Geoguide 1 (Hong Kong)

Colluvium, matrix (Hong Kong)

Geoguide 1, Table 8 — 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 15–21 kN/m³
γsat	21.6 kN/m³	137.5 pcf	—γsat derived (Gs 2.65), not given by the source.
c′	0.0 kPa	0.0 psf	c′ 0–10 kPa
φ′	26.0°	26.0°	φ′ 26–40°

γ 15–21 kN/m³ (bulk), φ′ 26–40°, c′ 0–10 kPa (Table 8).
γsat = γd·(1 − 1/Gs) + γw = 19·(1 − 1/2.65) + 9.81 = 21.6 kN/m³, γd at the top of Table 8's 13–19 kN/m³ (Slope's choice).

For use in the absence of reliable test results (Geoguide 1 section 5.3).
For general guidance only, at the stress levels of retaining-wall design, and usable in preliminary design (Geoguide 1 Table 8 note 1; section 5.3).
The preset's unit weights are the top of Geoguide 1 Table 8's range, a default to check against the case: which bound is unfavourable depends on the loading and groundwater (Slope's choice).
Wide ranges reflect the variable composition of colluvial matrix material (Table 8 note 7).
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).