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| Tunnel name | Length (m) | Project characteristics and main risks |
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| Laohushan Tunnel | Left: 1740 m, right: 1888 m | The tunnel is located on the side of the contact zone of the Upper and Lower Ordovician, there are obvious intrusive rocks exposed, and the overall uniformity of the rock mass is poor. |
| Daling Tunnel | Left: 961.7 m, right: 965 m | Rocks are exposed in some sections of the tunnel site, joints and cracks are developed, and rolling stones are seen at the foot of the slope. |
| Xiaoling Tunnel | Left: 500 m, right: 500 m | There may be small dissolution fissures in local rock formations, with more developed groundwater and joint fissures. |
| Jiangshuiquan Tunnel | Left: 3101 m, right: 3085 m | The tunnel body passes through multiple fault fracture zones and is affected by groundwater. There are many karst caves in distribution and complex types. |
| Longding Tunnel | Left: 2183 m, right: 2182 m | There are two squeezed and dense joints developed in the tunnel site area, and the joints produced along the structure develop and form corrosion cracks, dissolved pores, and caves. |
| Ganggou Tunnel | Left: 1105 m, right: 1091 m | The karst is developed, the fillings in the cave are prone to collapse when the cave is excavated, and water in the cave will have a large short-term inrush in the rainy season. |
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