1. Simulation of Pillar Failure Using FRACOD 2D

2. Objective n To test the capability of FRACOD 2D in predicting failure of a pillar between two rock excavations

3. Main parameters n Failure criterion: Mohr-Coulomb n Tensile strength = 9MPa n Cohesion=17MPa n Friction angle rock  =30º n K IC =1.46 MPa m 1/2 ; K IIC =6.53 K IC E=40GPa,  =0.25 E=40GPa,  =0.25 n Fracture contact properties: JKs=JKn=10e4GPa/m; friction angle=30 degrees, cohesion=0

4. Pillar width 10 m Excavation width 10 m 20 m S y =43MPa S X =18 MPa

5. Fracture initiation in shear

6. Tensional fracture propagation

8. Mixed mode fracture propagation

10. Fracture propagation mainly in shear

17. Displacements

20. Maximum Displacement 11 mm

21. Maximum Displacement 12 mm

22. Maximum Displacement 13 mm

23. Maximum Displacement 14 mm

24. THANK YOU!