Shield segment assembly with material limiting function and shield segment back grouting method

The invention discloses a shield segment assembly with a material limiting function and a shield segment back grouting method.The shield segment assembly comprises a segment body, a geomembrane bag and a slurry pipe, a segment through hole is formed in the segment body, and a secondary grouting sleeve is installed in the segment through hole; the geomembrane bag is provided with a plurality of through holes for solution in grout to pass through, the through holes can prevent sand in the grout from passing through, the geomembrane bag is arranged on the outer side surface of the pipe piece body, a connecting through hole is formed in the position, corresponding to the secondary grouting sleeve, of a bag body of the geomembrane bag, and the first end of the grout pipe is connected with the connecting through hole. The second end of the slurry pipe is arranged in the secondary grouting sleeve and is connected with the secondary grouting sleeve; in the method, all the shield segments or the shield segments locate