【作者】 李娟；

【导师】 岳澄；

【作者基本信息】 天津大学 ， 固体力学， 2008， 硕士

【摘要】 在人口密集、城市化进程日益加速的今天，人们把越来越多的目光聚焦到地下空间的开发与利用。这就极大地促进了隧道及地下工程修建技术的发展和应用。在隧道及地下工程众多的修建方法中，盾构法隧道施工技术以其机械化施工、对周围环境影响较小等优点在世界各国被广泛应用。而在盾构法施工过程中位于盾构机最前端的盾构刀盘通过刀盘上的刀具对前方的土体进行切削来完成掘进开挖的任务。所以研究盾构刀具切削土壤的机理对于盾构刀盘的设计有着重要的意义。本文的具体内容包括：1、研究了近十几年来国内外对于刀具切削研究的发展状况和重点方向，以及各种盾构刀具各自的工作原理、适用范围和相互之间的配置形式。2、针对刀具切削土壤过程中出现的土壤大变形问题，将Lagrange、ALE、EFG等三种典型方法做了较深层次的研究，并分别使用了这三种方法对上海典型的软粘土壤切削过程进行仿真模拟分析。分析了三种方法在土壤切削过程中各自的特点和优势，就其计算结果及计算时间等因素进行权衡比对，其中ALE方法在软粘土刀具切削仿真中得到的结果与理论数据较为一致。此外，对于这三种方法在土壤切削仿真的过程中常出现的问题进行了总结并给予了一定的解决方法和建议。3、使用流固耦合理论以及ALE算法进一步对盾构刀具在各种工况下对土壤切削过程进行数值模拟。得到了切削过程中刀具—土壤的接触力随切深、刀刃角、后角、速度等因素改变时的变化规律，其结果与相关理论对比，较为吻合，为盾构刀盘的设计提供了相关的理论依据。更多还原

【Abstract】 Nowadays, as the population is getting crowded and the process of urbanizationis getting faster, people are more focusing on the exploitation and utilization ofunderground space. This trend, in turn, has greatly promoted the development andapplication of tunnel and underground civil engineering technology. From numerousmethods for tunnel and underground engineering, the shield method is increasinglyused all over the world due to its advantage of mechanization and little impact on theenvironment. When the shield machine works in the course of construction, shieldcutting pan, at the top of the shield machine takes responsibility of excavation taskwith its cutters cutting soil. Hence, research of the shield cutters cutting soilmechanism plays a very important role in the design of shield cutting pan.The specific content of this paper include:1. The development and major trend of the cutter cutting soil mechanism overthe past decade at home and abroad, the shield cutter’s respective work principles,scope of application, and the combination schemes of different cutters have beenstudied.2. Against the large deformation of soil in the course of the shield cutters cuttingsoil, three typical formulations named Lagrange, ALE and EFG have been deeplyconsidered, and respectively used to simulate the course of the shield cutter cuttingsoil. The features and advantages of these three different formulations have beenanalyzed and pointed out respectively. With the three formulations’calculation resultsand computing time being balanced, it was found that some results from thesimulation with the soft clay by the ALE formulation were in good accordance to thetheory. In addition, when the three formulations were used to simulate the course ofthe shield cutter cutting soil, a number of problems were often arisen. In this paper,these problems were summed up, and the solutions to them were generalized.3. The theory of Fluid-Structure interaction and the ALE formulation wereemployed further to simulate the soil cut by the shield cutter under different situations.Contact force’s changing rules under the influence of the change of some factors such as cutting depth, cutting edge angle, clearance angle and cutting speed weregeneralized. As the simulation results were in good accordance to the theory, theyprovide theory for the design of shield cutting pan.更多还原