Variation of Rock Mass Pressure during Tunnel Construction in Phyllite Stratum

Table 10

Range of fitting parameters of rock mass pressure and distance from the tunnel face.

Function types	Basic form	Parameters	Value range
Logarithmic function			−31.034∼0.019
			−4.255∼−0.001
			1465.809∼4976.583
Logistic function			0.024∼0.049
			0.090∼0.233
			38.081∼58.231
			2.600∼5.339
Multiple functions			−0.006∼0.086
			−0.005∼0.004
			−0.0001∼0.0002
			−0.0003∼0.0003