Questions 4.7-4.70: in situ rock stress^41 144.10 The plan below shows a horizontal section through a rock mass.
Stress measurements were made from the gallery along the borehole
line Ox using the Japanese CCBO technique. The measured principal
stresses in the horizontal plane are plotted on the plan. What are the
main conclusions that you can draw from the stress variations?
20 MPa
Stress \I scale