Evaluation of the Total Quality of Tunnel Contour Using Projection Pursuit Dynamic Cluster Method

Table 11

Developed multiple indices system.

Target layer	Criterion layer	Index layer (unit)
The index system for contour quality rating A	Point indices B1	Maximum overbreak C11 (m)
		Average overbreak C12 (m)
		Maximum underbreak C13 (m)
	Linear indices B2	Maximum size of step between two guns C21 (cm)
	Surface indices B3	Area of overbreak C31 (m^2)
		Measured area C32 (m^2)
		Rate of overbreak C33 (%)
	Volumetric indices B4	Volume of overbreak C41 (m^3)
		Blast hole utilization factor C42 (%)