STUDY ON THE EVOLUTION OF LIQUID BRIDGE FORCE BETWEEN FLAKY PARTICLES

Studying the liquid bridging force between particles can help reveal the internal mechanism of the water-holding properties of unsaturated soils. In order to explore the evolution law of the liquid bridge force between flaky particles and study the hydraulic characteristics of unsaturated soils from a meso-scale scale, the Surface Evolver software was used to construct a three-dimensional liquid bridge model between two parallel flaky particles, and the tension of the liquid bridge was analyzed. The influence of contact angle, liquid bridge volume, separation distance and the pinning effect of the solid-liquid contact line on the law of the change of the liquid bridge force during the process. Based on the arc assumption, calculate the liquid bridge force and the size of the contact radius under the corresponding conditions, and compare and analyze the results with the above simulation results. The results show that the liquid bridge force between flake particles increases with the increase of the liquid bridge volume, decreases with the increase of the separation distance, and first increases and then decreases or decreases with the increase of the solid-liquid contact angle; when the liquid bridge volume is constant In the pinning state, the force first increases rapidly with the increase of the separation distance, reaches the peak value, and then gradually decreases; the Surface Evolver simulation is compared with the calculation result of the annular approximation of the liquid bridge interface, when the solid-liquid contact angle is large (θ = 60° and θ = 80°), the relative error of the two is within 6%, and when the solid-liquid contact angle is reduced to 30° and below, the relative error increases, and the particles The greater the separation distance, the greater the relative error.