Q-Support-Chart

ROCK CLASSES G
Exceptionally poor

F
Extremely poor

E
Very poor
d are a
1.7 m

D
Poor

C
Fair
2.3 m 2.1 m

B
Good Very good

A
Ext. good Exc. good 20

100
ot in sh crete

2.5 m

Bolt length in m for ESR = 1

50
Bolt

spac

ing

1.5 m

11 7 5

1.3 m

1.2 m

Span or height in m ESR

1.0 m

20
9
CCA

8
RRS

7
Sfr

6
Sfr

5
Sfr

4B(+S)
B

3

2
sb

1
4.0 m

10
cm

3

4c

5

25

15

12

5

cm

cm

9

cm

cm

m

3.0 m

2.0 m 1.6 m

2
1.0 m

1.3 m

B

s olt

pa

cin

n gi

un

sh

re otc

a ted

rea

s

2.4

1.5

1 0.001

0.004

0.01

0.04

0.1

0.4

1

4

10

40

100

400

1000

Rock mass quality Q =
REINFORCEMENT CATEGORIES:1) 2) 3) 4) Unsupported Spot bolting, sb Systematic bolting, B Systematic bolting, (and unreinforced shotcrete, 4 - 10 cm), B(+S) 5) 6) 7) 8)

RQD Jr x Jn Ja

x

Jw SRF

Fibre reinforced shotcrete and bolting, 5 - 9 cm, Sfr + B Fibre reinforced shotcrete and bolting, 9- 12 cm, Sfr + B Fibre reinforced shotcrete and bolting, 12 - 15 cm, Sfr + B Fibre reinforced shotcrete, > 15 cm,reinforced ribs of shotcrete and bolting, Sfr, RRS+B 9) Cast concrete lining, CCA

ROCK CLASSES G
Exceptionally poor

F
Extremely poor

E
Very poor
d are a
1.7 m

D
Poor

C
Fair
2.3 m 2.1 m

B
Good Very good

A
Ext. good Exc. good 20

100
ot in sh crete

2.5 m

Bolt length in m for ESR = 1

50
Bolt

spac

ing

1.5 m

11 7 5

1.3 m

1.2 m

Span or height in mESR

1.0 m

20
9

8

7

6

5

4

3

2
4.0 m

1

10
cm

3

4c

5

25

15

12

5

cm

cm

9

cm

cm

m

3.0 m

2.0 m 1.6 m

2
1.0 m

1.3 m

B

s olt

pa

cin

n gi

un

sh

re otc

a ted

rea

s

2.4

1.5

1 0.001

0.004

0.01

0.04

0.1

0.4

1

4

10

40

100

400

1000

Rock massquality Q =

RQD Jr x Jn Ja

x

Jw SRF

REINFORCEMENT CATEGORIES:
1) 2) 3) 4) 5) Unsupported Spot bolting Systematic bolting Systematic bolting, (and unreinforced shotcrete, 4 - 10 cm) Fibre reinforced shotcrete and bolting, 5 - 9 cm 6) Fibre reinforced shotcrete and bolting, 9- 12 cm 7) Fibre reinforced shotcrete and bolting, 12 - 15 cm 8) Fibre reinforced shotcrete, > 15 cm, reinforcedribs of shotcrete and bolting 9) Cast concrete lining

ROCK CLASSES G
Exceptionally poor

F
Extremely poor

E
Very poor
rea ted a

D
Poor

C
Fair
2.3 m 2.1 m

B
Good Very good

A
Ext. good Exc. good

100
otcre
1.7 m

2.5 m

50
Bo

cing lt spa
1.2 m

in sh

1.5 m

1.3 m

Span or height in m ESR

20 D70/10 c/c 1.0
D55/6 c/c 1.2

1.0 m D70/8 D55/8 c/c 1.7c/c 2.3

D55/6 D40/4 c/c 3.2 c/c 3.2

D30/3 c/c 4.0

9

8
D40/4 D30/3 c/c 2.9 c/c 3.2 cm 15 D25/3 c/c 2.9

7

6

5

4

3

2
4.0 m

1

10

D45/6 D45/5 c/c 1.7 c/c 2.3

4c

5

D40/4 c/c 1.2

D35/5 D35/5 c/c 1.7 c/c 2.3

5

25

cm

12

cm

cm

9

cm

m

3.0 m

2.0 m 1.6 m

2
1.0 m

1.3 m

Bo

lt s

c pa

ing

in

u

h nsotc

re

a ted

rea

s

1 0.001

0.004

0.01

0.04

0.1

0.4

1

4

10

40

100

400

1000

Rock mass quality Q =

RQD Jr x Jn Ja

x

Jw SRF

REINFORCEMENT CATEGORIES:
1) 2) 3) 4) 5) Unsupported Spot bolting Systematic bolting Systematic bolting, (and unreinforced shotcrete, 4 - 10 cm) Fibre reinforced shotcrete and bolting, 5 - 9 cm 6) Fibrereinforced shotcrete and bolting, 9- 12 cm 7) Fibre reinforced shotcrete and bolting, 12 - 15 cm 8) Fibre reinforced shotcrete, > 15 cm, reinforced ribs of shotcrete and bolting 9) Cast concrete lining

D55/6 c/c 1.2

Reinforced shotcrete ribs: 6 reinforcement bars in double layers in 55cm thick ribs with centre to centre (c/c) spacing1.2m. Each box corresponds to Q-values of the left side of the...