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7.2–7.6 meters in diameter (45 m 2 cross section). Part of a wider complex of tunnels that are 72 kilometers in length combined. Water supply Quabbin Aqueduct: Massachusetts, United States 39,600 m (24.606 mi) 1933 Metro Chengdu Metro Line 4: Chengdu, China 39,300 m (24.420 mi) 2015–2017 Metro Chengdu Metro Line 7: Chengdu, China
A polytunnel (also known as a polyhouse, hoop greenhouse or hoophouse, grow tunnel or high tunnel) is a tunnel typically made from steel and covered in polyethylene, usually semi-circular, square or elongated in shape.
13.654 km (8.5 mi) 2012 [25] 2 S56 Shanxi Taiyuan-Gujiao Expressway Left tube：13.654 m, right tube：13.570 m New Erlangshan Tunnel [26] China 13.433 km (8.3 mi) 2018 2 Ya'an-Kangding Expressway Left tube: 13.433 m, right tube: 13.381 m Hongtiguan Tunnel: China 13.122 km (8.2 mi) 2013 [27] 2 S76 Shanxi Changzhi-Pingshun Expressway
Portland Tunnel, single 3-lane tunnel carrying eastbound traffic, Interstate 94 near downtown Minneapolis; METRO Blue Line airport tunnels, 1.4 mi (2.3 km) twin bore light rail tunnels, 70 ft (21 m) under Runways 12L/30R and 12R/30L at Minneapolis–Saint Paul International Airport; Terminal 1–Lindbergh station is midway through the tunnel ...
Tunnel Construction. Tunnels are dug in types of materials varying from soft clay to hard rock. The method of tunnel construction depends on such factors as the ground conditions, the ground water conditions, the length and diameter of the tunnel drive, the depth of the tunnel, the logistics of supporting the tunnel excavation, the final use and shape of the tunnel and appropriate risk management.
2.74 m × 2.44 m × 3.66 m (9 ft 0 in × 8 ft 0 in × 12 ft 0 in) Transonic United Kingdom Transonic closed circuit, continuous flow wind tunnel. Mach number 0 - 1.4. Reynolds Number 3.5 to 16.7 million/m [7] Auto Research Center [8] 2.3 m × 2.1 m (7 ft 7 in × 6 ft 11 in)
While the sub-sea tunnel deepest point is 165 meters (541 ft) below sea level, the deepest sea depth is 40 meters (130 ft), and the minimum rock coverage is 40 meters (130 ft). The tunnel is a single bore with 2 lanes, except on the northern end of the tunnel where there are 3 lanes: 2 lanes on the uphill section and 1 lane downhill.
The northern portal of the tunnel is located at 561 meters above sea level, while the southern portal is located at 510 meters. [2] [3] [4] The eastern tunnel is slightly longer than the western (5,679 metres (18,632 ft) vs 5,670 metres (18,600 ft)). The tunnel tubes are 25 metres (82 ft) apart, and are connected by 4 passages for vehicles and ...