عنوان مقاله [English]
The aim of this paper is to study the effect of spacing of the joint from ‘u’ shape cutter on the fracture mechanism and to investigate the effect of joint angularity under ‘u’ shape cutter loading on the shear failure mechanism. For this purpose nine sample with dimension of 5 cm *10 cm*10cm consisting non-persistent joints were prepared. The first sets of three specimens have one non-persistent joint with length of 2cm and angularity of 0, 45 and 90. The spacing between joint and top of the sample was 2cm. The second sets of three specimens have one non-persistent joint with length of 2cm and angularity of 0, 45 and 90. The spacing between joint and top of the sample was 4cm. The third sets of three specimens have two non-persistent joint with length of 2cm and angularity of 0, 45 and 90. The spacing between upper joint and top of the sample was 2cm and the spacing between lower joint and upper joint was 2cm. the samples were tested under loading rate of 0.01 mm/s. concurrent with experimental investigation, numerical simulation were performed on the non-persistent joint using FRANC2D. the results shows that the spacing between joint and specimen edge and joint angularity have important effect on the crack growth mechanism. Also, failure mode and failure pattern in experimental test and numerical simulation are similar.
Bejari, Hadi, 2013. Simultaneous effects of joint spacing and orientation on TBM cutting efficiency in jointed rock masses. Rock Mech. Rock Eng. 46, 897–907
Bejari, H., Kakaie, R., Ataei, M., 2011. Simultaneous effects of joint spacing and joint orientation on the penetration rate of a single disc cutter. Min. Sci. Technol. 21 (4), 507–512
Balci, C., Tumac, D., 2012. Investigation into the effects of different rocks on rock cuttability by a V-type disc cutter. Tunn. Undergr. Space Technol. 30, 183–193
Chen, L., Liu, J., Wang, C., Liu, J., Su, R., Wang, J., 2014. Characterization of damage evolution in granite under compressive stress condition and its effect on permeability.Int. J. Rock Mech. Min. Sci. 71, 340–349
Cho, J.W., Jeon, S., 2010. Optimum spacing of TBM disc cutters: a numerical simulation using the three-dimensional dynamic fracturing method. Tunn. Undergr. Space Technol. 25, 230–244
Cho, J.W., Jeon, S., 2013. Evaluation of cutting efficiency during TBM disc cutter excavation within a Korean granitic rock using linear-cutting-machine testing and photogrammetric measurement. Tunn. Undergr. Space Technol. 35, 37–54
Choi, S. O. and 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 (2015) 19(4):1129-1138.
Gong, Q.M., Zhao, J., Jiao, Y.Y., 2005. Numerical simulation of influence of joint orientation on rock fragmentation process by TBM cutters. Tunneling and Underground Space Technology 20 (2), 183–191.
Gong, Q.M., Jiao, Y.Y., Zhao, J., 2006. Numerical simulation of influence of joint spacing on rock fragmentation by TBM cutters. Tunneling and Underground Space Technology 21 (1), 46–55.
Innaurato, N., Oggeri, C., Oreste, P.P., Vinai, R., 2011. Laboratory tests to study the influence of rock stress confinement on the performances of TBM discs in tunnels. Int. J. Min. Met. Mater. 18 (3), 253–259
Jeong, H.Y., 2013. A numerical study on rock cutting by a TBM disc cutter using SPH code.Journal of Korean Tunnelling and Underground Space Association, Vol. 15(3). pp. 345-356.
Lee, S.J., Choi, S.O., 2011. Numerical Analysis on Cutting Power of Disc Cutter with Joint Distribution Patterns. Journal of Korean Society for Rock Mechanics, TUNNEL & UNDERGROUND SPACE, Vol. 21, No. 3, pp. 151-163.
Lee, Seung-Joong. Choi, Sung O. 2009. Numerical Analysis on Fragmentation Mechanism by Indentation of Disc Cutter in a Rock Specimen with a Single Joint. TUNNEL & UNDERGROUND SPACE, Vol. 19, No. 5, 2009, pp. 440-449.
SUN, J.S., 2011. Numerical simulation of influence factors for rock fragmentation by TBM cutters. Rock and Soil Mechanics, Vol. 32. No. 6. pp. 1891-1897.
Tumac, D., Balci, C., 2015. Investigations into the cutting characteristics of CCS type disc cutters and the comparison between experimental, theoretical and empirical force estimations. Tunn. Undergr. Space Technol. 45, 84–98
Tuncdemir, H., Bilgin, N., Copur, H., Balci, C., 2008. Control of rock cutting efficiency by muck size. Int. J. Rock Mech. Min. Sci. 45, 278–288
Xiao, N., Zhou, X., Gong, Q., 2017. The modelling of rock breakage process by TBM rolling cutters using 3D FEM-SPH coupled method. Tunn. Undergr. Space Technol. 61, 90–103
Yang, H., Wang, H., Zhou, X., 2015. Analysis on the rock-cutter interaction mechanism during the TBM tunneling process. Rock Mech. Rock Eng. 49, 1073–1090
Yang, K., Xia, Y.M., Wu, Y., 2014. Studies on rock-breaking of positive disc cutter and edge disc cutter. Appl. Mech. Mater. 508, 159–164
Zhang, Z., Meng, L., Sun, F., 2014. Wear analysis of disc cutters of full face rock tunnel boring machine. Chin. J. Mech. Eng. 27, 1294–1300.