Attachment 5 - Geotechnical Assessment · MCU18/0015

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RTI 11/055 Folio B429

 

TERMS FOR ROCK MATERIAL STRENGTH & WEATHERING
AND ABBREVIATIONS FOR DEFECT DESCRIPTIONS

Golder
Associates

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STRENGTH
Point Load
Symbol Term Index, Is(59) Field Guide
(MPa)
EL Extremely < 0.03 Easily remoulded by hand to a material with soil properties.
Low
VL Very 0.03 to 0.1 | Material crumbles under firm blows with sharp end of pick; can be peeled
Low with knife; too hard to cut a triaxial sample by hand. Pieces up to 30 mm
can be broken by finger pressure.
L Low 0.1 to 0.3. | Easily scored with a knife; indentations 1 mm to 3 mm show in the specimen ,
with firm blows of pick point; has dull sound under hammer. A piece of core
150 mm tong by 50 mm diameter may be broken by hand. Sharp edges of|
core may be friable and break during handling.
M Medium 0.3 to 1 Readily scored with a knife; a piece of core 150 mm long by 50 mm diameter
, ; can be broken by hand with difficulty.
H High - 1to3 A piece of core 150 mm long by’50 mm diametemcannot be broken by hand
but can be broken with pick witha single firm blow;rock rings under hammer.
VH Very 3 to 10 Hand specimen breaks with pick after more-than. one blow; rock rings under
High hammer.
EH Extremely* { © >10°. «| Specimen requires’ many blows with.geological pick to.break through intact!
High material; rock ringsunder hammer.
ROCK STRENGTH TEST RESULTS
v Point Load Strength Index, IScsoy Axial test (MPa)
4 Point Load Strength Index, ls¢sq), Diametral test (MPa)
ROCK MATERIAL WEATHERING
Symbol! Term Field Guide
Residual Soil developed, on extremely weathered rock; the mass structure and
RS es “substance fabric-are no longer evident; there is a large change in volume
Soil but the soil has not been significantly transported.
EW Extremely Rock is weathered to such an extent that it has soil properties - i.e. it either
Weathered disintegrates or can be remoulded, in water.
HW Rock strength usually changed by weathering. The rock may be highly
Distinctly discofoured, usually by iron staining. Porosity may be increased by leaching,
DW MW Weathered or may be decreased due to deposition of weathering products in pores.
sw Slightly -Rock is slightly discoloured but shows little or no change of strength relative
Weathered to fresh rock.
FR Fresh Rock shows no sign of decomposition or staining.
ABBREVIATIONS FOR DEFECT TYPES AND DESCRIPTIONS
Defect Type Coating or Infilling . Roughness
B Bedding parting Cn Clean Sl Slickensided
x Foliation Sn Stain sm Smooth
L Cleavage Vr Veneer Ro Rough
J Joint Ct Coating
SZ Sheared zone (Fault) Planarity Vertical Boreholes — The dip
cs Crushed seam (Fault) Pl Planar (inclination from horizontal) of the defect
DS Decomposed seam Un Undulating is given.
is Infilled seam St Stepped Inclined Borehofes — The inclination is
Ss Schistocity measured as the acute angle to the
Vv Vein core axis.

 

 

 

 

GAP Form No. 7
RLA