Geotechnically complex formations include materials such as conglomerates, agglomerates, glacial tills and melanges, which are very common geological units and are often defined to be “bimrocks” (block in matrix rocks), “bimsoils” (block in matrix soils) and “SRM” (soil-rock mixtures) in the literature. The term bimrock (block in matrix rocks) was coined by Medley in order to identify heterogeneous materials with hard rock blocks enclosed in a softer matrix of finer texture. Bimrocks are of great importance as the strength contrast that exists between the rocks and the matrix deems them quite significant in the geotechnical context. Their presence has often caused severe economic challenges during construction works, because of their poor characterization.