Performance Investigation of Tunnel Lining with Cavities around Surrounding Rocks

Table 4

Calculated stresses of selected lining sections in group 3.

Surface	Case	Lining section
		25°	50°	75°	90°	100°	135°	160°
Outer surface	3-1	1.46	3.50	4.16	−0.08	—	—	—
	3-2	1.38	3.38	−1.35	1.31	6.47	3.54	0.34
	3-3	1.38	3.47	−2.40	8.78	−2.30	4.99	0.40
Inner surface	3-1	4.53	2.49	2.90	6.06	—	—	—
	3-2	4.40	2.26	8.19	4.45	−0.21	2.54	3.68
	3-3	4.51	2.27	9.77	−2.78	10.30	3.11	3.52