On the efficiency of the modified smooth joint model for simulating shear behavior of rock joints: A comprehensive experimental-numerical study. Computers and Geotechnics

The Modified Smooth Joint (MSJ) model offers a robust approach for investigating the shear behavior of rock joints within a discrete element framework where joint profiles are explicitly simulated by applying SJ contacts. Although the model is widely used, its efficiency remains underexplored due to limited experimental validation. Previous assessments have predominantly focused on idealized saw-tooth joints, often overlooking the inherent complexity of natural joints. This research evaluates the MSJ model’s capability to simulate the shear behavior of rough rock joints through an integrated experimental–numerical investigation, addressing two fundamental questions: (1) To what extent can the model replicate the shear behavior of physically identical rough joints? and (2) Which roughness profiles better represent the shear behavior of natural rock joints, considering that multiple two-dimensional profiles can be …