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GEO5

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Mohr - Coulomb Parameters

If possible the strength parameters should be determined in-situ measurements. The results of in-situ and laboratory experiments show that the angle of internal friction is found for the majority of discontinuities in the rock mass in the range of 27° to 47°. Approximate values of the angle of internal friction φ and cohesion c for rocks based on the RMR classification are stored in the following table:

Rock class

I

II

III

IV

V

RMR

100 - 81

80 - 61

60 - 41

40 - 21

< 20

Angle of internal friction φ [°]

> 45

35 - 45

25 - 45

15 - 25

< 15

Cohesion c [kPa]

> 400

300- 400

200 - 300

100 - 200

< 100

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