Jundushan tunnel

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Jundushan Tunnel
军 都 山 隧道
use Railway tunnel
traffic connection Datong – Qinhuangdao Railway
place Yanqing , Beijing , China
length 8460 m
Number of tubes 1
Largest coverage 670 m
construction
start of building 1985
completion 1989
business
operator Daqin Railway
location
Jundushan Tunnel (China)
Red pog.svg
Red pog.svg
Coordinates
West portal of Jundushan Tunnel 40 ° 25 ′ 3 ″  N , 116 ° 4 ′ 20 ″  E
East portal of Jundushan Tunnel 40 ° 24 ′ 0 ″  N , 116 ° 10 ′ 9 ″  E

The Jundushan Tunnel ( Chinese  军 都 山 隧道 , Pinyin Jūndōushān suìdào ) is the longest railway tunnel on the Chinese heavy-duty coal line Datong – Qinhuangdao . It was opened in 1989 and is located on the Yanqing North – Tielucun section about 50 km northwest of Beijing . When it opened, the tunnel was the third longest rail tunnel in China after the Mihualing Tunnel .

construction

The construction of the tunnel turned out to be difficult because it leads through different types of rock. Starting from the west portal, the first 670 m of the tunnel run in the loess and have only a slight overburden of 12 to 23 m, at one point only 3.6 m. This is followed by igneous rock , in which the longest section of the tunnel lies. Towards the east portal is a section about 500 m long in weathered granite and the last 70 m before the portal leads through alluvial gravel.

In total, 920,000 m³ of rock had to be excavated, 200,000 m³ of concrete was used for the lining. The construction was carried out from the two portals as well as from three sloping intermediate access shafts. The groundwater is discharged with a 2 km long gallery running parallel to the tunnel from the east portal. Around 13,200 m³ of groundwater are produced every day.

The excavation in the loess section was carried out with pipe umbrellas , the remaining sections were excavated by blasting using the new Austrian tunneling method (NATM). Construction began in 1985 and was carried out by the China Railway Tunnel Group.

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