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http://dx.doi.org/10.9711/KTAJ.2020.22.4.383

A numerical study on the optimum spacing of disc cutters considering rock strength and penetration depth using discrete element method  

Lee, Sang Yun (Dept. of Civil Engineering, Inha University)
Song, Ki-il (Dept. of Civil Engineering, Inha University)
Jung, Ju Hwan (Next Generation Transmission & Substation Lab., KEPCO Research Institute)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.22, no.4, 2020 , pp. 383-399 More about this Journal
Abstract
Optimizing the spacing of the disc cutter is a key element in the design of the TBM cutter head, which determines the drilling performance of the TBM. The full-scale linear cutting test is known as the most reliable and accurate test for calculating the spacing of the disc cutter, but it has the disadvantage of costly and time-consuming for the full-scale experiment. In this study, through the numerical analysis study based on the discrete element method, the tendency between Specific Energy-S/P ratio according to uniaxial compression strength and penetration depth of rock was analyzed, and the optimum spacing of 17-inch disc cutter was derived. To examine the appropriateness of the numerical analysis model, the rolling force acting on the disc cutter was compared and reviewed with the CSM model. As a result of numerical analysis for the linear cutting test, the rolling force acting on the disc cutter was analyzed to be similar to the rolling force derived from the theoretical formula of the CSM model. From the numerical 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 rock strength increases. And it can be concluded that 80~100 mm of disc cutter spacing is the optimum range having minimum specific energy regardless of rock strength. This tends to coincide with the optimal spacing of previously reported disk cutters, which underpins the disk cutter spacing calculated through this study.
Keywords
Disc cutter; Linear cutting machine; TBM; Discrete element method; PFC3D;
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1 Acaroglu, O., Ozdemir, L., Asbury, B. (2008), "A fuzzy logic model to predict specific energy requirement for TBM performance prediction", Tunnelling and Underground Space Technology, Vol. 23, No. 5, pp. 600-608.   DOI
2 Bakar, M.Z.A., Gertsch, L.S., Rostami, J. (2014), "Evaluation of fragments from disc cutting of dry and saturated sandstone", Rock Mechanics and Rock Engineering, Vol. 47, No. 5, pp. 1891-1903.   DOI
3 Chang, S.H., Choi, S.W., Bae, G.J., Jeon, S.W. (2007), "A parametric study of rock properties and mechanical cutting conditions for deriving an optimum design model of a TBM cutterhead equipped with disc cutters", Journal of The Korean Society of Civil Engineers, Vol. 27, No. 1C, pp. 87-98.
4 Cho, J.W., Jeon, S., Yu, S.H., Chang, S.H. (2010), "Optimum spacing of TBM disc cutters: A numerical simulation using the three-dimensional dynamic fracturing method", Tunnelling and Underground Space Technology, Vol. 25, No. 3, pp. 230-244.   DOI
5 Choi, S.O., Lee, S.J. (2015), "Three-dimensional numerical analysis of the rock-cutting behavior of a disc cutter using particle flow code", KSCE Journal of Civil Engineering, Vol. 19, No. 4, pp. 1129-1138.   DOI
6 Gertsch, R., Gertsch, L., Rostami, J. (2007), "Disc cutting tests in Colorado Red Granite: Implications for TBM performance prediction", International Journal of Rock Mechanics and Mining Sciences, Vol. 44, No. 2, pp. 238-246.   DOI
7 Itasca Consulting Group (2019), PFC3D (particle flow code in 3 dimensions) manual.
8 Labra, C., Rojek, J., Onate, E. (2017), "Discrete/finite element modelling of rock cutting with a TBM disc cutter", Rock Mechanics and Rock Engineering, Vol. 50, No. 3, pp. 621-638.   DOI
9 Medel-Morales, R.C., Botello-Rionda, S. (2013), "Design and optimization of tunnel boring machines by simulating the cutting rock process using the discrete element method", Revista Computacion y Sistemas, Vol. 17, No. 3, pp. 329 -339.
10 Ministry of Land, Infrastructure and Transport (2015), Development of optimized TBM cutterhead design method and high-performance disc cutter, pp. 88-123.
11 Nilsen, B., Ozdemir, L. (1993). "Hard rock tunnel boring prediction and field performance", Proceedings of the Rapid Excavation and Tunneling Conference (RETC), Boston, pp. 833-852.
12 Sanio, H.P. (1985), "Prediction of the performance of disc cutters in anisotropic rock", International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Vol. 22, No. 3, pp. 153-161.   DOI
13 Potyondy, D.O., Cundall, P.A. (2004), "A bonded-particle model for rock", International Journal of Rock Mechanics and Mining Sciences, Vol. 41, No. 8, pp. 1329-1364.   DOI
14 Rostami, J., Ozdemir, L. (1993), "A new model for performance prediction of hard rock TBMs", Proceedings of the Rapid Excavation and Tunneling Conference (RETC), Boston, pp. 793-809.
15 Rostami, J., Ozdemir, L., Nilson, B. (1996), "Comparison between CSM and NTH hard rock TBM performance prediction models", Proceedings of the Annual Technical Meeting of the Institute of Shaft Drilling Technology, Las Vegas, pp. 1-10.
16 Shin, J.H. (2015), Geomechanics & Engineering-Analysis and Design, CIR Co. Inc., Seoul, pp. 580-608.