Fenghuoshan Tunnel is located between Kunlun Mountain and Tanggula Mountain, with a total length of 1, 338m, and the entrance rail surface is 4905m above sea level. Fenghuoshan Tunnel was started in June 2000 1 018, and the main project was completed on July 29, 2003, and put into use on July12006.
Fenghuoshan Tunnel is located in the middle of Zhiduo County, Yushu Tibetan Autonomous Prefecture, Qinghai Province, and belongs to Hoh Xil National Nature Reserve in Qinghai Province. A single line is laid in the Fenghuoshan tunnel, with a maximum burial depth of 100 m and a minimum burial depth of 8m, with an entrance of 35m and an exit of 23m. It is the highest frozen soil tunnel in the world and the longest tunnel crossing the frozen soil area, and is known as "the highest tunnel in the world".
Climatic environment of fenghuoshan tunnel;
Wind volcano has a cold climate and humid habitat, and the foothills are surrounded by permafrost that does not melt all year round. Its main peak, Toto Dunsai, is an ice bucket glacier. Due to the glacial action, many stones here have formed grotesque stone forests and sea. Wind volcano has a unique geological structure and is inaccessible, which is a good primary zone for studying crustal movement and glacial permafrost.
The tunnel is located at the pass of the wind volcano, which is cold and anoxic, with low temperature and large temperature difference between day and night. At an altitude of 4,905 meters, the annual average temperature is MINUS 7℃, the lowest temperature in cold season is MINUS 465,438 0℃, and the oxygen content in the air is only about 50% of that in the mainland, so it is known as the "life forbidden zone". The tunnel body is all located in frozen soil and frozen rock, with complex geological strata, such as frozen soil, rich frozen soil, fractured ice and mudstone, and dense and mixed soil.
The above contents refer to Baidu Encyclopedia-Wind Volcano Tunnel.