Mechanical model of breaking rock and force characteristic of disc cutter

Abstract

According to the cutting characteristics of progressive spiral movement by rotary cutting of the disc cutter, using the broken theory of interaction of compression and shearing, the three-axis force rotary cutting mechanical model of disc cutter was established and the influence of installation radius, the phase difference and the cutter space on the mechanics of disc cutter were analyzed. The results show that on the same radial line of tunneling interface, the boring distance of cutting tools installed on a different radius is not equal. The cutting radial line of tunneling interface is a polyline and its height is determined by phase angle and penetration of cutting tools. Both phase difference and the installation radius between adjacent disc cutters have little effect on the vertical force and rolling force, but increase with the increase in cutter spacing. In addition, when increasing phase difference and cutter space bilaterally, and reducing installation radius simultaneously, the lateral force would be improved. Related results have been verified on100 t rotary tool cutting test platform.

Keywords

mechanical model / phase angle / installation radius / cutter space / disc cutter

References

[1] SONG Ke-zhi, YUAN Da-jun, WANG Meng-shu. Study review on the interaction between disc cutter and rock [J]. Journal of Rail Way Engineering Society, 2005(6): 66–69. (in Chinese)

[2] SaffetY.. Utilizing rock mass properties for predicting TBM performance in hard rock condition [J]. Tunnelling and Underground Space Technology, 2008, 23(3): 326-339

[3] HuoJ.-z., ShiY.-j., TengH.-f., ChaiR.-f., ZhangL.-hua.. Cutter layout design of full-face rock tunnel boring machine (TBM) [J]. Journal of Mechanical Engineering, 2008, 19(15): 1832-1836

[4] ZhangZ. X.. Technical note estimate of loading rate for a TBM machine based on measured cutter forces [J]. Rock Mechanics and Rock Engineering, 2004, 37(3): 239-248

[5] MrouehH., ShahrourI.. A simplified 3D model for tunnel construction using tunnel boring machines [J]. Tunneling and Underground Space Technology, 2008, 23(1): 38-45

[6] GertschR., GertschL., RostamiJ.. Disc cutting tests in colorado red granite: Implications for TBM performance prediction [J]. International Journal of Rock Mechanics & Mining Sciences, 2007, 44(2): 238-246

[7] CiglaM., OzdemirL.. Computer modeling for improved production of mechanical excavators [C]. Proceedings of the Annual Meeting of the Society for Mining, 2000Salt Lake CityMetallurgy and Exploration (SME)1-12

[8] AcarogluO.. A fuzzy logic model to predict specific energy requirement [J]. Tunnel and Underground Space Technology, 2008, 10(6): 10-16

[9] ChangS., ChoiS., BaeG.. Performance prediction of TBM disc cutting on granitic rock by the linear cutting test [J]. Tunnelling and Underground Space Technology, 2006, 21: 271-279

[10] ZhangZ.-h., JiC.-ming.. Analytic solution and its usage of arc length of rock breakage point of disc edge on full face rock tunnel boring machine [J]. Journal of Basic Science and Engineering, 2009, 17(2): 265-273

[11] ZhangH.-m., WuX.-g., ZengW.-hua.. Study on tunneling experiment and mathematical model of EPB shield. Chinese [J] Journal of Rock Mechanics and Engineering, 2005, 24(2): 5732-5766

[12] WanZ.-c., ShaM.-y., ZhouY.-ling.. Study on disk cutters for hard rock-Application of TB880E TBM in Qin-ling Tunnel(1) [J]. Modern Tunnelling Technology, 2002, 39(5): l-11

[13] ChikaosaT., ShunichiroY., KimikazuT.. A study on cutter wear and mechanical properties of rocks in tunneling with a TBM [J]. Journal of the Society of Materials Science, 2006, 55(1): 29-36

[14] XiaY.-m., ZhouX.-w., LiuY.-j., WuDun.. Study on cutters layout rules of EPB shield cutter-head [J]. Natural Science Journal of Xiangtan University, 2009, 31(4): 93-96

[15] EvansI., PomeryC. D.The strength fracture and workability of coal [M], 1966LondonPergamon Press

[16] ROSTAMI J, OZDEMIR L. A new model for performance prediction of hard rock TBMs [C]// Rapid Excavation and Tunneling Conference (RETC) Proceedings. Boston, 1993: 793–809.

[17] ZuoY.-j., LiX.-b., ZhouZ.-long.. Determination of ejection velocity of rock fragments during rock burst in consideration of damage [J]. Journal of Central South University of Technology, 2005, 12(5): 618-622

[18] CaoW.-g., LiX., ZhaoHeng.. Damage constitutive model for strain-softening rock based on normal distribution and its parameter determination [J]. Journal of Central South University of Technology, 2007, 14(5): 719-724