1 Introduction
2 The Risk-Based Design Philosophy
2.1 Design as a Decision Under Uncertainty
2.2 Design is Part of the Project’s Risk Management
2.3 Observational Approaches are Fundamental to Underground Excavation in Rock
3 Challenges that Need to be Addressed in the Revision Work
3.1 Ensured Connection Between Design Work and Risk Management
3.2 Need for Stringent Hierarchy
Safety class | Minimum values for β | |
---|---|---|
Reference period 1 year | Reference period 50 years | |
RC3 | 5.2 | 4.3 |
RC2 | 4.7 | 3.8 |
RC1 | 4.2 | 3.3 |