Railways play an important role in China is transportation hubs, and the quality of railways directly determines transportation speed, track usage time, and human life safety. The laying of high-strength warp knitted geogrids in railway subgrade mainly has the following functions:

1. Railway subgrade reinforcement: Geogrid is used for railway subgrade reinforcement, integrated with pavement materials, which can effectively distribute loads, prevent slag loss and subgrade deformation, improve subgrade stability, and withstand larger variable loads.

2. Railway slag protection: Due to train vibration and wind and rain, slag is lost. Geosynthetic materials are used to wrap it to prevent slag loss and improve the stability of the roadbed.

3. Railway slope protection: Geosynthetic materials are used for slope protection on both sides of railways, which can prevent stones and fine soil from slipping, improve the service life of railways, and reduce maintenance.