Rocscience Rs2 Crack Top [hot] Direct

| Step | Action | Tips / Gotchas | |------|--------|----------------| | | Create a rectangular block. In Geometry → Add use Box → dimensions 30 × 30 × 20 m. | Keep the block large enough (≥ 3× the expected zone of influence) to avoid boundary effects. | | 2. Mesh | Use Mesh → Automatic with max element size ≈ 1 m for a quick run, then refine to 0.25 m near the joint. | A finer mesh around the crack improves convergence of contact stresses. | | 3. Material | Assign a Mohr‑Coulomb or Hoek‑Brown rock mass. Example: σc = 10 MPa, σt = 2 MPa, φ = 35°, c = 0.5 MPa. | If you have lab data, feed it into Material → Rock to get realistic GSI‑based parameters. | | 4. Define the Crack | Discontinuities → Add → Crack‑Top . • Location : Z = 10 m (horizontal). • Thickness : 0.001 m (a “thin” interface). • Stiffness : Normal = 10⁸ kN/m³, Shear = 5 × 10⁷ kN/m³. | The stiffness values can be calibrated from joint shear tests. If unsure, start with a high normal stiffness (almost “rigid”) and a lower shear stiffness. | | 5. Contact Properties | Set Cohesion = 0 , Friction Angle = 30° , Tensile Strength = 0 (pure sliding joint). Enable Contact Damping (≈ 0.05) to aid convergence. | Zero cohesion makes the joint pre‑existing . If you want a partially bonded joint, give it a small cohesion (e.g., 0.2 MPa). | | 6. Boundary Conditions | • Bottom face: Fixed (Uₓ = U_y = U_z = 0). • Lateral faces: Roller (Uₓ = U_y = 0). • Top face: Apply vertical stress (30 MPa) and a point load at the center (e.g., 200 kN). | Use Loads → Uniform for stress and Loads → Point for the concentrated load. | | 7. Crack‑Top Release | Check Release Top Surface if you want the surface to detach from the joint after a certain displacement. | This is optional; keep it unchecked for a “fixed‑top” scenario. | | 8. Solver Settings | Choose Static analysis, set Maximum Iterations = 200, Convergence Tolerance = 1e‑5, and enable Adaptive Time Stepping . | If you get “non‑convergent” messages, lower the load increment or increase damping. | | 9. Run & Post‑process | After the solution finishes, view Displacements , Stress Contours , and especially Crack‑Top Shear Traction and Normal Gap . | Use Plot → Crack‑Top to see opening (positive gap) vs. sliding (shear traction). |

RS2, formerly known as Phase2, is a 2D finite element software used for rock and soil modeling, developed by Rocscience Inc. The software is widely used in geotechnical engineering for simulating the behavior of underground excavations and rock structures. The "Crack Top" feature in RS2 refers to a specific aspect of rock mechanics modeling. rocscience rs2 crack top

RS2 by RocScience is a powerful tool for analyzing stress and deformation in rock masses, taking into account complex geological conditions and the presence of cracks and fractures. If you're working on a project involving rock mechanics, familiarizing yourself with RS2 and its capabilities could be highly beneficial. | Step | Action | Tips / Gotchas