为了解决土岩复合地层盾构掘进速度难以预测的难题，结合滚刀破岩过程和刀盘受力特征，分析复合地层滚刀破岩机理和复合地层对盾构掘进性能的影响；而后，基于深圳地铁12号线，收集掘进参数、地层参数、渣土等信息，确定土岩复合地层掌子面信息，建立包含9个土岩复合地层区间段的数据库；最后，通过多元非线性回归分析，提出以掌子面土体占比和岩层掘进速度均值为主要影响参数的土岩复合地层掘进速度预测模型。预测模型的掘进速度预测值与实测值之间的相关性系数为0.85，预测结果可靠。通过模型参数分析，掌子面土体占比超过临界值0.8后，盾构掘进速度变化异常敏感，低于临界值时，掘进速度缓慢降低，并趋于岩层掘进速度均值。研究成果可为土岩复合地层盾构施工参数优化和施工规划提供参考。

To solve the problem of unpredictable penetration rate in soil-rock mixed ground for shield TBM. Combining the rock breakage process of the rolling cutter and the force characteristics of the cutterhead, the rock breakage mechanism of the mixed ground and the impact of the mixed ground on shield TBM tunnelling performance was analyzed. Then, based on Shenzhen Metro Line 12, information on operating parameters, geological parameters, and muck parameters was collected, the tunnel face information of the soil-rock mixed ground was obtained, and then a database containing 9 interval sections of soil-rock mixed ground was established. Finally, by multiple non-linear regression analyses, the penetration rate prediction model of the soil-rock mixed ground with the ratio of soil in the tunnel face and the penetration rate of rock ground as the main influencing parameters was proposed. The correlation coefficient between the predicted values and measure values of the penetration rate of this new model is 0.85, and the model prediction results are reliable. The parametric analysis of the model show that the change of the penetration rate is extremely sensitive while the ratio of soil in the tunnel face exceeds the critical value of 0.8. On the contrary, the penetration rate slowly decreases and tends to the average penetration rate of the rock ground. The research results can provide a reference for the optimized construction parameters and developed construction planning of shield TBM tunnelling in the soil-rock mixed ground.