Tunnel Support Design - Tunneling Short Course
Tunnel Support Design
Eric Wang, PE
University of Denver Tunneling Short Course
September 11, 2018
Agenda
1.0 Introduction 2.0 Tunnel Support Design Principles 3.0 Input for Design 4.0 Tunnel Support Systems 5.0 Hard Rock Tunnel Support Design Example 6.0 Soft Ground Tunnel Support Design 7.0 Summary
2
1.0 Introduction
Design Flowchart sample: (THE Tunnel project)
3
2.0 Tunnel Support Design Principles
Rock Support Interaction: ? Optimize support installation - acceptable displacement.
Ground vs Support Reaction Curves
Ground Reaction Curves based on Overburden Depth
4
3.0 Geologic Input for Rock Tunnel Design
? Rock Mass Classifications:
? Rock Mass Rating (RMR) System (Bieniawski, 1989) ? Modified RMR (Laubscher and Page, 1990) ? NGI's (Q) System (Barton et al., 1974, 2015)
? Rock Mass Discontinuity Orientation and Properties ? Rock Hardness, Strength and Abrasiveness for Excavation
5
Initial Ground Support
? Rock Bolts / Dowels
? Type ? Length ? Pattern ? Anchorage
? Shotcrete
? Thickness ? Type, Dry vs Wet
? Lattice Girders
6
Rock Mass Classification ? Q system
After NGI 2015
7
RMR Classification
8
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