Variation of Rock Mass Pressure during Tunnel Construction in Phyllite Stratum

Table 6

Fitting parameter range of rock mass pressure and clearance convergence.

Function types	Basic form	Parameters	Value range
Logarithmic function			−52.749∼−10.081
			−5.891∼−1.205
			3654.005∼7747.978
Logistic function			0.003∼0.007
			0.094∼0.276
			177.585∼206.915
			15.085∼17.577
Multiple functions			0.002∼0.050
			−0.001∼0.001
			−0.00002∼0.00001
			−0.0002∼0.0002