Rock-Properties Estimation by TBM Cutting Force

1. Introduction

2. Review of Excavation Tests

3. Niken-Goya Tunnel

4. Maiko Tunnel

5. Culter-Goodman Tunnel

6. Conclusion




A method for estimating rock strength using TBM cutting force is proposed based on experimental findings. The calculated rock strength coincides well with those obtained using other methods, such as bedrock survey, Schmidt-hammer rebound hardness, etc. The proposed method is relatively simple and requires the determination of only three values: thrust, torque and cutting depth. The proposed method appears to be promising for real-time in-situ estimation of rock strength.