Obviously, planting grass and trees at the tunnel entrance needs to be measured in Chapter 500.

Need. According to the inquiry data, the tunnel entrance, as a common structure in highways and railways, is closely related to the natural environment. In addition to its function, it has symbolic and symbolic significance to the surrounding overall environment. The beauty of landscape should be an important part of entrance design. Obviously, it takes 500 chapters to plant grass and trees at the tunnel entrance. Chapter 500th mainly includes engineering contents, such as tunnel opening and open-cut tunnel engineering, tunnel excavation, tunnel lining, waterproof and drainage, fire retardant coating and decoration engineering in tunnel, wind and hydropower operation, ventilation and dust prevention, monitoring and measurement, special geological section construction, geological forecast, etc.