Table 1

. Soil data derived from tests on the borehole samples and used in slope stability analyses.

StrataDepth, h: feet (m)Moisture Content, w: %Liquid Limit, LL: %Plasticity Index, PI: %Dry Density, ρ: pcf (Mg/m3)Direct Shear Cohesion Intercept, c′: psf (kPa)Direct Shear Angle of Internal Friction, ϕ: o
silty Clay2 (0.6)16.5–19.847–5828–36105 (1.682)100 (5)12
Weathered Limestone10 (3.0)115 (1.842)100 (5)20
shaly Clay18 (5.5)16.5–22.852–7131–44108 (1.730)100 (5)14
clayey ShaleBase21.256–6331–36118 (1.890)250 (12)20
Tyre Bales (Estimated)N/A45 (0.721)750 (36)35
Tyre Bales (Measured: Zornberg 2004)N/Aϕϕϕ36.7±4 (0.588±0.064)a32 (1.5)35.9
  • a The bulk (wet) density has been measured as 47.1±5 pcf (or 0.755±0.081 Mg/m3)