암반강도 및 압입깊이에 따른 디스크커터의 최적간격 산정을 위한 개별요소법 기반 수치해석 연구

Optimizing the spacing of the disc cutter is a key element in the design of the TBMcutter head, which determines the drilling performance of the TBM. The full-scalelinear cutting test is known as the most reliable and accurate test for calculating thespacing of the disc cutter, but it has the disadvantage of costly and time-consuming forthe full-scale experiment. In this study, through the numerical analysis study based onthe discrete element method, the tendency between Specific Energy-S/P ratio accordingto uniaxial compression strength and penetration depth of rock was analyzed, and theoptimum spacing of 17-inch disc cutter was derived. To examine the appropriatenessof the numerical analysis model, the rolling force acting on the disc cutter wascompared and reviewed with the CSM model. As a result of numerical analysis for thelinear cutting test, the rolling force acting on the disc cutter was analyzed to be similarto the rolling force derived from the theoretical formula of the CSM model. From thenumerical analysis on 5 UCS cases (50 MPa, 70 MPa, 100 MPa, 150 MPa, 200 MPa),it is found that the range of the optimum spacing of the disc cutter decreases as the rockstrength increases. And it can be concluded that 80~100 mm of disc cutter spacing isthe optimum range having minimum specific energy regardless of rock strength. Thistends to coincide with the optimal spacing of previously reported disk cutters, which underpins the disk cutter spacing calculated through this study.