Shield tunnel side penetrating pile foundation deformation control method under viaduct operation condition

The invention relates to the technical field of shield tunnels, in particular to a deformation control method for a shield tunnel side-penetrating pile foundation under the viaduct operation condition, which comprises the steps that a shield tunnel laterally penetrates through a viaduct, the viaduct comprises an existing pile foundation and an existing bearing platform, and the top of the existing pile foundation is connected with the existing bearing platform; mJS construction method piles are adopted, the two sides and the top of the shield tunnel are reinforced, and a gate type reinforcing area is formed; newly-built pile foundations are additionally arranged beside the existing pile foundations of the viaduct, and the vertical bearing capacity of the pile foundations is enhanced; the foundation pit is excavated to the bottom of the existing bearing platform, the newly-built bearing platform is arranged in the foundation pit, and the newly-built pile foundation and the existing pile foundation are connecte