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‘’Shear Strength of Rock Discontinuities Grouted with Epoxy Resin Mixtures’’ The present diploma thesis experimentally investigated the enhancement of the shear strength of rock discontinuity using water-soluble epoxy resin. The rock used is the Tranovaltou Kozani marble. The rock was cut in the rock mechanics laboratory using a diamond wheel. After the cutting process was completed, 24 samples were obtained. The discontinuity of each sample was created artificially by using a wheel so that the surface of the sample is smooth. The resin was dissolved in water of six specific ratios in total. More specifically, the first ratio contained only resin, the second 3 resin and 1 water, the third 2 resin and 1 water, the fourth 1 resin and 1 water, the fifth 1 resin and 1.5 water and finally the sixth 1 resin and 2 water. Each mixture with the same ratio of epoxy resin to water embedded four specimens. After seven days of injection, each quartet of specimens with the same ratio of resin to water was subjected to a direct shear test. During the direct shear test, four normal stresses were applied, namely 200 kPa, 400 kPa, 600 kPa and 800 kPa respectively. After completing all the tests, the results obtained, i.e. the shear strength, the friction angle, and the cohesion, from the etching of the surrounding Coulomb, were compared with the results of the direct shearing of the ungrouted rock. Important conclusions were drawn regarding the possibility of using this material to improve the shear strength of rock mass.