Ground surface settlement-based displacement prediction method for underneath passing of existing shield tunnel by double-track tunnel

The invention discloses a ground surface settlement-based displacement prediction method for underneath passing of a double-track tunnel through an existing shield tunnel, and relates to the field of tunnel engineering. According to the ground surface settlement-based displacement prediction method for underneath passing of the existing shield tunnel by the double-track tunnel, inversion is carried out according to a monitoring result of ground surface settlement induced by construction of a newly-built double-track tunnel, and a correlation coefficient reflecting characteristics of a ground surface settlement curve induced by construction of the newly-built double-track tunnel is obtained; the coefficient obtained through inversion is used for predicting deep soil settlement at the position of the existing tunnel; the existing shield tunnel is regarded as a continuous beam model on a foundation, and a balance differential equation about the vertical displacement of the existing shield tunnel is obtained; and