Fig.8

Rock failure pattern: (a) Undisturbed rock failure form (b) 8 MPa disturbed rock failure form (c) 14 MPa disturbed rock failure form (d) 20 MPa disturbed rock failure form.
Rock failure pattern: (a) Undisturbed rock failure form (b) 8 MPa disturbed rock failure form (c) 14 MPa disturbed rock failure form (d) 20 MPa disturbed rock failure form.