The construction of a tunnel on the Kunming-Vientiane Railway to link southwest China's Yunnan province with Laos was completed on Sunday.
The construction of the Jingkuan No.2 Tunnel on the Kunming-Vientiane Railway to link southwest China's Yunnan province with Laos is completed on April 19, 2020. [Photo/Xinhua]
The Jingkuan No.2 Tunnel, about 4.6 km long, is located in Jinghong city of Yunnan.
The tunnel with a super-large exit has a 80-meter stretch with fault surface of 249 square meters. The design is to reserve connection conditions for the future expansion with a new railway line.
"Due to the large span of the section, the technical team has innovated a new patented technology to effectively avoid the risk of tunnel collapse," said Wang Guanying, a project manager of China Railway 22nd Bureau Group Co. Ltd.
The tunnel is on the 508 km Yuxi-Mohan section of the Kunming-Wanzhou Railway, which is scheduled to be opened simultaneously with the Boten-Vientiane section in Laos to be completed by the end of 2021.
The cross-border railway is a major project built under the Belt and Road Initiative. The 1,000 km railway will slash the travel time between Kunming and Vientiane to half a day.
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