Shield cutter head escape method in large boulder stratum environment

The invention discloses a shield cutterhead escape method in a large boulder stratum environment, and aims to solve the technical problem that a conventional cutterhead escape method in a water-rich large-particle-size boulder stratum cannot enable a shield cutterhead to escape. The construction method mainly comprises the following steps of shaft dewatering construction, construction of fender posts and inner supports, earth excavation, net spraying between the fender posts, trial rotation of a cutterhead, brick wall building and backfilling, construction of a cover plate and shield re-pushing. Large-particle-size boulders and pebbles are taken out in the mode that the vertical shaft is excavated in front of the trapped cutter head, the problem that the cutter head is clamped can be thoroughly solved, the trapping-out effect is remarkable, and the shield equipment protection effect is good. 本申请公开了一种大漂石地层环境下盾构刀盘脱困方法，旨在解决在富水大粒径漂石地层中刀盘常规脱困方法无法使盾构刀盘脱困的技术问题。其主要包括以下步骤：竖井降水施工，围护桩及内支撑施作，土方开挖，围护桩间网喷，试转刀盘，砖墙砌筑及回填，盖板施作