Tuanshanzi Tunnel is the key project of the Northeast Ring Road of Shenyang Railway Hub. The total length of the tunnel is 330 1m, which is a double-track single-hole railway tunnel. The surrounding rock of tunnel is poor, and the deformation of surrounding rock and surface settlement are difficult to control during construction, which is easy to cause collapse and roof fall, and the safety risk is huge.

The entrance is 500 meters southwest of Wang Jiagou Station of Ring Road, and the exit is near Yijiagou Village, Ying Da Township, Dongling District. The maximum distance between the tunnel and the ground is 40m and the minimum distance is 7m.

Tuanshanzi Tunnel is the first railway tunnel in Shenyang and the longest tunnel built by Shenyang Railway Bureau. It is also the longest double-track tunnel in Northeast China.