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

Table 5

Interval estimation for each parameter in the Hongfeng tunnel.

Structural plane		Hongfeng tunnel
Confidence level	Geometrical parameter	Joint 1	Joint 2	Bedding
95%	Orientation (°)	149.87∼187.77/81.22∼83.15	54.12∼61.72/81.78∼83.75	60.0∼80.0/8.0∼15.0
	Spacing (cm)	39.96∼53.58	29.36∼62.18	/
	Trace length (cm)	53.20∼82.80	49.26∼98.74	/
99%	Orientation (°)	142.75∼159.01/76.71∼83.46	47.43∼62.92/77.43∼84.06	60.0∼80.0/8.0∼15.0
	Spacing (cm)	29.87∼56.20	26.79∼67.33	/
	Trace length (cm)	52.17∼87.45	53.33∼106.51	/