Pillar failure by axial splitting in brittle rocks

Exadaktylos, GE; Tsoutrelis, CE

dc.contributor.author	Exadaktylos, GE	en
dc.contributor.author	Tsoutrelis, CE	en
dc.date.accessioned	2014-03-01T01:11:25Z
dc.date.available	2014-03-01T01:11:25Z
dc.date.issued	1995	en
dc.identifier.issn	0148-9062	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11625
dc.subject	Failure Mechanism	en
dc.subject	Field Data	en
dc.subject	Potential Energy	en
dc.subject	Scale Effect	en
dc.subject	Stable Models	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Mining & Mineral Processing	en
dc.subject.other	axial splitting	en
dc.subject.other	brittle rock	en
dc.subject.other	elastic model	en
dc.subject.other	excavation	en
dc.subject.other	excavations	en
dc.subject.other	failure initiation stress	en
dc.subject.other	fracture spacing	en
dc.subject.other	pillar failure	en
dc.subject.other	pillar failure mechanism	en
dc.subject.other	scale effect	en
dc.subject.other	Approximation theory	en
dc.subject.other	Blasting	en
dc.subject.other	Brittleness	en
dc.subject.other	Cracks	en
dc.subject.other	Failure (mechanical)	en
dc.subject.other	Failure analysis	en
dc.subject.other	Fracture	en
dc.subject.other	Mathematical models	en
dc.subject.other	Stability criteria	en
dc.subject.other	Strength of materials	en
dc.subject.other	Stress analysis	en
dc.subject.other	Stresses	en
dc.subject.other	Axial splitting	en
dc.subject.other	Brittle rocks	en
dc.subject.other	Elastic stresses	en
dc.subject.other	Multiple underground openings	en
dc.subject.other	Pillar failure	en
dc.subject.other	Rocks	en
dc.title	Pillar failure by axial splitting in brittle rocks	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0148-9062(95)00013-7	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0148-9062(95)00013-7	en
heal.language	English	en
heal.publicationDate	1995	en
heal.abstract	An analytical approximate elastic model is presented of the pillar failure mechanism in the case of multiple underground openings in brittle rocks by parallel equidistant vertical splitting cracks forming slabs, which are assumed to buckle. The failure region is considered to be elliptical in shape with the major axis growing as failure proceeds parallel to the minimum applied principal stress. A modified solution for the potential energy loss due to the presence of an elliptical hole in an infinite elastic space was derived in order to account for multiple openings. This solution, which yields the failure initiation stress and the crack spacing, was achieved by inserting configuration correction factors estimated by considering certain limiting conditions. In order to obtain simple approximate formulae and after considering the blast damage effect, equivalent effective circular holes are assumed for the case of square openings and elliptical holes for the case of rectangular openings. Next, the stable mode of pillar failure was formulated based on the observation that the weak inclusion of the axially split rock mass reduces the stresses for some distance inside the pillar. The stable model was obtained first by computing the elastic stresses outside the failure zone using a circular approximation and then applying a stability criterion based on Huber's classical fracture hypothesis. Comparison of the theoretical results with field data concerning a bauxite mine using room and pillar have indicated reasonable agreement. Furthermore, the scale effect exhibited by the strength and the axial splitting crack spacing was predicted sufficiently well by the above model. © 1995.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	International Journal of Rock Mechanics and Mining Sciences and	en
dc.identifier.doi	10.1016/0148-9062(95)00013-7	en
dc.identifier.isi	ISI:A1995RR67600002	en
dc.identifier.volume	32	en
dc.identifier.issue	6	en
dc.identifier.spage	551	en
dc.identifier.epage	562	en