An Investigation of Effects and Safety of Pipelines due to Twin Tunneling

Table 6

Summary of the calculation parameters of the centrifuge model tests.

Test identity	Smax (mm)	i (m)	α	κpmax/	Ku (MPa)	Kd (MPa)	[EPIP/(Ku^0.9Kd^0.1 ((n/2α)^0.5i)^4)] [Smax/(n/2α)^0.5i]^0.25	Spmax/
TunPipe1 (0.5%)	5.5	7.75	0.587	0.304	17.76	149.82	0.05560	0.78429
TunPipe1 (1.0%)	13.3	5.50	0.311	0.224	17.76	149.82	0.23228	0.57485
TunPipe1 (2.0%)	25.0	4.39	0.066	0.143	17.76	149.82	0.44059	0.48315
TunPipe1 (4.0%)	32.8	3.80	0.051	0.090	17.76	149.82	0.84092	0.34895
TunPipe2 (0.5%)	5.5	7.75	0.587	0.432	16.80	143.40	0.01729	0.88339
TunPipe2 (1.0%)	13.3	5.50	0.311	0.365	16.80	143.40	0.03552	0.82340
TunPipe2 (2.0%)	25.0	4.39	0.066	0.234	16.80	143.40	0.13702	0.62913
TunPipe2 (4.0%)	32.8	3.80	0.051	0.196	16.80	143.40	0.26152	0.52575
TunPipe3 (0.5%)	5.5	7.75	0.587	0.940	17.28	141.67	4.56631E − 4	0.99594
TunPipe3 (1.0%)	13.3	5.50	0.311	0.900	17.28	141.67	9.37974E − 4	0.98096
TunPipe3 (2.0%)	25.0	4.39	0.066	0.785	17.28	141.67	0.00362	0.96090
TunPipe3 (4.0%)	32.8	3.80	0.051	0.711	17.28	141.67	0.00691	0.95091

Note. TunPipe1 (0.5%) means that the pipeline in the centrifuge model test adopts the square aluminum pipeline provided in Table 5 and that the ground loss rate caused by tunneling is 0.5%. This interpretive mode also applies to other test identities.