Determination of the Uniaxial Compressive Strength of Rocks from the Strength Index

The uniaxial compressive strength (UCS) is classified as one of the basic mechanical properties rocks, which widely used in mining and construction practice. For example, it allows geomechanics to classify individual rocks soils into groups with same or similar properties. An example (RMR) Rock Mass Rating, Barton’s Q system. [1,2]. As a rule, only an indicative determination sufficient for this classification. determined laboratory on regular test pieces. preparation these bodies often time-consuming costly process, some cases, recommended shape cannot be prepared small amount rock sample or, case highly fractured friable rock. reason, alternative methods determining are being sought. These supposed faster cheaper provide results directly situ. paper presents information obtained from indirect according index measured field press various types Czech Republic. Keywords: Point load index; testing; Uniaxial strength.