Keyphrases
Tunneling
100%
Support System
100%
Nondestructive Evaluation
100%
Pipe Roof Support
100%
Grout Ratio
100%
Group Velocity
80%
Pipe Roof System
80%
Guided Waves
40%
External Diameter
40%
Acoustic Emission Sensor
20%
Steel pipe
20%
Non-destructive Method
20%
Reflection Method
20%
Tunnel Stability
20%
Hammer Impact
20%
New Austrian Tunneling Method
20%
Non-destructive Testing
20%
System Influences
20%
Fully Grouted
20%
Engineering
Tunnel Construction
100%
Support System
100%
Group Velocity
100%
Roof System
100%
Non Destructive Evaluation
100%
Main Frequency
100%
Guided Wave
50%
External Diameter
50%
Acoustic Emission
25%
Field Test
25%
Steel Pipe
25%
New Austrian Tunneling Method
25%
Destructive Method
25%
Non-Destructive Testing
25%