Settlement Prediction Method of Extra-Large Diameter Tunnels in Soft Rock Strata

Table 3

Settlement of tunnel vaults with different excavation spans (unit: cm).

Excavation distance between measuring point and tunnel face	Tunnel excavation span
	18 m	22 m	26 m	30 m
2.4	0.5318	0.5711	0.6118	0.5273
4.8	0.9640	1.0064	1.1367	0.8854
7.2	1.3572	1.5041	1.6257	1.5173
9.6	1.5909	1.7922	1.9653	1.9969
12.0	1.7548	2.0057	2.2310	2.3498
14.4	1.8765	2.1743	2.4497	2.6398
16.8	1.9718	2.3123	2.6345	2.8854
19.2	2.0486	2.4284	2.7946	3.1006
21.6	2.1126	2.5274	2.9347	3.2904
24.0	2.1668	2.6144	3.0599	3.4622
26.4	2.2139	2.6907	3.1727	3.6172
28.8	2.2555	2.7594	3.2759	3.7603
31.2	2.2931	2.8216	3.3723	3.8930
33.6	2.3274	2.8798	3.4619	4.0198
36.0	2.3596	2.9347	3.5492	4.1427
38.4	2.3906	2.9889	3.6357	4.2671
40.8	2.4224	3.0458	3.7312	4.4078
43.2	2.4617	3.1180	3.8527	4.5884
45.6	2.4878	3.1647	3.9280	4.6916
48.0	2.5158	3.2112	3.9986	4.7976