MCU14/0106 Appendix E - Engineering Report

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TERMS FOR ROCK MATERIAL STRENGTH & WEATHERING
AND ABBREVIATIONS FOR DEFECT DESCRIPTIONS
STRENGTH
Symbol Term Point Load Field Guide
Index -Isso
(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
Low peeled 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 long 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 diameter can not be broken by
hand but can be broken with pick with a single firm blow; rock rings
under hammer.

VH Very 3 to 10 Hand specimen breaks with pick after more than one blow; rock rings
High under hammer. ,
EH Extremely >10 Specimen requires many blows with geological pick to break through
High intact material; rock rings under hammer.
ROCK MATERIAL WEATHERING
Symbol Term Field Guide
RS Residual Soil developed on extremely weathered rock; the mass structure
Soil and substance fabric are no longer evident; there is a large change
in volume 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
Weathered either disintegrates or can be remoulded, in water.
HW Distinctly Rock strength usually changed by weathering. The rock may be
pw Weathered highly discoloured, usually by iron staining. Porosity may be
MW increased by leaching, 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
Weathered relative 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 SI Slickensided
xX 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
DS Decomposed seam Un Undulating defect is given.
Is Infilled seam St Stepped Inclined Boreholes - The
Ss Schistocity inclination is measured as the
Vv Vein acute angle to the core axis.

 

 

 

 

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