21. What is the name of the failure surface where shear displacement occurs in rock?
22. What does the Hoek-Brown criterion estimate?
23. Which of the following is not a mechanical property of rock?
24. Which parameter describes the stiffness of rock?
25. What does �intact rock� refer to in rock mechanics?
26. Which method is commonly used to support tunnels in weak rock?
27. What factor is considered in rock slope stability but not in soil slope stability?
28. The term �overbreak� in tunneling refers to:
29. Which index measures the roughness of a joint surface?
30. Rock reinforcement using steel mesh is often combined with:
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