BS 8002:2015

Clay, IP 80, medium strength

BS 8002:2015, Figures 1–2, Table 2 — typical valuesRevision 1

Use it in Slope

In a design, add it from Materials → Quick add → Built-in soils. The material keeps this citation, and the PDF report prints its caveats.

Typical values — not a substitute for site investigation.

Values

Value	SI	Imperial	Source range
γ	20.5 kN/m³	130.5 pcf	γ 16.5–20.5 kN/m³
γsat	20.5 kN/m³	130.5 pcf	γsat 16.5–20.5 kN/m³
c′	0.0 kPa	0.0 psf	—
φ′	18.0°	18.0°	—

φ′cv = 18° at IP 80 % (Table 2; equation (7) gives 18.2°).
γ and γsat 16.5–20.5 kN/m³ (clay, medium undrained strength, Slope's choice; Figures 1–2).
c′cv = 0 (cl 4.3.1.4.9).

Other undrained-strength classes (Figures 1–2, kN/m³): very low 14–18, low 15–19, high 18–22, very high 18.5–23.5 above / 19.5–23.5 below, extremely high 21–24.

For use in the absence of reliable test results (BS 8002 cl 4.3.1.4.2 and 4.3.1.4.8).
The preset's unit weights are the top of the source's range, a default to check against the case: BS 8002 asks for the superior or inferior value by its effect (cl 4.3.1.3.4 / 4.3.1.4.4), and which bound is unfavourable depends on the loading and groundwater.
Where pre-existing slip surfaces exist, residual strength may govern (BS 8002 cl 4.3.1.4.11).
The preset leaves the AS 4678 soil condition at in situ; for a placed fill set the material's soil condition to match (some AS 4678 modes, such as direct sliding across a layer, are not given for in-situ soil).