Experimental Investigation of the Peak Shear Strength Criterion Based on Three-Dimensional Surface Description

摘要: The three-dimensional (3D) morphology of joints is enormously important for the shear mechanical properties rock. In this study, scanning tests and direct are conducted to establish a new peak strength criterion. test results show that (1) surface normal stress exert significant effects on distribution damage area. (2) area located at steepest zone facing direction; as increases, it extends from toward less steep zone. Via analysis, formula apparent dip angle developed. influence average joint height potential contact discussed, respectively. A criterion, mainly applicable specimens under compression, established by using roughness parameters taking rock into account. comparison newly model with JRC–JCS Grasselli’s shows one could apparently improve fitting effect. Compared earlier models, simpler more precise. All in have clear physical meanings can be directly determined scanned data. addition, indexes used rational.