The apron operation area is the busiest area for loading and unloading operations in the container terminal. The overall stability of the site is one of the important factors to ensure the operation efficiency of the port. For automated container terminals，it is also the main factor to reduce the maintenance cost of intelligent equipment. However，in the container terminal with gravity structure，there are two common quality problems in the apron operation area，one is the phenomenon of ‘sag’ in the area between the two rails of the quay crane，and the other is the phenomenon of ‘protruding’ of the land side rail of the quay crane. In recent years，with the transformation of transportation construction from pursuing speed and scale to focusing on quality and efficiency，the application of surcharge preloading technology provides more verification data of the compact settlement of the rock mound，and can also better solve the series of quality problems，such as the disturbance of visual sensing of the automated horizontal transportation equipment caused by the accumulation of water，and the jumping of the horizontal transportation equipment on the land side rail of the quay crane.