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| Simulation analysis on cutting soil for cutter of EPB based on CEL method |
| QING Qi-xiang， YANG Hui， LIU Jie， WEI Fu-chao |
| College of Mechanical and Vehicle Engineering， Hunan University， Changsha 410082， China |
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Abstract In order to solve the complex nonlinear problems of convergence difficulties and severe concussions on cutting soil simulation for EPB cutter, a cutting finite element model was established based on the large-scale nonlinear finite element software and solved by using CEL method. The cutting force was about 80N when using CEL method, while the force was about 50N using the method of EF and ALE. So the result obtained via CEL method was closer to the theoretical result which was 78N and the result was less shocked also. Finally, it was also found that CEL had lower sensitivity to the grid size than EF and ALE by studying the influence of the finite element mesh size on the simulation results, which might contribute to improving the cutting efficiency. In summary, the proposed method is more suitable for the practical engineering situation.
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Received: 09 November 2014
Published: 28 June 2015
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基于CEL法的EPB切刀切削土体仿真分析
针对盾构机切刀切削土体仿真收敛困难、仿真结果震荡严重等复杂非线性问题，利用大型非线性有限元软件建立切刀切削土体有限元模型，并利用欧拉-拉格朗日耦合法(CEL法)对模型进行求解．利用CEL法得出的切削力大小约为80N，单元失效法（EF法）和自适应网格划分法（ALE法）的结果均约为50N，而利用理论公式计算出切削力大小约为78N，即文中方法结果更接近理论解．且发现CEL法得到的切削力比EF法和ALE法得到的结果收敛快、震荡小．最后，通过研究有限元网格大小对仿真结果的影响，发现CEL法相对于EF法和ALE法对网格大小敏感性低，一定程度上提高了切削土体计算效率．总之，所提出方法更适合工程实际中盾构机切刀切削土体仿真分析．
关键词：
CEL法,
复杂非线性,
切削,
网格大小,
敏感性
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