The ground freezing method is a construction technique used to support earth pressure and hydraulic pressure during excavation. It is crucial that this method ensures adfreeze―the adhesion between the frozen ground and the structure ―in order to prevent gaps from forming. However, the adfreeze mechanism is not yet fully understood or widely applied in practical construction. Additionally, some factors that affect the strength of adfreeze remain unclear. In this study, we conducted direct shear test to evaluate the adfreeze strength. Eight with different surface roughness levels ware used. The adfreeze occurred between the iron disk and the soil, and the shear strength at their interface was measured using the direct shear test. As a result, it was found that the shear strength of the adfreeze increased with greater surface roughness.
