Recently, Jiayuguan tunnel is under construction. It is understood that Jiayuguan tunnel is located in Yuquan Town, crossing Heishan, with a total length of 3044m and a maximum buried depth of 246m. It is a very long rock tunnel. According to the design of one-way double tunnel separation, the design speed is 100km / h. The overall geological conditions of the tunnel are good. The construction is divided into four sections, with a total construction period of 36 months. The picture shows the construction site.