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A review of literature on surface morphology of rock joints indicated that the surface morphology of rock joints is a crucial factor for evaluating the stability of rock mass engineering, which have not quite got the particular attention of research scholars yet. Hence, this paper aims to study the shear characteristics of the saw tooth. Firstly, we can procure the material that has similar physio-mechanical properties as rock through testing the ratios of different raw materials, such as gypsum, gypsum retarder, and water. Then, according to the plan of design, 3 different numbers of joint specimens of saw teeth i-e (flat, ten teeth, and twenty teeth) were casted using designed molds. Finally, applying developed shear test apparatus to conduct laboratory shear tests. And for the purports of study the stress effect of rock joints, the normal stress be set 6 levels, such as 10kPa, 25kPa, 50kPa, 70kPa, 80kPa, 100kPa. The results showed that there are stress effects on peak shear strength, peak friction angle and peak shear displacement of saw tooth joint surface. And when there is the same length and filled saw tooth on joint surface, (τpτr) of the more the number of saw teeth is less than less number of saw teeth, and (τpτr )of the flat jointed surface is less than the saw toothed joint surface.

Study on Stress Effect of Shear Properties of Joint Surface with Saw Tooth