Retaining walls (the retaining wall) is a stand base filling slope or Hill-wall structures. It is a retaining wall of the lateral pressure on the body. It has stopped falling behind the wall, protecting the roadbed and systolic foot function. In roadbed engineering in the retaining wall used to overcome the limitations of terrain or terrain and interference, reducing the number of earthwork, demolition, and covers to prevent extrusion swept Tao River and the shore of the fill, treatment of slope slide disease. Scope of application of retaining wall: