The longest tunnel of china-laos railway has broken through 10,000 meters

On January 13, the 17.5-kilometer exit of the million (xiang) railway from China, Laos, kunming (Ming) to no.5 inclined shaft was successfully completed, and the tunnel tunneled 106,60 meters, breaking the 10,000-meter mark. This provides an important guarantee for accelerating the construction of the tunnel and lays a foundation for the tunneling.

Ding tunnel is located at the junction of yuanjiang county and mojiang county, yunnan province. It is a high risk tunnel of class I and passes through the towering ailao mountain range. It passes through 20 faults and 2 syncline structures. According to the introduction, the jingan tunnel is a combination of harmful gas, karst, soft rock, water gusher, high ground stress and high geothermal, and its project scale, construction difficulty and project risk are extremely rare in the field of railway tunnel construction in China.

In order to achieve the goal of transfixtion on schedule, ding 'an tunnel adopts the method of "long tunnel and short hit", and sets up 5 inclined shafts and 7 work areas in total for construction.

According to the introduction, this tunnel is mainly carbonaceous mudstone, carbonaceous shale, local inclusion of sand and gravel, one of the most complex section of the carbonaceous structure, rock mass is extremely broken, like digging tunnels in sandbags, only by grouting reinforcement to ensure the stability of the tunnel. This exit to no. 5 inclined shaft through, can improve the construction environment, open more positive hole construction face, speed up the tunnel construction speed.

At present, there are more than 6,800 meters left in the main tunnel, and the construction of 21 working faces is accelerating. It is expected to be completed in 2020. The railway connects China at one end and Laos at the other. It is an important infrastructure link between China and Laos. After completion and opening to traffic, the time between kunming in yunnan and jinghong in xishuangbanna and vientiane in Laos will be greatly reduced.