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Abstract The strength and deformational behaviour of rocks under loading conditions are important in underground excavations, mining and every civil engineering constructions as it determines the stability of such structures. This study aims to augment the existing know-how on such behaviour through analysis of point load tests conducted on anisotropic rocks of metamorphic nature. Three types of anisotropic rocks named augen gneiss, granitic gneiss, psammitic schist, and greenschist from different formations of the Lesser and Higher Himalaya of Central Nepal have been investigated. It is observed that the point load index strength of the anisotropic rocks is related to their grain size and the loading angle with respect to the planes of anisotropy. The anisotropic index shows pronounced effects on the surface energy distribution of the samples on the application of stress.
Acharya et al. (Sun,) studied this question.
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