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从土颗粒间形如液桥的水分毛细力认识和解释非饱和土的水力特性日趋为土力学界所关注。为研究固-液接触角对粗颗粒间液桥毛细力的影响,将粗颗粒简化为一对不等径球体颗粒,假定液桥的形状为圆环且不考虑颗粒重力和浮力的影响,结合液体被粗颗粒完全和不完全浸润两种情况提出了考虑固-液接触角影响的液桥毛细力联合迭代算法。随后研究了固-液接触角、液桥体积和颗粒半径比对毛细力与颗粒间距的无量纲关系的影响。最后利用已有文献中考虑固-液接触角时不等径球体颗粒间液桥的毛细力实测值对该算法进行了验证,通过计算液桥毛细力预测值与实测值之间的均方根误差发现联合迭代算法在表征液桥毛细力与颗粒间距关系时优于已有公式。
Understanding and explaining the hydraulic characteristics of unsaturated soils from the fine capillary forces of soil particles such as the liquid bridge is increasingly concerned by the geotechnical community. In order to study the influence of solid-liquid contact angle on the capillary force of coarse fluid bridges, the coarse particles are simplified as a pair of unequal-diameter spherical particles. Assuming that the shape of the liquid bridge is a ring without considering the effects of gravity and buoyancy, The liquid is completely and incompletely infiltrated by the coarse particles, the joint iteration algorithm of liquid-bridge capillary force considering the influence of solid-liquid contact angle is proposed. The effects of solid-liquid contact angle, liquid bridge volume and particle radius ratio on the dimensionless relationship between capillary force and particle spacing were investigated. Finally, the algorithm was verified by using the measured values of the capillary force of the liquid bridge between the particles of different diameters in the existing literature, and the root mean square The error found that the joint iterative algorithm is superior to the existing formulas in characterizing the relationship between liquid capillary force and particle spacing.