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Appendix B - Global Stability Assessment Report
Attached to the e-mail Operational Works Application - DA Form 1 - Town Planning Report - Global Stability Assessment Report - Earthworks Compaction Report - Erosion and Sediment Control Plan - 36 Tunba Court Cooroy Mountain.
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Brisbane | Gold Coast | Maroochydore
Unit 1, 35 Limestone Street (PO Box 3063), Darra Q 4076 P (07) 3279 0900
ABN 51 009 878 899
www.morrisongeo.com.au
ROCK DESCRIPTION AND CLASSIFICATION
CLASSIFICATION METHODS DEFECTS
Defects are fractures in the rock mass and include joints, faults, sheared
The rock classifications are broadly consistent with Australian Standard
planes, cleavages and bedding partings.
AS 1726, Geotechnical Site Investigation Code. Generally, rock is described by
the following: Types
J – Joint Cz – Crushed zone
Composition of rock material Rock name F – Fault Sz – Sheared zone
Grain size V – Vein Bz – Broken zone
Texture and fabric Fo – Foliation
Colour B – Bedding
Condition of Rock Material Strength
Weathering Defect descriptors
Rock Mass Properties Structure of rock
Roughness Planarity
Defects
Slickenside, visible evidence of Planar, no variation in
Slk Pl
striation orientation
STRENGTH Smooth, surface appears and
Point Load S Un Undulating, wavy surface
feel smooth
Term Symbol Index Is50 Field Guide Slightly rough, asperities on the
Stepped, well defined
(MPa) SR defect surface and St
steps present
Material crumbles under a firm blow with distinguishable and can be felt
sharp edge of pick; can be peeled with knife; Rough, some ridges and angle
Very >0.03 Irregular, many changes
VL too hard to cut a triaxial sample by hand. steps are evident, asperities Ir
Low ≤0.1 R in orientation
Pieces up to 3cm thick can be broken by are clearly visible and surface
figure pressure feels abrasive Aperture
Very Rough, near right angle o Open
Easily scored with a knife; indentations
VR steps and ridges occur on the
1mm-3mm show in the specimen with firm c Closed
defect surface
blow of the pick point; has dull sound under
Low L >0.1 ≤0.3 hammer. A piced of core 150mm long 50mm
diameter may be broken by hand. Sharp Type of Infilling Amount of Infilling
edges of core may be friable and break Cl Clay Cn Clean, no visible coating or infilling
during handling Surface stain, no visible coating or
Ca Calcite Su
Readily scored with a knife; a piece of core infilling but surfaces are discoloured
150mm long by 50mm diameter can be Veneer, a visible coating or infilling up to
Medium M >0.3 ≤1.0 Fe Iron Oxide Vn
broken by hand with difficulty rings under 1mm thick
hammer. Coating, visible coating or infilling up to
Qz Quartz Co
1mm thick
A piece of core 150mm long by 50mm Filled, coating or infilling greater than
diameter cannot be broken by hand but can CA Calcrete Fi
High H 1≤3 1mm thick with amount in millimetres
be broken by a pick with a single firm blow; Li Limonite
rock rings under hammer.
Si Silt Thick soil infilling to be described as seams
Very Hand specimen breaks with pick after more Uk Unknown
VH >3 ≤10
High than one blow; rock rings under hammer
Specimen requires many blows with TYPICAL ROCK TYPES
Extremely
EH >10 geological pick to break through intact Refer to AS1726 Table 15,16 and 17 for guide to naming of rocks.
High
material; rock rings under hammer
Conglomerate
WEATHERING Breccia
Designation Symbol Definition
Sandstone
Material is weathered to such Greywacke
Extremely Weathered XW an extent that is has soil Mudstone
properties. Siltstone
Highly
Rock strength usually changed Claystone
HW by weathering. The rock may
Sedimentary
Weathered Limestone
be highly discoloured, usually Shale
Distinctly
DW ironstaining. Porosity may be Dolomite
Weathered
Moderately increased by leaching or be
Weathered
MW
decreased due to deposition of
Shale
weathering products in pores Tuff
Rock is slightly discoloured but Chert
Slightly weathered SW shows little or no change of Coal
strength from fresh rock Gniess
Rock shows no sign of Marble
Fresh Rock FR
decomposition or staining Schist
Quartzite
TEXTURE AND FABRIC Metamorphic
Serpentinite
The texture and fabric of a rock specifically refers to the arrangement of the Phyllite
constituent grains or crystals in a rock.
Slate
Bedding Term Thickness
(mm) Hornfels
Granite
Extremely thickly bedded >6000
Diorite
Very thickly bedded 2000-6000 Gabbro
Thickly bedded 600-2000 Igneous Dolerite
Medium bedded 200-600 Rhyolite
Andesite
Thinly bedded 60-200
Basalt
Very thinly bedded 20-60
Laminated 6-20
Very Thinly Laminated <6
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