针对成都砂、卵石地层盾构施工中刀盘、刀具和螺旋输送机等磨损大的问题，提出和实施了预防磨损和提高耐磨性的几方面措施，提出和应用了适用于成都砂、卵石地层的刀具，并特别强调了滚刀在成都砂卵石地层中使用的重要性和适用性。延长了刀盘、刀具和螺旋输送机的使用寿命，降低了磨损和消耗，减少了在砂卵石地层中的修理和更换刀具次数，顺利达到长距离掘进和施工的目标。

The wearing of the cutter heads, cutting tools and screw conveyors is serious when shield machines are used in the sandy gravel stratum in Chengdu. Wearing prevention countermeasures and antiwearing capacity improvement countermeasures are proposed, cutting tools suitable for the sandy gravel stratum in Chengdu are proposed and the importance and adaptability of disc cutters to the sandy gravel stratum in Chengdu are emphasized. In the end, the service life of the cutter heads, cutting tools and screw conveyors are extended, the wearing and relevant cost are reduced, the repairing and replacement of the cutting tools in the sandy gravel stratum are minimized and successful longdistance tunneling is achieved.