Case study of slope protection net engineering
Jul 31,2025
This project is the Jinsha River Railway Bridge Tunnel Entrance Project, which is a large-scale public building facility and a key defense category. According to the investigation, there are multiple collapses on the mountain slope near the tunnel entrance, among which the collapse at the starting point of the entrance and exit line is soil collapse, and the collapse at the northeast corner of the quarry is rock collapse. Local rock collapses can be seen along the slope joints, indicating that the natural slope near the tunnel entrance is in an unstable state.
The high slope at the exit of the Jinshajiang Railway Bridge tunnel is located on the north side of the main section of the Nansha parking lot, north of the original quarry pit. Due to the excavation of the quarry, a steep slope of about 80 ° has been formed, and some parts are vertical slopes, forming a high and steep free face. The slope height is about 65-100m, in the shape of a steep ridge, without any support. The upper part of the slope is composed of residual granite soil and strongly weathered soil, with a loose structure and the characteristics of softening, disintegration, and rapid strength reduction when exposed to water. Under the action of heavy rainfall, it collapses along the moderately weathered and weak structural planes. The lower part of the slope is composed of mixed granite with slight weathering, and multiple sets of fractures are developed. In addition, due to mining and blasting, local closed fractures are opened, forming unloading fractures that form unfavorable combinations with the slope surface, affecting the stability of the slope. Therefore, reinforcement and protection are needed for the northern mountain slope.
Protection principle: Based on the layout plan of the site, taking into account the overall situation, and ensuring the safety of the engineering in the site, the design follows the protection principles of reducing mountain excavation and disturbance, reducing damage to natural vegetation, reducing construction difficulty, reducing post maintenance, and improving the utilization rate of open space in the site. A safe, applicable, technologically advanced, and economically reasonable design scheme is adopted.
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Anping County, Hengshui City, Hebei Province