Entrance of Nanliang Tunnel
Yinkun Expressway starts from Yinchuan City, Ningxia，Ends at Xiaojie Town, Kunming, Yunnan，The total length is 2322 kilometers，It is the national highway network planning.（2013-2030）The main traffic artery running through the core hinterland of China from north to south。Among，Nanliang Tunnel is located in Gancheng Town, Haiyuan County, Ningxia Hui Autonomous Region.，Adopt separate structural form，The right line of the tunnel is 2295 meters long.，The left line is 2325 meters long.，It is a long tunnel.。The maximum buried depth of the tunnel is about 105 meters.，There are 6 horizontal pedestrian holes.、3 transverse holes for vehicles and 3 emergency parking zones。Collapsible loess is widely distributed in the tunnel，Low strength，Poor stability，All areVGrade surrounding rock。There is a gully on the top of the tunnel.、Complex geological conditions such as sinkholes，The construction risk is high，It is one of the key and difficult control projects of the whole line.。
Since the construction started in August 2020，The project management team has continuously strengthened the identification and control of excavation risks.，Take special construction scheme as the core，Take the advanced geological prediction as a reference，Guided by monitoring measurement data，Carefully organized，Reasonable arrangement，Optimize the construction scheme for many times，Excavation and construction by three-bench seven-step method，Strict enforcement“Detect first、Tube advance、Short footage、Weak disturbance、Strong support、Early closure、Measure frequently”The principle of，Overcome the low strength of collapsible loess tunnel、Unfavorable geological conditions with poor self-stability，It took 22 months to complete the tunnel smoothly.。
Exit of Nanliang Tunnel
So far，Yinkun Expressway Project Completed a Total Investment of 15.7 Billion yuan。Among，Subgrade works completed 83%，Bridge and culvert works completed 76%，Tunnel works completed 90%。After the completion of the project，Shaanxi-Gansu-Ningxia provincial corridor will be opened，Effectively improve the travel conditions along the line.，To speed up the rural revitalization of the old revolutionary base areas in Shaanxi, Gansu and Ningxia、It is of great significance to promote sustained and healthy economic and social development.。
