Experimental Investigation of Interface Characteristics between Geogrid and Coarse-Grained Soil in a Seasonally Frozen Area

In seasonally frozen soil regions, the influence of temperature change on reinforced-soil engineering cannot be ignored. particular, mechanical properties interface have an important impact overall stability and long-term service performance reinforced engineering. To explore characteristics reinforcement mechanism between geogrids coarse-grained under negative temperatures, this paper takes typical in Xinjiang as material carries out a direct shear test reinforcement–soil different normal stresses, water contents temperatures. The curve displacement-shear stress, trend peak stress formation geogrid freezing nonfreezing conditions are thoroughly analyzed. dilatancy is explained by combining Mohr-Coulomb strength criterion apparent friction coefficient. It concluded that state basically same. low has no obvious peak, which closer to ideal elastic-plastic double linear model. high curves more peaks, type elastic-strain softening type. state, great correlation with content, state. main sources difference cementation pore ice skeleton improvement particles themselves, further interlocking effect soil. comparison nonfrozen significantly improved. (0 °C), (−5 °C) Under stresses 40 kPa, 60 80 when content 2%, corresponding increases 19.39%, 21.71% 11.34%, respectively. When 4.5%, decreases 29.98%, 16.17%, 13.83%. 7%, 50.85%, 18.64%, 21.96%. coefficient increasing stress. With decrease temperature, phenomenon composite obvious. research results can provide reference for construction seasonal areas.