基于隧道工程实例的TBM破岩特征参数研究

为评价TBM的破岩性能、反馈滚刀破岩载荷、预警TBM卡机风险，提出采用破岩系数表征宏观TBM多滚刀协同破岩特征，采用切割系数表征细观单滚刀破岩特征。通过TBM破岩系数与滚刀切割系数关系推导，得出宏观上反映TBM推力和转矩相关性的破岩系数与细观上反映滚刀垂直力和滚动力相关性的切割系数在数值上相等，且仅与贯入度和滚刀直径有关；通过多个TBM工程现场数据验证，得到TBM破岩系数与滚刀切割系数均随滚刀贯入度的增大呈幂函数关系，TBM破岩系数在数值上明显比滚刀切割系数小，但二者呈高度线性关系，表明破岩系数与切割系数关系的理论推导研究方法的正确性。该研究建立的破岩系数、切割系数、贯入度等参数间的相关性对于预测和评价TBM的破岩性能大有益处。

Research on TBM Rock Breaking Characteristic Parameters Based on Tunnel Projects

In order to evaluate the rock breaking performance of tunnel boring machine (TBM), feedback the rock breaking load of the disc cutter, and warn the risk of the TBM jamming, the rock breaking coefficient is used to represent the rock breaking characteristics of TBM, and the cutting coefficient is used to represent the rock breaking characteristics of single disc cutter. The rock breaking coefficient reflects TBM thrust and torque correlation on a macro scale, on the other hand, the cutting coefficient reflects the correlation between the disc cutter vertical force and rolling force on a meso scale. By deriving the relationship between the TBM rock breaking coefficient and the disc cutter cutting coefficient, it is found that the rock breaking coefficient and the cutting coefficient are numerically equal, and only related to penetration and disc cutter diameter. By validating multiple TBM engineering field data, it is found that both TBM rock breaking coefficient and disc cutter cutting coefficient show power function with the penetration. While, the TBM rock breaking coefficient is obviously smaller than disc cutter cutting coefficient, but the two are highly linear, which shows that the theoretical derivation of the relationship between the rock breaking coefficient and the cutting coefficient is correct. The correlation among parameters such as rock breaking coefficient, cutting coefficient and penetration established in this paper is of great benefit in predicting and evaluating rock breaking performance of TBM.