中，不受重力作用的支配，这种靠毛细管力保持在土壤毛细管孔隙中的水就称为毛细管水。
结果表明，非饱和黄土的水分特征曲线可用幂函数关系描述；吸着水含量与毛细管水含量随基质吸力的增大而减小；基质吸力由吸着力和毛细管力形。
The water content of attraction and capillary decreased with the increase of the matrix suction, which consisted of attraction and capillary powers.
在浮力、水动力和毛细管力的共同作用下，油（气）呈间歇性运动，这在物理模拟实验中已得到证实。
Under the joint action of buoyancy, hydrodynamic force and capillary power, oil (gas) moves intermittently. This has been verified in the physical simulation experiment.
土壤粘附强度主要由毛细管作用力和界面水膜粘滞力构成，固体表面性质对其产生影响。
The soil adhesive strength is mainly composed of capillary pressure and viscous resistance of the water film, which are affected by the nature of solid surface.
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