Estimation of UCS from PLT for sedimentary rocks, with emphasis to conglomerate and breccias

摘要

The uniaxial compressive strength (UCS) is one of the main parameter for rock mass characterization and classification, as well as in rock engineering practice. Although UCS testing has been standardized by the International Society for Rock Mechanics other parameters such as results from point load test, which is comparatively cheap and easy to apply, are most widely used. Various studies in the literature propose relationships between Is_(50) (from point load test) and UCS, thus objective of this study is to determine conversion factors relating Is_(50) and UCS for intact sedimentary rocks, as well as for conglomerates and breccias, since to those rocks, specimen with geometric characteristics for the USC test according to ISRM requirements can not be easily shaped.