Engineering Rock Mechanics

Questions 8.1-8.10: rock masses 429

B

dimensional proportional extent of fracturing' of
0.5.
Plot the expected peak strength of this rock mass
-b
as a function of the orientation of the principal
stresses to the fracture directions, for a minor prin- 0,
cipal stress of 5 MPa and given the following peak

A

e

03

strength characteristics: A
Intact rock: = 75 + 5.29~3 to,
Fracture set A: c = 100 kPa, 4 = 20",
Fracture set B: c = 0, 4 = 35"