Analysis on Loose Circle of Surrounding Rock of Large Deformation Soft-Rock Tunnel

Table 6

The calculation values of loose circles of grade II and III large deformation section (m).

Cross section mileage	Area	Thickness of loose circle at different bearing capacity ratios of the support structure
		0	10%	20%	30%	40%	50%	60%	70%	80%	90%	100%
DK234 + 205	Vault	24.08	18.02	14.64	12.39	10.75	9.47	8.45	7.61	6.89	6.27	5.73
	Side wall	26.59	19.19	15.35	12.88	11.11	9.76	8.68	7.80	7.05	6.41	5.85
DK234 + 318	Vault	24.66	18.52	15.15	12.92	11.30	10.04	9.03	8.20	7.49	6.88	6.34
	Side wall	27.06	20.00	15.81	13.37	11.63	10.31	9.25	8.38	7.64	7.01	6.45