Engineering Rock Mechanics

Q-system 197

054.0 J.

2

3

4

6

9

I2

IS

20

Table 12.2 Q-system parameters

Forhurxecth. we (3.0 n JJ ForpomL, WI

(2.0 x JJ

Q-~ystem Of Q=- ReDnLnL

Rock Mass Classification I 7 SRR

iiJ

gd

5 J1f: -.

.I

a:

b

e:

e:

:i

j:

Mmive. now m fmjoinu

Oncjointrcc

Onc joint set plus Mdom

Two joint ro

Two join1 acu plus mdom

ThRC joint sets

ThRCjoinI rctr plw Mdom

Pour or more joint reo. dom. heavily jointed 'mgu

cuk', eo.

cwhdmk.cadllike

0.75

1 .o

2.0

3.0

4.0

4.0

6.0

8.0

8.0-12.0 16'42'