Table 2 The situation of underground pipelines and power tunnel in the Southern and Northern segment sections.

1

RQ-20

PE pipe, DN160, Medium Pressure.

East-west

Bury depth: 0.9 m, Perpendicular clear distance to quasi-rectangular tunnel: 16.85 m

2

GS-25

Cast iron pipe, DN300.

East-west

Bury depth: 1.7 m, Perpendicular clear distance to quasi-rectangular tunnel: 16.03 m

3

RQ-27

PE pipe, DN160, Medium Pressure.

East-west

Bury depth: 1.0 m, Perpendicular clear distance to quasi-rectangular tunnel: 17.08 m

4

GS-21

Cast iron pipe, DN300.

East-west

Bury depth: 2.3 m, Perpendicular clear distance to quasi-rectangular tunnel: 15.76 m

5

YS-15

Concrete pipe, DN500.

East-west

Bury depth: 1.7 m, Perpendicular clear distance to quasi-rectangular tunnel: 15.8 m

6

DL-18

Width: 3.2 m, Height: 3.9 m, Inner Clear Height: 2.9 m, Inner Clear Width: 2.2 m, Mining method, Initial Support: 0.2 m, Secondary Lining: 0.3 m, Horseshoe-shaped section

East-west

Bury depth: 4.9 m, Perpendicular clear distance to quasi-rectangular tunnel: 9.68 m