由于掘进环境过于恶劣，TBM（tunnel boring machine）滚刀受力实时监测问题一直难以解决。文章根据对滚刀部件特征和荷载传递规律的分析，在C型垫块中嵌入应变计，提出有效的监测方法，并通过C型垫块的标定试验以及回转破岩试验，验证该监测方法的有效性和可行性。结果表明： 1）在不同贯入度下，根据受力监测方法得到的垂向荷载与油缸荷载大小稍有差别，但两者的变化趋势几乎是一致的，说明该监测方法具有可行性和有效性； 2）随着贯入度的增大，滚刀所受法向力和侧向力也在增大。

Due to the harsh tunnelling environment, it is difficult to carry out realtime force monitoring of tunnel boring machine (TBM) disc cutter. Hence, the characteristics of disc cutter components and the transferring law of load are analyzed, a strain gauge is embedded in cshaped cushion block, an effective monitoring method is proposed, and effectiveness and feasibility of the monitoring method are proved by the calibration test of the cshaped support block and the rotary rockbreaking test. The test results show that: (1) Under the condition of different penetration degrees, the vertical load obtained by the stress monitoring method is slightly different from that of the oil cylinder, and the variation trends of the stresses are almost the same, which indicates the feasibility and effectiveness of the monitoring method. (2) With the increase of penetration degree, the normal and lateral forces of the disc cutters increase.