Appendix 5. Geotechnical Engineering Report [As Published] · 132007.2399

 

METHOD OF SOIL DESCRIPTION

 

 

 

 

 

 

 

 

 

 

 

 

Golder
Associates USED ON BOREHOLE AND TEST PIT REPORTS
FILL + _—_} CLAY (CL, Cl or CH)
Fe 29) GRAVEL (GP or GW) x* 4 ORGANIC SOILS (OL or OH or Pt)
o°q ly dy
Po oe _
“=| SAND (SP or SW) a COBBLES or BOULDERS
° o
Do.

 

 

 

 

 

yx] SILT (ML or MH)

 

 

 

Combinations of these basic symbols may be used to indicate mixed materials such as sandy clay.

 

CLASSIFICATION AND INFERRED STRATIGRAPHY
Soil and Rock is classified and described in Reports of Boreholes and Test Pits using the preferred method given in
AS1726 — 1993, Appendix A. The material properties are assessed in the field by visual/tactile methods.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Particle Size Plasticity Properties
Major Division | Sub Division Particle Size 40
BOULDERS > 200 mm cH
COBBLES 63 to 200 mm = 3 cow Sitety tn eye
Coarse 20 to 63 mm = oy clay
GRAVEL Medium 6.0 to 20 mm 3 20
Fine 2.0 to 6.0 mm 2 ign i it
Coarse 0.6 to 2.0mm 2 *
SAND Medium 0.2 to 0.6 mm a 10 A | eee
Fine 0.075 to 0.2 mm ST ‘en
SILT 0.002 to 0.075 mm 9 +
0 40 20 30 40 50 60 70 80
CLAY < 0.002 mm Liquid Limit (%)
MOISTURE CONDITION AS1726 - 1993
Symbol Term Description
D Dry Sands and gravels are free flowing. Clays & Silts may be brittle or friable and powdery.
M Moist Soils are darker than in the dry condition & may feel cool. Sands and gravels tend to cohere.
WwW Wet Soils exude free water. Sands and gravels tend to cohere.
CONSISTENCY AND DENSITY AS1726 - 1993
Symbol Term Undrained Shear Symbol Term Density Index % SPT “N’ #
Strength
VS Very Soft 0 to 12 kPa VL Very Loose Less than 15 0 to4
Ss Soft 12 to 25 kPa L Loose 15 to 35 4to 10
F Firm 25 to 50 kPa MD Medium Dense 35 to 65 10 to 30
St Stiff 50 to 100 kPa D Dense 65 to 85 30 to 50
vst Very Stiff 100 to 200 kPa VD Very Dense Above 85 Above 50
H Hard Above 200 kPa

 

 

 

 

 

 

 

 

 

In the absence of test results, consistency and density may be assessed from correlations with the observed behaviour of
the material.

# SPT correlations are not stated in AS1726 — 1993, and may be subject to corrections for overburden pressure and
equipment type.

 

 

GAP Form No. 5
RL7