Meyer Judgment Sealed

 

tecténic

geotechnical & environmental engineers

 

METHOD OF SOIL DESCRIPTION
USED ON LOGS

 

CLASSIFICATION AND INFERRED STRATIGRAPHY

Soil is classified and described in borehole and test pit logs using the preferred method given in AS1726 — 2017.

The material properties are assessed in the field by visual/tactile methods.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Particle Size Plasticity Properties
prior | Sub Division Particle Size
BOULDERS > 200 mm a T
COBBLES 63 to 200 mm
Coarse 19 to 63 mm e me
GRAVEL Medium 6.7 to 19 mm z |
Fine 2.36t06.7mm | = t
Coarse 0.6 to 2.36 mm 2 hateeet |
SAND Medium 0.21 to 0.6 mm z rt |
Fine 0.075 to 0.21 mart | |
SILT 0.002 to 0.075 : fi foe] Pipi Pi yi iy
CLAY < 0.002 mm LUOUID LIT
NOTE: The U line is an approximate upper bound for most materials.
Data which plot above the U line may represent unusual/problem soil
behavior, or unreliable data and should be considered carefully.
MOISTURE CONDITION AS1726 - 2017
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.
Ww Wet Soils exude free water. Sands and gravels tend to cohere.
CONSISTENCY AND DENSITY AS1726 - 2017
Symbol Term Undrained Shear Symbol Term Density Index % SPT “N’ #
Strength
vs Very Soft 0 to 12 kPa VL Very Loose Less than 15 Oto4
Ss Soft 12 to 25 kPa LE Loose 15 to 35 4 to 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 — 2017, and may be subject to corrections for overburden pressure and

equipment type.

 

 

Revl
October 2017

75