<p>In order to analyze the mechanical properties of the structural surface under different shear rates, a series of constant shear rate tests and variable shear rate tests were carried out on the regular toothed structural surfaces cast with cement mortar under different normal stresses. The results indicate that the shear displacement curves can be divided into four stages. Moreover, the shear strength of the specimens increases with an increase in the structural surface angle and normal stress, regardless of whether it is a constant shear rate or variable shear rate. Among these tests, the shear strength of the Type B variable shear rate test is the highest, while that of the Type C test is the lowest, and the result of the constant shear rate test falls in between. For Type B and Type C tests, the shear stiffness <i>k</i>_s1 and <i>k</i>_s2 increase with increasing structural surface angle and under normal stress, exhibiting an approximately linear correlation. The coefficients of variation (CVs) of the internal friction angle and cohesion for the different shear rate tests are 12.8% and 38.6%, indicating that the shear rate is more influential on cohesion, but not as influential on the internal friction angle. Furthermore, as the shear rate increases, the internal friction angle and cohesion generally decrease and then increase. Accordingly, an empirical formula for shear strength and shear rate is suggested. The results will provide some references for the stability analysis of tunnels, slopes and faults.</p>