How long is the longest tunnel in Asia?

The longest highway tunnel in Asia-Qinling extra-long tunnel, with a total length of 18 km.

Qinling tunnel: I line18460m; Second Line18456m.

Qinling Tunnel was once the longest railway tunnel in China, located between Qingcha Station and Yingpan Station of An 'an-Kang Railway. It consists of two basically parallel single-line tunnels with a distance of 30 meters, of which the first-line tunnel 18460 meters; Total length of second-line tunnel18456m. The lithology of the tunnel passing area is mainly mixed gneiss, mixed granite and mixed granite containing green minerals. 13 faults have passed through the tunnel, among which the main faults are regional faults such as F, F and F. The elevation of the north entrance of the tunnel is about 870 meters, the elevation of the south entrance is about 1025 meters, and the height difference between the two ends of the tunnel is about 155 meters.

The location map of Qinling Tunnel taken by satellite shows that the longitudinal slopes of the tunnels on Line 1 and Line 2 are basically the same. After entering the tunnel from the bank of Xi, the interval is 1 1‰ uphill, and then the tunnel exit is 3.2km and 3‰ downhill. The maximum buried depth of the tunnel is about 1600 meters, and the length of the section with buried depth exceeding 1000 meters is about 3.8 kilometers. The geological conditions of Qinling tunnel crossing section are very complicated. After testing by various means, adverse geological disasters such as high ground stress, rock burst, floor mat, water gushing in fault zone and instability of surrounding rock appear in the construction, and the engineering construction task is very arduous.

Qinling Tunnel: At present, China Railway Highway has had seven experiences of crossing the Qinling Mountains.

The first time was when baoji-chengdu railway Panshan crossed the Qinling Mountains in 1950s.

The second time is to build the Qinling tunnel of Xikang Railway;

The third time is Xi 'an Nanjing Railway East Qinling Tunnel; The fourth time is the Zhongnanshan Tunnel in Qinling Mountains of Baomao Expressway (xikang high-speed).

The fifth time is the Qinling Tunnel Group of the Western Han Expressway (Beijing-Kunming Expressway).

The sixth time is the lanzhou-chongqing railway West Qinling Tunnel under construction.

The seventh time is the tunnel group in Qinling Mountain area of Xicheng high-speed railway under construction.