Analysis of Tunnel Rock Cutting by Diamond Wire Saw Blade Using a Finite Element Model

초록

Different engineering applications including mining, tunnelling, etc. uses mechanical rock cutting process. Rock cutting is the principle work performed for the tunnelling. Various types of rock cutting process are performed this days (i.e., sawing, rotary blade, drilling etc.) Diamond wire saw have played an important role in recent decades, to perform the cutting process of rock. Diamond wire saw cutting process is widely used for rock excavation because of their high flexibility, high production rate, low noise level, low cost and high energy efficiency, particularly when compared to circular saws. In the process of rock cutting with diamond wire, beads are the most important part of this machine. Because beads are the responsible for the cutting of the rock particles. And diamond particles are place in the surface of the beads steel body. When this diamonds come contact with the rock surface with certain velocity, rock particles removes from the work piece. It is really time consuming and costly to find out the efficient cutting process with diamond material in the lab experiment. Thus, numerical simulation is one of the best solution to find out the nearest possible result which can useful in the real situation. In this paper the process of whole cutting process have been simulated with LS-DYNA finite element method. With the recent development of computer technology, FEM method in cutting process is most commonly used. There are basically two kind of methods for FEM process, that is Lagrange method and the Euler method. Lagrange method is used for solid structure of stress strain analysis, Euler method is used for fluid analysis. In this paper Lagrange method is adopted for stress strain analysis after the cutting process of the work piece. The result provides the theoretical methods of the diamond wire sawing for the rock cutting. A 2D method has been adopted in this study, which can be used as a future reference while doing the 3D design and with different rock of types. Thus the result could give us various options in the laboratory experiments. This is the main goal from this study.