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Domain for rock strength DESCRIPTION of RESULT entity
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References |
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AS 1726-1993 1993, Geotechnical site investigations. Standard
Australia |
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Qualifier 1: nominal minimum point load index, Mpa
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Qualifier 2: nominal maximum point load index, Mpa
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Note:
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Attribute |
Code |
Parent |
Category |
Synonyms |
Description |
Qualifier 1 |
Qualifier 2 |
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rock_strength |
EL |
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extremely low |
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point load index <=0.03 Mpa, material can be easily remoulded by
hand to a material with soil properties |
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0.03 |
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rock_strength |
VL |
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very low |
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point load index ranges 0.03 - 0.1 Mpa, material crumbles under firm
blows with sharp end of pick, can be peeled with a knife, pieces up
to 3cm thick can be broken by finger pressure |
0.03 |
0.1 |
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rock_strength |
L |
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low |
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point load index ranges 0.1 - 0.3 MPa, material easily scored with
a knife, indentations 1-3mm show with firm blows of pick point, has
a dull sound under hammer |
0.1 |
0.3 |
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rock_strength |
M |
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medium |
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point load index ranges 0.3 - 1 MPa, material readily scored with
a knife |
0.3 |
1 |
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rock_strength |
H |
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high |
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point load index ranges 1-3 MPa, rock rings with hammer |
1 |
3 |
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rock_strength |
VH |
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very high |
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point load index ranges 3-10 MPa, hand specimen breaks with pick after
more than one blow, rock rings under hammer |
3 |
10 |
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rock_strength |
EH |
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extremely high |
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point load index > 10 MPa, specimen requires many blows with pick
to break through intact material, rock rings under hammer |
10 |
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rock_strength |
UNK |
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unknown |
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rock strength is unknown |
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