Cutting tool wear in tunnel boring machine (TBM) affects the construction safety, time, and cost in tunneling engineering. To accurately calculate the wear of TBM cutting tools used in heterogeneous grounds, the wear coefficient was studied theoretically and using field experiments based on the tool wear model proposed by the Japanese Tunnelling Society (JTS). A trajectory weight-based wear coefficient was proposed along with a calculation method that enhanced the model’s adaptability to heterogeneous grounds. The conclusions were as follows: (1) The wear coefficients for cutting tools installed at different installation radii had to be calculated separately due to their dissimilar values in heterogeneous grounds. (2) Analysis of measured data proved that the distribution of strata in the excavation area, the wear coefficient of each ground, and the cutting tools installation radius all significantly influenced the heterogeneous ground wear coefficient. A comparison of results obtained using different calculation models showed that the model proposed in this paper was more suitable for the calculation of tool wear in heterogeneous soil strata. (3) When the JTS model and its optimization model were used, the wear of high and low cutting tools had to be calculated separately due to dissimilar wear. (4) Based on the example analyses, the wear coefficients for high rippers were 102.31–113.73 μm/km, for low rippers were 35.94–42.55 μm/km, and for scrapers were 38.60–40.34 μm/km. The wear coefficient of the low ripper and scraper was approximately 40% of that of the high ripper, and the correction coefficient for the outermost scraper and ripper was 1.2–1.4 and 2–3, respectively.

隧道掘进机（TBM）刀具磨损影响隧道掘进工程的施工安全、时间和成本。为准确计算在非均质地层中使用的TBM刀具的磨损，基于日本隧道学会（JTS）提出的刀具磨损模型，对磨损系数进行了理论研究和现场试验。提出了基于轨迹权重的磨损系数以及增强模型对异质地面适应性的计算方法。结论如下：（1）安装在不同安装半径的刀具磨损系数由于它们在异质地面上的值不同，必须分别计算。(2) 实测数据分析证明，开挖区地层分布，各地层磨损系数，刀具安装半径对非均质磨耗系数有显着影响。对不同计算模型所得结果的比较表明，本文提出的模型更适用于非均质土层中刀具磨损的计算。(3)使用JTS模型及其优化模型时，由于磨损不同，必须分别计算高低刀具磨损。(4) 根据实例分析，高裂土器的磨损系数为102.31-113.73 μm/km，低裂土器的磨损系数为35.94-42.55 μm/km，刮板的磨损系数为38.60-40.34 μm/km。低裂土器和裂土器的磨损系数约为高裂土器的 40%，最外层裂土器和裂土器的修正系数分别为 1.2-1.4 和 2-3。