Simulation of Pillar Failure Simulation of Pillar Failure Using Using

FRACODFRACOD2D2D

ObjectiveObjective

To test the capability of FRACODTo test the capability of FRACOD2D2D in in predicting failure of a pillar between two rock predicting failure of a pillar between two rock excavationsexcavations

Main parametersMain parameters

Failure criterion: Mohr-Coulomb Failure criterion: Mohr-Coulomb Tensile strength = 9MPa Tensile strength = 9MPa Cohesion=17MPaCohesion=17MPa Friction angle rock Friction angle rock =30º =30º KKICIC=1.46 MPa m=1.46 MPa m1/21/2; K; KIICIIC=6.53 K=6.53 KICIC

E=40GPa, E=40GPa, =0.25=0.25 Fracture contact properties: JKs=JKn=10e4GPa/m; Fracture contact properties: JKs=JKn=10e4GPa/m;

friction angle=30 degrees, cohesion=0friction angle=30 degrees, cohesion=0

Pillar width

10 m

Excavation width 10 m

Excavation width 10 m

20 m

SSyy=43MPa=43MPa

SSXX=18 MPa=18 MPa

Fracture initiation in shear

Tensional fracture propagation

Tensional fracture propagation

Mixed mode fracture propagation

Mixed mode fracture propagation

Fracture propagation mainly in shear

Fracture propagation mainly in shear

Fracture propagation mainly in shear

Fracture propagation mainly in shear

Fracture propagation mainly in shear

Fracture propagation mainly in shear

Fracture propagation mainly in shear

DisplacementsDisplacements

Maximum Displacement 11 mm

Maximum Displacement 12 mm

Maximum Displacement 13 mm

Maximum Displacement 14 mm

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