利用水射流对岩体进行预切缝是提高竖井全断面掘进机破岩效率、实现深部资源机械化开发的关键技术。针对预切缝位置及深度合理参数选取的难题，首先指出了锥面刀盘带动下滚刀破岩的工况特征，进而基于Cohesive单元方法，建立了预切缝条件下的滚刀破岩离散−连续耦合数值模型。以完整岩体为对照组，对比分析了不同预切缝距离和深度对滚刀破岩的受力特征和岩石破碎特征的影响规律。阐述了预切缝条件下，滚刀破岩时密实核形成、块状岩渣形成、Hertz裂纹扩展3个阶段性特征，指出了岩体的非对称破碎特性和不同区域岩渣的形成机制。最终从滚刀受力、破岩面积、破岩比能耗、岩渣破碎程度4个方面综合分析，确定了预切缝的最佳距离和深度取值范围。研究结果表明：预切缝可以显著减小竖井全断面掘进机滚刀破岩过程中的贯入力和侧向力。与完整岩体相比，贯入力峰值降低了44.0%～10.3%。侧向力峰值降低了35.2%～6.5%。预切缝间距及深度较小时，会限制滚刀破岩范围，同时使得破碎岩体块度更小，导致破岩比能耗增高。随着预切缝深度的增大，破岩体积先增大后趋于稳定，比能耗先减小后保持不变。最终，确定了切缝距离为70～90 mm，深度为60～80 mm时破岩效果最佳，破岩体积较无切缝时提高约1倍，破岩比能耗降低69.2 %。研究结果为刀盘辅助破岩装备的设计及参数确定提供了参考。

The combination of water-jet and disc-cutter rock breaking is a key technology to improve the rock breaking efficiency of the full-face shaft boring machine and achieve the mechanized development of deep resources. It is a crux problem of selecting reasonable parameters for pre-cutting kerfs. In this paper, firstly, it examined the working characteristics of rock breaking with a disc-cutter driven by a conical cutter-head. Then, based on the cohesive element method, a discrete-continuous coupled numerical model for rock breaking with a disc-cutter under pre-cutting kerfs conditions was established. Comparing the intact rock mass, the influence of different pre-cut kerfs distances and depths on the stress and rock fragmentation characteristics of the rock breaking was analyzed. The three stage characteristics of dense core formation, blocky rock slag formation, and Hertz crack propagation during rock cutting with a disc-cutter were elaborated. The asymmetric fragmentation characteristics of the rock mass and the formation mechanism of rock slag in different regions were presented. Finally, a comprehensive analysis was conducted from four aspects: the force acting on the disc cutter, the rock breaking area, the specific energy consumption for rock breaking, and the degree of rock slag crushing, and the optimal range of distance and depth values for pre-cutting kerfs was determined. The research results indicate that the pre-cutting kerfs can significantly reduce the penetration force and lateral force during the rock breaking process of the SBM cutters. Compared with intact rock masses, the peak penetration force decreased by 44.0%−10.3%. The peak lateral force decreased by 35.2%−6.5%. When the spacing and depth of pre-cut kerfs are small, it will limit the range of rock breaking by the disc-cutter, and at the same time make the fragmentation of the rock mass smaller, resulting in an increase in specific energy consumption for rock breaking. As the pre-cut depth increases, the rock breaking volume first increases and then tends to be stabilized, while the specific energy consumption first decreases and then remains unchanged. Finally, it was determined that the cutting distance was 70−90 mm, and the best rock breaking effect was achieved when the cutting distance was 60−80 mm. The rock breaking volume was doubled compared to the case without cutting, and the specific energy consumption for rock breaking decreased by 69.2%. This provides a reference for the parameter design and determination of the cutter head.