Abstract: AbstractUrban rail transit shield tunnel structure deformation exceeding limit can possibly cause tunnel structure instability and even destruction, loss of functionality. Therefore necessary reinforcement or correction measures for treating shield tunnel structure deformation exceeding limit should be adopted. Taking shield tunnel of Suzhou rail transit operating lines as an example, the lateral rectification technology of shield tunnel grouting behind segment wall is introduced. With the 3D laser scanning monitoring data, the reinforcement effect of shield tunnel grouting behind segment wall is analyzed. Analysis shows that grouting behind segment wall can effectively improve shield tunnel structure strength, the shield tunnel structure convergence deformation exceeding limit can be rectified, and the range can be controlled within 0-20 mm. At the same time, existing problems of track bed can be treated through track fine adjustment, and structure problem caused by shield tunnel deformation exceeding limit can be effectively controlled.