Numerical and Preliminary In Situ Investigation on Roadway Excavation Using Static Expansion Mechanical Fracturing

Table 3

Fracturing performance of hole network.

Pattern	Roadway section forming	Max. splitting force range (MN)	Overbreak and underbreak
P1 (column spacing = 1.0 m)	Yes	15–25	Overbreak 0.1–0.5 m,; underbreak 0.1–0.3 m
P2 (column spacing = 1.5 m)	Yes	15–28