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ParameterPoint-

load

strength

index

Uniaxial >250 Mpa 100-250 50-100

comp. Mpa Mpa

strength 22

15 12 7

2 90%-100% 75%-90% 50%-75%

20 17 13

3 >2m 0,6-2m 200-600

mm

15 10

Very rough Slightly Slightly

surfaces rough rough

surfaces surfaces

Not Separation Separationcontinuous

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rock

I II III

20 yrs for 15 1 yaer for 1 week for

m span 10 m span 5 m span

>400 300-400 200-300

>45 33-45 25-35

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25-50MPa 5-25 1-5 5 mm

Continuous

Flowing

0

Unfavourable

-25

-12

Very poor rock

V

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IV

10 hrs for 2.5

m span

100-200

15-25

10-20 m

1

1-5 mm

1

Smooth

1

Soft filling 5 mm

0

Decomposed

0

axis

Strike parallel to tunnel

Dip 0-20 - irrespective of strike

45-90o

ery

urable

Dip 20-45o

Fair