Step-by-step optimization method for shield tunneling parameters of slurry balance considering grouting lag

The invention discloses a grouting lag-considered slurry balance shield tunneling parameter step-by-step optimization method, and belongs to the technical field of shield control. The method comprises the steps that a database is built according to built project data, a DBSCAN clustering algorithm is adopted to achieve refined working condition category extraction, working condition matching is conducted on working condition data of a project under construction and a refined working condition database, and a shield tail grouting amount preset value is obtained; an integrated algorithm is adopted to construct and train a ground surface settlement prediction model, at the position of a cutterhead notch ring, a shield tail grouting amount preset value and shield tunneling machine tunneling parameters of the notch ring serve as model input, ground surface accumulated construction settlement at the position of the notch ring is predicted, and the notch ring tunneling parameters are optimized according to a settlem