不同刀具配置下隧道掘进机高效破岩机理与推力预估

Rock-breaking mechanism of TBM with different types of cutter tools and estimation of thrust force

为解决隧道掘进机刀盘刀具破岩的安全性、可靠性、高效性这一隧道掘进机施工难题,从高效破岩机理和刀盘刀具与围岩耦合作用规律两个方面进行了研究,对单刀及多刀破岩理论体系进行了完善。结合理论分析和滚刀岩机作用综合实验台上的实验结果,提出了红砂岩、石灰岩和花岗岩等3种常见岩石的最优破岩刀间距,并给出了当岩石强度位于40～170 MPa之间时的最优刀间距计算式。综合考虑各种因素对隧道掘进机总推力、刀盘扭矩的影响,提出了复合式隧道掘进机总推力、刀盘扭矩估算的理论公式。通过工程实例验证,该理论计算式具有较高的科学性和精确性。研究成果可直接用于刀具选型布置、推力、扭矩设计,从而降低隧道掘进机的制造成本、提高施工效率。

The rock-breaking mechanism and the coupling effect rules between the cutter tool and the surrounding rock are studied in order to resolve the TBM construction problems of cutter breaking rock,such as security,reliability and efficiency.The optimal cutter spacings for some common rocks,such as red sandstone,limestone and granite,are put forward based on the theoretical analysis and experimental results from the experimental platform for the function between disc cutter and rock.A formula for the optimal cutter spacing is deduced while the rock strength is under 40~170 MPa.Meanwhile,the mechanism of rock-breaking under single-tool and multi-tool is improved.Considering the impact of various factors,a new method for estimating the total thrust force and cutter-head torque of compound TBM is proposed,and it is proved to be more scientific and accurate through practical projects.The test results can be used to select and arrange the cutters,to design thrust force and torque,to reduce the manufacturing cost of TBM and to increase the efficiency of construction.