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

Table 3

Confidence intervals of geometrical parameters of structural plane in tunnel PD6.

Parameters of structural plane	95%	99%
	Scope of orientation	Scope of orientation
Joint 1	22.36∼28.86/21.33∼29.89	78.61∼81.37/78.17∼81.80
Joint 2	51.48∼58.80/56.32∼59.96	64.71∼68.78/64.07∼69.42
Bedding	59.48∼66.42/58.39∼67.52	19.32∼22.75/19.47∼23.19
Trace length	49.12∼58.17	47.70∼59.60
Spacing	16.87∼20.83	16.25∼21.45