中文摘要：

摘要TBM工法因其安全、经济和快速的特点成为隧道工程施工发展的一大方向。不论从施工过程方面还是从经济成本方面来讲，刀盘和刀具的研究均是TBM研究的核心问题。文章采用离散元PFC建立滚刀破岩数值力学模型，通过滚刀破岩裂缝数量、宽度、深度及延伸长度来判断不同形状尺寸滚刀的破岩效果，基于滚刀受力与贯入度关系曲线多峰值跃进特征，以及以两滚刀裂缝贯通为基准，得出不同岩性条件下合理的贯入度及与其匹配的最优滚刀间距。研究成果对不同岩性条件下TBM隧道优化掘进参数提供了有益参考。

英文摘要：

The TBM method has become the standard of tunnel construction by virtue of its safety, economy and speed. Studies on the cutter head and cutters are central to the TBM method in terms of both construction process and economic cost. A mechanical and numerical model of a cutter breaking rock was established by the PFC meth- od, which determines the rock-breaking effect of cutters of different sizes in terms of the number of cracks as well as their width, depth and extending lengths. Appropriate cutter penetration and the corresponding optimal cutter spac- ing for different rock lithologies were obtained based on the multiple leaping characteristics of peak values of the re- lationship curve of cutter force and penetration as well as the through cracks between two cutters. The results pro- vide a reference for the optimization of driving parameters of TBM tunnels with different lithologies.