Predictions of Overbreak Blocks in Tunnels Based on the Wavelet Neural Network Method and the Geological Statistics Theory

Table 2

Models of all parameters in tunnel PD6.

Parameters of structural plane	Samples	Average	Variance	Models	Parameters of model
					𝑎	𝑏
Orientation
Joint 1	87	25.61/78.99	15.46/65.66	Normal model; 𝑓(𝑥)=1√𝑒2𝜋𝑏^−(𝑥−𝑎)2/2𝑏2	25.61/78.99	15.46/65.66
Joint 2	86	55.14/67.74	17.34/9.62		55.14/67.74	17.34/9.62
Bedding	45	62.96/21.33	11.87/4.84		62.96/21.33	11.87/4.84
Trace length	129	53.65	26.44	Weibull model; 𝑓(𝑥)=1−𝑒^−𝑏𝑥𝑎	1.1034	0.0225
Spacing	123	18.85	11.18		1.689	0.0006