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Method for quantification of wear of sheared joint walls based on surface morphology

Abstract : Roughness and wear evolution of three different joint wall surfaces were characterized using surface roughness and surface wear parameters. Parameters were defined by considering the two components of morphology: waviness ("primary" roughness) and surface roughness ("secondary" roughness). Two surface roughness parameters are proposed: joint interface (or single wall) specific surface roughness coefficient SRs (0 <= SRs <= 1) for quantifying the amount of "pure" roughness (or specific roughness), and degree of joint interface (or single wall) relative surface roughness DRr (0 <= DRr <= 0.5). Two further parameters are also proposed in order to quantify the wear of wall surface: joint interface (or single wall) surface wear coefficient Lambda(interface), and the degree of joint interface (or single wall) surface wear D-w(interface). The three test specimens were: man-made granite joints with hammered surfaces, man-made mortar joints with corrugated surfaces, and mortar joints prepared from natural rough and undulated schist joint replicas. Shearing under monotonic and cyclic shearing was performed using a computer-controlled bidirectional and biaxial shear apparatus. Joint surface data were measured using a noncontact laser sensor profilometer prior to and after each shear test. Calculation of specific surface roughness coefficient SRs, and degree of surface wear D-w, indicated that the hammered joint interface with predominant interlocking wears much more (>90%) than the corrugated (27%) and the rough and undulated (23%) joint interfaces having localized interlocking points. The proposed method was also successfully linked to the classical wear theory
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Submitted on : Friday, March 21, 2014 - 2:18:16 PM
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Tikou Belem, Mountaka Souley, Françoise Homand. Method for quantification of wear of sheared joint walls based on surface morphology. Rock Mechanics and Rock Engineering, 2009, 42 (6), pp.883-910. ⟨10.1007/s00603-008-0023-z⟩. ⟨ineris-00963198⟩



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