Table 6.

φsliding values for discontinuities typically found in the weathering profile of an area with iron-dissolution and precipitation per iron-precipitation type and rock mass weathering grade

Rock mass weathering grade*Sliding criterion parameterDescriptionφsliding (°)
RlRsIm
Cemented
 20.950.951.07Slightly wavy, rough stepped, cemented85
0.950.81.07Slightly wavy, rough undulating, cemented72
0.80.951.07Slightly curved, rough stepped, cemented72
0.750.951.07Straight, rough stepped, cemented67
0.850.81.07Curved, rough undulating, cemented64
0.750.81.07Straight, rough undulating, cemented57
0.750.81.07Straight, rough undulating, cemented57
0.80.651.07Slightly curved, rough planar, cemented49
0.750.651.07Straight, rough planar, cemented46
0.750.651.07Straight, rough planar, cemented46
 30.80.951.07Slightly curved, rough stepped, cemented72
0.750.951.07Straight, rough stepped, cemented67
0.80.81.07Slightly curved, rough undulating, cemented61
0.950.651.07Slightly wavy, rough planar, cemented58
0.750.651.07Straight, rough planar, cemented46
0.750.651.07Straight, rough planar, cemented46
0.750.651.07Straight, rough planar, cemented46
Coated
 210.950.9Wavy, coarse stepped, medium non-softening & sheared material76
0.950.950.95Slightly wavy, rough stepped, coarse non-softening & sheared material76
0.80.950.95Slightly curved, coarse stepped, coarse non-softening & sheared material64
0.750.950.95Straight, rough stepped, coarse non-softening & sheared material60
0.950.651Slightly wavy, rough planar, no infill55
0.750.81Straight, rough undulating, no infill53
0.80.80.9Slightly curved, rough undulating, medium non-softening & sheared material51
0.80.651Slightly curved, rough planar, no infill46
0.80.651Slightly curved, rough planar, no infill46
0.80.650.95Slightly, rough planar, coarse non-softening & sheared material44
0.750.651Straight, rough planar, no infill43
0.750.651Straight, rough planar, no infill43
0.750.650.9Straight, rough planar, medium non-softening & sheared material39
 310.80.9Wavy, rough undulating, medium non-softening & sheared material64
0.80.950.95Slightly curved, rough stepped, coarse non-softening & sheared material64
0.950.650.95Slightly wavy, rough undulating, coarse non-softening & sheared material52
0.80.80.9Slightly curved, rough undulating, medium non-softening & sheared material51
0.950.650.9Slightly wavy, rough undulating, medium non-softening & sheared material49
0.950.650.9Slightly wavy, rough planar, medium non-softening & sheared material49
0.750.80.9Straight, rough undulating, medium non-softening & sheared material48
0.750.80.9Straight, rough undulating, medium non-softening & sheared material48
0.80.650.95Slightly curved, smooth undulating, coarse non-softening & sheared material44
0.80.650.9Slightly curved, rough planar, medium non-softening & sheared material41
0.750.650.95Slightly curved, rough undulating, coarse non-softening & sheared material41
0.750.650.9Straight, rough planar, medium non-softening & sheared material39
Stained
 00.950.91Slightly wavy, smooth stepped, no infill76
0.950.751Slightly wavy, smooth undulating, no infill63
0.80.751Slightly curved, smooth undulating, no infill53
 10.750.751Straight, smooth undulating, no infill50
0.80.651Slightly curved, smooth undulating, no infill46
0.750.61Straight, smooth planar, no infill40
 20.950.80.85Slightly curved, rough undulating, fine non-softening & sheared material57
0.950.80.65Slightly curved, rough undulating, medium soft sheared material44
0.950.650.65Slightly curved, rough planar, medium soft sheared material36
0.750.650.65Straight, rough planar, medium soft sheared material28
 30.80.80.85Slightly curved, rough undulating, fine non-softening & sheared material48
0.950.750.65Slightly curved, smooth undulating, medium soft sheared material41
0.750.650.85Straight, rough planar, fine non-softening & sheared material37
0.80.750.65Slightly curved, smooth undulating, medium soft sheared material35
0.80.650.65Slightly curved, rough planar, medium soft sheared material30
0.750.650.65Straight, rough planar, medium soft sheared material28
0.80.650.55Slightly curved, rough planar, fine soft sheared material25
0.750.650.55Straight, rough planar, fine soft sheared material24
0.750.650.55Straight, rough planar, fine soft sheared material24
0.750.60.55Straight, smooth planar, fine soft sheared material22
  • Notes: *Rock mass weathering grades follow Table 2.

  • Rl, Rs and Im values and descriptions follow Hack et al. (2003); Ka = 1.00 for all options.

  • φsliding (sliding angle) is determined using equation (3).