ABSTRACT
This paper describes a design of tunnel supporting system based on geostatistical tools. Typical Korean tunnel supporting system was composed of six types of combination of shotcrete, rockbolts, and concrete lining based on the rock mass rating (RMR). Ordinary kriging (OK), indicated kriging (IK), and sequential indicator simulation (SIS) were used to estimate RMR around the tunnel. For IK, we estimated the threedimensional distribution of RMR with the field data of borehole logging and geophysical data. And this result was compared with the results using OK and SIS. Using SIS, an equally probable simulation was performed 100 times to quantify the uncertainty of estimation. The accuracy of estimation was checked by split-sample validation.
