Effect of rock discontinuities on certain rock strength and fracture energy parameters under uniaxial compression

Tsoutrelis, CE; Exadaktylos, GE

dc.contributor.author	Tsoutrelis, CE	en
dc.contributor.author	Exadaktylos, GE	en
dc.date.accessioned	2014-03-01T01:09:22Z
dc.date.available	2014-03-01T01:09:22Z
dc.date.issued	1993	en
dc.identifier.issn	09603182	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10937
dc.subject	fracture mechanics	en
dc.subject	Rock discontinuities	en
dc.subject	scale effect	en
dc.subject	stability	en
dc.subject	uniaxial compression	en
dc.subject.other	discontinuity	en
dc.subject.other	fracture energy	en
dc.subject.other	fracture mechanics	en
dc.subject.other	rock strength	en
dc.subject.other	stability	en
dc.subject.other	uniaxial compression	en
dc.title	Effect of rock discontinuities on certain rock strength and fracture energy parameters under uniaxial compression	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/BF00423337	en
heal.identifier.secondary	http://dx.doi.org/10.1007/BF00423337	en
heal.publicationDate	1993	en
heal.abstract	Five series of test blocks of Pendeli marble with artificially created discontinuities of different crack densities (simulating three mutually orthogonal joint sets) were tested in uniaxial compression in order to study the effect of discontinuities on: (a) the compressive strength and the modulus of elasticity, and (b) certain fracture energy parameters expressed by the ratio WA/WV, where WA is the surface energy and WV the volume elastic strain energy. Mathematical relationships are derived similar to those suggested by other authors relating strength parameters to crack densities. Such relationships clearly show a reduction in strength with increased crack density. The experimental results obtained permit the extension of Persson's relation (which refers to ideal intact rock) to the more realistic case of discontinuous rock mass by introducing the appropriate term that takes into consideration the effect of rock mass discontinuities on the energy ratio WA/WV. A comparison between laboratory results and field observations was subsequently carried out assuming the rock mass to behave as a linearly elastic material, obeying the Hoek and Brown failure criterion. This comparison showed that laboratory results can be extended to larger scale. Furthermore, in order to predict the in situ strength and stability of a rock mass in uniaxial compression (which is of major importance in underground excavations) certain concepts are proposed based on laboratory tests, in situ investigations and first principles of linear elastic fracture mechanics. © 1993 Chapman & Hall.	en
heal.publisher	Kluwer Academic Publishers	en
heal.journalName	Geotechnical and Geological Engineering	en
dc.identifier.doi	10.1007/BF00423337	en
dc.identifier.volume	11	en
dc.identifier.issue	2	en
dc.identifier.spage	81	en
dc.identifier.epage	105	en