geotechnical report

LEGEND

 

Soil description (AS1726 — The Geotechnical

Site Investigation Code)

 

GW -— Well graded gravels, little or no fines

GP — Poorly graded gravels, little or no fines

 

GM - Silty gravels

GC — Clayey gravels

 

SW — Well graded sands, little or no fines

SP — Poorly graded sands, little or no fines

 

SM - Silty sands

SC — Clayey sands

 

ML — Inorganic silts and very fine sands

OL — Organic silts and organic silty clays

 

CL — Inorganic clays of low plasticity

CI — Inorganic clays of medium plasticity

 

CH — Inorganic clays of high plasticity

OH — Organic clays medium/high plasticity

 

Pt — Peat and other highly organic material

 

Ls — Linear Shrinkage %

 

Note

The stratifications identified on our log sheets are representative of the approximate boundary
between soil types and the transition may be gradual and vary over the site.

 

 

Abbreviations

 

Dk — Dark, Lt—Light, Gy -— Grey, Rd — Red

, Br—Brown, Or — Orange, Mott — Mottled.

 

LP, MP, HP - Low, Medium, High Plasticity.

SW - Slightly Weathered Rock.

 

P (p) — blows/100 mm approved penetrometer

DW - Distinctly Weathered Rock.

 

UTP — Unable to penetrate

 

EW - Extremely Weathered Rock.

 

 

Cohesive Soil Strengths approximate safe bearing capacities for clay-based soils.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Very soft (VS) —<25 kPa Soft (S) — 25 to 50 kPa Firm (F) — 50 to 100 kPa
Stiff (St) — 100 to 200 kPa Very Stiff (VSt) — 200 to 400 kPa Hard (H) — 400+ kPa
Soil Strengths Sands and Gravels
Density SPT “N” value Relative Density (%)
Very Loose (VL) <4 <15
Loose (L) 4-10 15-35
Medium Dense (MD) 10 —30 35-65
Dense (D) 30-50 65 — 85
Very Dense (VD) >50 > 85
Particle Sizes. Prefix Range of Sizes (mm)
Boulder - > 200
Cobble - 63 — 200
Coarse 20-63
Gravel Medium 2-20
Fine 0.6 — 2.0
Coarse 0.2—0.6
Sand Medium 0.075 — 0.2
Fine 0.002 — 0.075
Clay < 0.002 .

 

 

 

Moisture Condition

 

 

 

 

 

Dry Looks and feels dry, clay soils are normally hard, powdery or friable.
Moist Feel cool, darkened in colour, no free water on hands when remoulding.
Wet Soils are weak, free water can occur; granular soils bind together, clay softened.

 

 

Unearthed Geotechnical P/L.

Site Investigation Report 022-003