Abierdi1, Yuzhou Xiang2, Haiyi Zhong2, Xin Gu2, Hanlong Liu2, 3, Wengang Zhang2, 3, *
CMC-Computers, Materials & Continua, Vol.63, No.2, pp. 825-844, 2020, DOI:10.32604/cmc.2020.07946
Abstract Tunnel excavation is a complicated loading-unloading-reloading process
characterized by decreased radial stresses and increased axial stresses. An approach that
considers only loading, is generally used in tunnel model testing. However, this approach is
incapable of characterizing the unloading effects induced by excavation on surrounding rocks
and hence presents radial and tangential stress paths during the failure process that are different
from the actual stress state of tunnels. This paper carried out a comparative analysis using
laboratory model testing and particle flow code (PFC2D)-based numerical simulation, and shed
light upon the crack propagation process and, microscopic stress and force chain variations… More >
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