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

Table 16

Rating of tunnel contour quality.

Eigenvalue	Range	Rating
2.86	1.94–2.86	Very good (I)
1.94	1.28–1.94	Good (II)
1.28	0.67–1.28	Fair (III)
0.67	0–0.67	Poor (IV)
0.00	0	Very poor (V)