Variation of Rock Mass Pressure during Tunnel Construction in Phyllite Stratum

Table 5

Fitting correlation coefficient between rock mass pressure and clearance convergence.

Function types	Results	Y3	Y4	Y5	Y6
Logarithmic function	Correlation coefficient R^2	0.259	0.534	0.071	0.713
Logistic function	Correlation coefficient R^2	0.948	0.975	0.103	0.968
Multiple functions	Correlation coefficient R^2	0.848	0.832	0.375	0.968