Four road tunnels of which the construction conditions were sim ilar were selected in the paper, and laboratory testsand rockmass classification for the tunnels were carried out. A nd the analysis was performed to find out the correlationpattern of tu...
Four road tunnels of which the construction conditions were sim ilar were selected in the paper, and laboratory testsand rockmass classification for the tunnels were carried out. A nd the analysis was performed to find out the correlationpattern of tunnel using jumbo drill machine. It wasanalyzed that there was average abrasion of bit from 11.85% to 3.25% per support patterns of tunnel in four tunnels.Drilling parameter happens to fluctuate according to extent of fracture zone.