Application of the Risk Matrix Method for Geotechnical Risk Analysis and Prediction of the Advance Rate in Rock TBM Tunneling

Abbreviations AR Advance rate CO Carbon monoxide Con. Consequence CH4 Methane CM Clay mineral CSM Colorado School of Mines CZ Crushed zone DOR Description of risk F. zone Fault zone FZ Fractured zone GE Gas emission GW Groundwater inflow H High HCN Hydrogen cyanide Uns. zone Unstable zone ISRM International Society of Rock Mechanics JS Joint spacing K. zone Karstic zone L Low LEL Lower explosive limit Li. Likelihood LI Limestone LI-MA Marly limestone LI-SH Limey shale M Medium MA Marl Max. Maximum MC Muddy condition Min. Minimum OB Overburden Per. Permeability PSO Particle swarm optimization Q Q classification system QC Quartz content R Determination coefficient RDQ Rock quality designation RI Risk index RMSE Root mean square error SH Shale SH2 Hydrogen sulfide SQ Squeezing St. Dev. Standard deviation TBM Tunnel boring machine TRI Total risk index UCS Uniaxial compressive strength VH Very high WCZ Width of crushed zone WIC Water inflow condition WT Water table