Influence of Morphology Characteristics on Shear Mechanical Properties of Sawtooth Joints

The interface problem exists widely in building. Joints are interfaces of rock mass structures. To further study the influence morphological characteristics on shear mechanical properties sawtooth joints, this paper prepared rock-like materials based similarity principle and carried out direct tests joints. results showed that: (1) peak displacement joints first increases then decreases with increasing normal stress, but trend stress during turning is different under angles. When angle small, decrease between strength residual not obvious, rate also small. (2) positively correlated stress. Using Mohr–Coulomb criterion to analyze it was found that cohesion c internal friction ? increased nonlinearly angle, their trends were different. By introducing function relation cohesion, into classical equation, an empirical equation for established consideration angle. (3) There two modes failure serrated joints: “saw-toothed sliding gnawing mechanism” (SSG) “tensile fracture (TFM). In SSG, mode evolves a slipping–gnawing–complete mechanism TFM mainly occurs at high This provides theoretical reference prediction prevention geological disasters.