基于并行计算的盾构机刀盘三维切削仿真

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。     

The scheme design for the earth pressure balance shield cutterhead structure

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.     

城市核心区域地铁盾构施工洞内解体技术研究

为解决盾构施工时因接收端条件受限而无法进行正常接收的问题，盾构往往只能在洞内进行解体。对目前国内外最新的盾构洞内解体技术进行了总结，并对各种方案的适用性和优缺点进行了对比分析，得出了目前不同洞内解体技术之间最主要的适用条件差别在于刀盘前部是否存在可操作空间的结论。针对刀盘前部可操作空间的差别，提出了两套适用性较强的优化方案组合，并通过施工因素、经济因素、工期因素等多方面综合分析考虑，论证了盾构洞内解体技术在当前城市地铁建设中的可行性。