The Influence of Confining Stresses on Rock Fragmentation, Thrust Force, and Penetration Energy in Sandstone Indentation Tests Using Disc Cutters

Figure 14

Crack development on the cross section under V shape disc cutter with 6 mm penetration.Confining stress: (a) 0 MPa; (b) 3 MPa; (c) 6 MPa; (d) 9 MPa.

(a)

(b)

(c)

(d)