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Completion of tunnels上海夜网il line within reach

Most of the tunnels along the Lhasa-Nyingchi section of the Sich

上海夜网品茶微信uan-Tibet Railway have been completed, railway authorities said over the weekend.

The Bukamu Tunnel, one of the longest tunnels on the railway linking Lha上海夜网

sa and Nyingchi in Southwest China’s Tibet autonomous region, was completed on Fr

iday. With its completion, 96 percent of the tunnels on the Lhasa-Nyingchi section of the railway are finished.上海夜网

The 9,240-meter Bukamu Tunnel is located in Manling county of the reg

ion’s eastern Nyingchi city. According to the China Railway 17th Bureau Group, and it is

also the 37th tunnel to be completed for this section, leaving 10 other tunnels to be finished by the end of the year.上海夜网品茶微信

“Once construction began in October 2015, it took more than 300 workers 1,234 days to complete the tunnel,” said Y

an Qingjing, an official of the Lhasa-Nyingchi Railway Headquarters, which is part of the group.上海夜网

“The oxygen level in the region is merely 50 percent that of the plain are

as, with the tunnel’s location at an average elevation of 3,000 meters above sea level, a上海夜网品茶微信

nd the oxygen level inside the tunnel is only 19 percent of that of the plain areas,” Yan said.

The group’s statistics show that more than 90 percent of the tunnel is rock burst section, and that more than 3,000 ro上海夜网

ck bursts were counted during construction of the tunnel, with an average daily burst of three.

Wang Shucheng, director of the project, said the tunnel’s depth reaches上海夜网

1,381 meters at one point, and high geostress inside causes the tunnel’s highest tem

perature to reach 42 C, much higher than the railway tunnel construction safety temperature of 28 C.上海夜网品茶微信

“The tunnel is like a steam room,” said Kang Yanjun, who works with the group. “On

ce you get inside, you begin sweating profusely. It is like doing anaerobic exercise.”上海夜网品茶微信

The technicians must exert a lot of energy every time the

y work in the tunnel, and each person needs at least 10 bottles of water, Kang said.

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