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针对盾构机工作时刀盘切削土体的数值仿真,建立了细致分析模型,并利用任意拉格朗日欧(ALE)和流固耦合(FSI)理论及方法未解决传统有限元方法进行切削仿真时易引发的网格大变形问题;在国产曙光4000A超级计算机上利用LS-DYNAMPP970完成了并行计算,采用了传统递归坐标对分、以夏根据仿真模型特点提出的基于耦合均衡坐标对分等两种区域分解策略。结果表明,ALE-FSI方法能有效处理刀盘切割土体仿真时的网格大变形,仿真数据与试验数据对比也比较一致:通过促进负载均衡,在计算时CBCB法比RCB法体现出了更好的加速比和并行效率。 相似文献
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The earth pressure balance (EPB) shield cutterhead structure, which features an opening ratio and opening distribution as a core, seriously affects tunneling stability and tunneling efficiency. This paper presents a new model for the soil using visco-plastic fluid theory, and then introduces the model into the computational-fluiddynamics model to comprehensively analyze the cutterhead structure, which consists of the soil, the cutterhead, the working chamber, and the screw conveyor. Based on this model, the stability situation and tunneling perfor- mance of multiple schemes of the cutting head structure are analyzed by changing the opening ratio and the opening distribution on the cutterhead. In this study, a new method for design and analysis of the EPB-shield cutterhead structure is proposed that fits changes in geologic conditions. The results will be helpful for engineers and manufacturers of more efficient machines and for carrying out tunneling projects with more stable EPB-shield cutterheads, and it will reduce the influences of changing geologic conditions during all stages of tunnel construction. 相似文献
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