基于Drucker-Prager的TBM刮刀-岩土作用过程有限元分析

FEM Analysis on the TBM Scraper-Soil Interaction Process Based on Drucker-Prager

针对TBM(tunnel boring machine)刮刀受力情况以及工作过程进行了理论分析及仿真研究,建立了刮刀切削岩土时土体和刮刀的受力模型.基于Drucker-Prager屈服与破坏准则建立了仿真中模拟的岩土的损伤本构模型,以沈阳地铁隧道工程中EPBΦ6.28 m型TBM为例验证了刮刀-岩土有限元模型设置的准确性.对刮刀切割岩土过程进行仿真,探讨并总结了了切削深度以及切削前角等工作参数的变化对仿真结果的影响.对刮刀受力和实际磨损量分析,发现刮刀受力与实际磨损情况相符合,验证了仿真结果,为TBM刮刀的工作机理研究提供了有意义的理论参考与试验依据.

Theoretical analysis and simulation research were carried out to explore TBM scraper force condition and working process. And a force model of the scraper and rock while they were interacting was established. A geotechnical damage constitutive model was established based on the Drucker-Prager yield and failure criterion. The established FEM model was verified by the real tools of EPB φ6.28 m full-face TBM, which were used in Shenyang subway project. Influences of different working parameters in the cutting process, such as cutting depth and rake angles were discussed and summarized by simulating the scraper working process. The results were verified by the fact that the scraper forces conformed to the wear pattems, which provided significant research theory and experimental reference for the working mechanism of TBM scraper.