异形全断面盾构偏心刀盘试验研究

Experiment Research on Eccentric Cutterhead of Special-shaped Shield

利用有限元仿真和实验研究,分析了异形全断面盾构偏心刀盘结构的受力情况,并进行了优化。首先通过有限元仿真方法研究了偏心刀盘堵转时的应力分布,发现轴承和止推螺母是强度薄弱环节。根据有限元分析结果,设计了相应的实验装置,对异形全断面盾构偏心刀盘进行了堵转实验,止推螺母被拉断。最后,结合有限元分析和实验结果,对偏心刀盘进行了优化,结果表明,通过改进的偏心刀盘,强度满足施工要求。本研究方法为复合地层下异形盾构偏心刀盘的结构设计提供了参考依据。

Based on finite element simulation and experiment research,the stress of the eccentric cutterhead of full-face cutting quasi-rectangular shield is analyzed and the structure is optimized.It is found that the bearings and the thrust nuts are weak parts of strength according to the stress distribution analyzation of the eccentric cutterhead under locked rotor conditions.And the corresponding experimental device is set up.The thrust nuts were pulled off in the locked-rotor experiment.Finally,combined with the finite element analysis and experimental results,the eccentric cutterhead structure is optimized.The results show that the strength of the improved eccentric cutterhead meets the construction requirements.This research method provides a reference for the structural design of the special-shaped shield eccentric cutterhead.