Fig. 15

Proportional changes in the plastic zone (a) The ratio of the overall plastic zone volume of the blocking wall located at the center of the tunnel; (b) Fitting curve of the plastic zone volume at the blast-back surface of the blocking wall.

Proportional changes in the plastic zone (a) The ratio of the overall plastic zone volume of the blocking wall located at the center of the tunnel; (b) Fitting curve of the plastic zone volume at the blast-back surface of the blocking wall.