English：

A doublerow pipe pile foundation excavation supporting structure in the Pearl River Delta was found to have cracks along the edge of the foundation excavation during its excavation. To further study the bearing characteristics, cracking causes, and crack control measures of the interaction between the doublerow pipe pile and the cover plate after the excavation of the foundation excavation, the scale model test was used to study the project. According to the different load conditions and the proposed improvement measures, the stress distribution and variation law of the connection between the pipe pile and the cover plate were analyzed, and the cause of the cover plate cracking was discussed. The results indicate that the strength of the connection between the top of the pipe pile and the cover plate is weak, and the peak stress appears on the front surface and the upper surface of the connection between the pipe pile and the cover plate, respectively. The direct reason for the cracking of the cover plate is that the pipe pile structure has a large deformation, and the deformation transmitted by the joint connection forces the cover plate to crack. The stress can be effectively reduced and the cracks can be controlled by adjusting the depth of the top anchor of the pipe pile into the cover plate and using the arrangement of the hidden beam reinforcement.