| Gradient modeling for cavities in geomechanics Chengzhi Qi1; 1BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE, Beijing, China; PAPER: 304/Geomechanics/Keynote (Oral) SCHEDULED: 12:20/Wed. 30 Nov. 2022/Similan 2 ABSTRACT: The gradient approach is applied to discuss disintegration and size effects in cavities and deep level tunnels in geomechanics. Previous results of classical theories are revisited and further extended by adjusting the newly introduced gradient coefficient which multiplies the gradient term and accounts for nonlocality and underlying microstructural heterogeneity. Qualitative comparison with related observations is discussed. References: G. Efremidis and E.C. Aifantis, Gradient elasticity and size effect for a pressurized thick hollow cylinder, J. Mechan. Behav. Mater. 15, 169-184, 2004. H.X. Chen, C.Z. Qi, G. Efremidis, M. Dorogov and E..C. Aifantis, Gradient elasticity and size effect for the borehole problem, Acta Mech. 229,3305-3318, 2018. G. Efremidis, N. Pugno and E.C. Aifantis, A proposition of a “self-consistent” gradient theory. J. Mech. Behav. Mater. 19, 15-29, 2009. H.X. Chen, C.Z. Qi, S. Wang and M.Y. Wang, A simple gradient model for zonal disintegration of the surrounding rock around a deep circular tunnel, Tunnel. Undergr. Space Technol. 91, 103006, 2019. https://doi.org/10.1016/j.tust.2019/103006. |
