Mesoscopic Study on Pullout Test of Reinforcement with Ribs Based on Particle Image Velocimetry

Abstract

Particle image velocimetry (PIV) technology is a kind of non-intrusive, instantaneous, dynamic technique to measure the planar distribution of velocity in the fluid based on the cross-correlation. By applying PIV technology to the pullout test of horizontal reinforcement with ribs-sand interface, sand particle movements can be measured in the process of testing from the mesoscopic view. Meso-characteristics of displacement vector near the interface will be discussed. Furthermore, a quantitative analysis is made of the changes of horizontal and vertical displacement with pullout displacement. Thereby, interface interaction mechanism of 3D reinforcement-sand is further revealed from a microscopic viewpoint. The result showed that the vertical inclusions of the reinforcement played important roles in interface characteristics. The movement of sand particles formed a flow field. The failure surface was wavy-shaped between the two ribs. Horizontal displacement was larger than vertical displacement of sand particles near the interface. The impact area of 3D reinforcement was larger than that of traditional horizontal reinforcement. The pullout resistance acting on the front rib was larger than that on the second rib.