Experimental study of failure behavior of disturbed zone around an opening in non-persistent jointed rock masses

2003-2004 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Crack propagation in brittle solid containing 3D surface fracture under uniaxial compression

2003-2004 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Experimental and theoretical analyses of three-dimensional surface crack propagation

2011-2012 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Geomechanical model testing of surface rupture and bridge damage produced by discontinuous reverse faults

2009-2010 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Dynamic breakage and fragmentation of brittle single particle of various sizes and strength

2003-2004 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

A Criterion for Brittle Failure of Rocks Using the Theory of Critical Distances

This paper presents a new analytical criterion for brittle failure of rocks and heavily overconsolidated soils. Griffith’s model of a randomly oriented defect under a biaxial stress state is used to keep the criterion simple. The Griffith’s criterion is improved because the maximum tensile strength is not evaluated at the boundary of the defect but at a certain distance from the boundary, known as the critical distance. This fracture criterion is known as the Point Method, and is part of the Theory of Critical Distances, which is utilized in fracture mechanics. The proposed failure criterion has two parameters: the inherent tensile strength, ó0, and the ratio of the half-length of the initial crack/flaw to the critical distance, a/L. These parameters are difficult to measure but they may be correlated with the uniaxial compressive and tensile strengths, óc and ót. The proposed criterion is able to reproduce the common range of strength ratios for rocks and heavily overconsolidated soils (óc/ót=3-50) and the influence of several microstructural rock properties, such as texture and porosity. Good agreement with laboratory tests reported in the literature is found for tensile and low confining stresses.The work presented was initiated during a research project on “Structural integrity assessments of notch-type defects", for the Spanish Ministry of Science and Innovation (Ref.: MAT2010-15721)

Rockfall problems in Hong Kong and some new experimental results for coefficients of restitution

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