Mechanical Properties and Failure Patterns of Migmatized Gneiss with Metamorphic Foliation Under UCS Test

Excerpt

Preferentially oriented, primary structures within the rock matrix such as schistosity, foliation, lamination and/or cleavage are responsible for anisotropic behaviour in rocks (Singh et al. 1989; Ramamurthy 1993; Nasseri et al. 2003; Esamaldeen et al. 2014). For rocks with an anisotropic structure, their mechanical, hydraulic and/or seismic properties change and vary with different directions of loading (Agliardi et al. 2014). The irregular structure can also change the failure mode of the intact rock and influence secondary crack propagation. The mechanical behaviour of anisotropic rocks including the strength and deformation properties, as well as failure patterns of the rocks, has been studied by many researchers (Ramamurthy 1993; Nasseri et al. 2003; Ghazvinian et al. 2012; Basu et al. 2013; Esamaldeen et al. 2014; Plinninger and Alber 2015; Singh et al. 2015; Usol’tseva et al. 2017; Yin and Yang 2018). …