Table 3: Length, pressure and method of high pressure grouting Hole depth (m) 0.0 ~ 2.0 2.0 ~ 6.5 (8.0) Length to grout (m) 2.0 4.5 (6.0) Grout pressure (MPa) 2.0 ~ 4.0 5.0 ~ 6.0 Grouting method Pure pressure Cycle inside the hole