BS 8002:2015

Silt, IP 10

BS 8002:2015, Figures 1–2, equation (7) — 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	21.0 kN/m³	133.7 pcf	γ 15.5–21 kN/m³
γsat	21.5 kN/m³	136.9 pcf	γsat 18–21.5 kN/m³
c′	0.0 kPa	0.0 psf	—
φ′	29.5°	29.5°	—

φ′cv = 42° − 12.5 log₁₀(10) = 29.5° (equation 7; IP 10 is not in Table 2).
γ 15.5–21 kN/m³ above and γsat 18–21.5 kN/m³ below the water table (silt; Figures 1–2).
c′cv = 0 (cl 4.3.1.4.9).

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).