When will Jinshan Tunnel be launched?

When Jinshan Tunnel is a controlled project of Dunhuang-Golmud Railway, its entrance is located on the north side of Dangjinshan Pass in the south of Aksai County, and its exit is located in the piedmont alluvial-diluvial plain on the south edge of Altun Mountain. The tunnel body is located at the junction of Qilian Mountain and Altun Mountain, with a high altitude, a design length of 20. 1km and a target speed of120km/h/h. It is a single-slope tunnel and the longest single-hole single-track tunnel in China. The tunnel was designed by China Railway No.1 Survey and Design Institute Group Co., Ltd. and constructed by China Railway No.17 Bureau Group Co., Ltd.

Brief introduction of tunnel

Dangjinshan Tunnel of Dunge Railway is located in Aksai County, Gansu Province, west of China, in a no-man's land west of Yangguan. This used to be a place where no birds lived. In the Tang Dynasty, Wang Wei once lamented that "people left Xiyangguan for no reason". Jinshan Tunnel passes through Altun Mountain and Qilian Mountain, with a total length of 20. 1km, an average elevation of 3000m and a design speed of120km/h. The construction scheme of "3 inclined shafts+entrance horizontal guide +2 ventilation shafts" is adopted. Dangjinshan Tunnel is the longest single-hole, single-line and one-sided slope tunnel in China, and it is also the first pilot project of extra-long tunnel with mechanized supporting construction in Railway Corporation.

architectural feature

When the geological conditions of Jinshan Tunnel are very complicated and the natural environment is very bad, it brings great difficulties to the tunnel construction. There are "three more" (many fault fracture zones, many bad geology [1] and many types of groundwater erosion), "three higher" (high altitude, high ground stress and high earthquake intensity) and "three longer" (long slope at one side and long ventilation distance at one end) according to the Party. The tunnel design team solved a series of problems by combining scientific research, including:

Mechanized construction of deep wells in alpine plateau: ventilation and drainage in the construction of extra-long tunnels with single track, single hole and single slope; rapid construction of small-section tunnels; prevention and treatment of freezing injury of ordinary-speed railway tunnels in alpine plateau; disaster prevention and rescue of extra-long tunnels with single track and single hole; Soft rock deformation and rockburst caused by extra-large active fault zone and high ground stress.

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