为有效控制海底隧道盾构刀具更换风险，提高盾构施工效率，针对厦门轨道交通3号线跨海段复杂地层，通过开展不同类型岩石的缩尺滚刀磨损试验和岩石磨蚀性试验，揭示滚刀材料磨损速率与岩石磨蚀性指标CAI值呈幂指数关系，建立通过测定拟建工程岩样CAI值预测工程刀具消耗的方法。利用建立的预测方法，对厦门轨道交通3号线中微风化花岗岩地层的滚刀批量换刀距离进行预测，得到该地层下边滚刀的批量换刀距离为50 m，正滚刀的批量换刀距离为215 m； 并在此基础上给出滚刀更换位置与换刀工法建议，为该工程与类似工程施工提供参考。

In order to effectively control the cutter replacement risk and improve the efficiency of seacrossing shield tunneling, the scalereduced disc cutter wear experiment and rock abrasion experiment of different rocks are carried out, by taking complex strata of seacrossing section on Xiamen Rail Transit Line No. 3 for example. And then the power exponential relationship between the wear rate of cutter material and CAI value of rock abrasion is revealed; and the method for predicting the consumption of cutter by measuring the CAI of rock samples of the proposed project is established. Finally, the method mentioned above is applied to the prediction of disc cutter replacement distances of shield in intermediatelyslightly weathered granite of Xiamen Rail Transit Line No. 3, and the prediction results are 50 m for edge disc cutter and 215 m for front disc cutter; base on which the advices for disc cutter replacement positions and methods are provide. The results can provide reference for similar projects in the future.