基于ANSYS/Workbench的辐条式刀盘-地层耦合应力研究

Coupled Stress Research of Spoked Cutter-head and Stratum Based on ANSYS/Workbench

盾构刀盘与地层的相互作用是刀盘和刀具设计与优选的关键。对国内外富水砂卵石地层中盾构刀盘相互作用方面的研究进行了综述。针对北京地铁19号线08标段施工所面临的富水砂卵石地层,基于ANSYS/Workbench有限元分析软件,建立了该工况下的刀盘-地层耦合模型,并开展了仿真研究,得到了耦合作用条件下的应力分布特性,研究结果表明:该工况下盾构掘进过程中刀盘最大等效应力强度达2.58MPa,地层最大等效应力强度达1.91MPa;地层等效应力分布与刀盘应力分布基本规律一致:沿着半径增大方向逐渐增大,边缘处应力集中现象明显,最后依据模型等效应力分布规律对刀盘结构提出了优化设计方案。

The interaction between cutter head and stratum is the key to the design and optimization of cutter head and cutter.Firstly,this paper summarizes the research on cutter-head interaction of shield tunneling in water-rich sandy gravel stratum at home and abroad.Aiming at the water-rich sandy gravel stratum faced by the construction of the 08 section of Beijing Metro Line 19,based on ANSYS/Workbench finite element analysis software,the cutter-head-stratum coupling model under this condition is established,and the simulation research is carried out,and the stress components under the coupling condition are obtained.The results show that the maximum equivalent stress of cutter head is 2.58 MPa and the maximum equivalent stress intensity of the stratum is 1.91 MPa.The basic law of the distribution of the equivalent stress of the stratum is the same as that of the cutterhead.The stress concentration is obvious along the direction of the radius increasing.Finally,the optimization design scheme of cutterhead structure is proposed according to the model equivalent stress distribution law.