Dynamic Analysis of Deep Water Highway Tunnel under Ocean Current

Table 3

The first ten natural frequencies at different water depths (Hz).

Order	Depth of tunnel pipe roof (m)
	20	30	40	50	60	80	100	150
1	0.66584	0.66516	0.66263	0.66075	0.65984	0.65692	0.65356	0.64704
2	0.71406	0.71504	0.71321	0.71278	0.7125	0.71134	0.7095	0.70527
3	0.82964	0.82936	0.82833	0.82744	0.82767	0.82601	0.82398	0.81834
4	1.2091	1.2089	1.2077	1.207	1.2069	1.2054	1.2027	1.1956
5	1.7021	1.7013	1.70	1.6979	1.6962	1.693	1.6875	1.6758
6	2.21	2.2095	2.2073	2.2069	2.2073	2.2054	2.2039	2.1988
7	2.1458	2.143	2.1411	2.1387	2.1371	2.1351	2.1326	2.1294
8	2.6414	2.6401	2.6384	2.6369	2.6359	2.6326	2.6265	2.6115
9	2.8153	2.8184	2.8134	2.8116	2.8108	2.807	2.8015	2.7884
10	3.4578	3.4567	3.4526	3.4513	3.4525	3.4493	3.4456	3.4279