面向高效推进的硬岩隧道掘进机前支撑刚度优化设计

Optimal Design of the Shielding Stiffness of a Tunnel Boring Machine for Excavation Efficiency Improvement

隧道开挖主要由硬岩隧道掘进机(Tunnel Boring Machine,TBM)的刀盘系统破岩过程和推进系统的推进过程实现,但破碎硬岩时刀盘的振动可导致推进效率的下降,也可造成关键部件的破坏。以TBM的抑振减损、高效推进为目标,开展了对其刀盘振动影响较大的前支撑刚度等参数的优化设计。首先,建立了TBM刀盘系统与推进系统的集中参数模型,分析了主要部件在破岩激励下的响应;其次,分别以刀盘的振动烈度和机器的推进能效比为目标函数,对前支撑刚度和推进刚度开展多目标优化,得到了优化问题的Pareto前沿;最后,通过对Pareto前沿进行拟合和采样,获取对应不同工况的前支撑刚度的取值空间。研究成果对工程实际中TBM的减振增效、优化设计具有指导意义。

The tunnel excavation can be realized by a tunnel boring machine (TBM) by using its cutterhead system to bore through rocks and its driven system to propel the machine forward. However, excessive vibration of the cutterhead caused by hard- rock boring can lead to a decrease of the excavation efficiency and possible failures of some important components. In order to reduce the vibration of TBM and improve its excavation efficiency, an optimal design of the shielding stiffness, which dominates the vibration of the cutterhead, is performed in this paper. Firstly, a lumped mass model of the cutterhead system and the driving system is established and the dynamic responses of main parts under rock boring excitations are analyzed. Secondly, with minimizing the cutterhead vibration and maximizing the propulsion efficiency as the objectives, the optimization of the shielding stiffness is performed and the corresponding Pareto front is obtained.Finally, the value space of the shielding stiffness is constructed through interpolating and sampling the optimization results.The optimal design process provides a guideline for the vibration control and efficiency improvement of TBMs in tunneling engineering.