Study On 3D-Dynamic Simulation Of Shield Cutter

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.