INFLUENCE OF CEMENT CONTENT AND MOISTURE CONTENT ON THE PULLOUT-INTERFACE PROPERTIES OF GEOGRID-SOLIDIFIED WASTE MUD

In engineering, waste mud is often used as a filling material after a solidification treatment. Geogrids, being excellent geotechnical engineering materials, are often used for soil reinforcement. In this work, a pullout test that considered the influence of different waste-mud moisture contents and cement contents was conducted to investigate the interface characteristics of geogrid-solidified waste-mud-reinforced soil. Then, the relationship between the pullout force and displacement, and the variations in the cohesion, friction angle and quasifriction coefficient were analysed. The results showed that the pullout force-displacement curve represented a strain-softening pattern. With the increasing moisture content, the peak pullout force, interfacial cohesion and quasifriction coefficient decreased gradually, but the internal friction angle did not change substantially. With the increasing cement content, the peak pullout force, interfacial cohesion, internal friction angle and quasifriction coefficient increased gradually. The peak pullout force was linearly correlated with the change in the moisture content and logarithmically correlated with the change in the cement content. Compared with the moisture content, the reinforcement-soil interface was more affected by the cement content. This study provides guidelines for the mixture design of reinforced solidified waste mud.