Research on Surface Subsidence of Long-Span Underground Tunnel

Table 10

Statistics of surface settlement data.

Scope	0～10 mm	−10～0 mm	−20～−10 mm	−30～−20 mm
Number	2	68	1	1
Frequency	0.03	0.94	0.01	0.01
Cumulative frequency	0.03	0.97	0.99	1.00