Geotechnical and Materials Engineering Standards for Bridge ...
Geotechnical and Materials Engineering Standards for Bridge ...
Geotechnical and Materials Engineering Standards for Bridge ...
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Svacinm Classfdtiation<br />
Extremely close<br />
Very elose<br />
Close<br />
Mcderately close<br />
Wide<br />
Very vide<br />
Extremely wide<br />
S ~ s e Width b la1<br />
< 0.02<br />
0.02 - 0.06<br />
0.06 - 0.20<br />
0-2 - 0.6<br />
0.6 - 2.0<br />
2 - 6.0<br />
> 6.0<br />
ROCK QUALIn DESIGNATION - The Rock Qualf ey ~eslgnation~ (FtQD) is<br />
an indirect measure of the number of fractures <strong>and</strong> the amount of<br />
softening or alteration in a rock mass. It is obtained from the<br />
rock cores by summing up the length of core recovered, covntfng<br />
only those pfeces 05 sound core that are 1 0 b or more in<br />
I. '<br />
length. The RQD value is expressed as a percentage <strong>and</strong> is the<br />
ratio of the,summed core lengths to the total core length (core<br />
sun). The classiffcation according to the RQD-value is given<br />
below.<br />
ROD Classifi-atioq<br />
Very poor quality<br />
Poor q ulf ty<br />
Fair quality<br />
Good quality<br />
Excellent quality
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