Morphological and mechanical analysis of natural marble joints submitted to shear tests

摘要: Abstract: In order to evaluate the influence of surface morphology on mechanical behavior twelve natural marble joints, very accurate topography measurements joint surfaces under constant normal load (CNL) conditions were performed before and after shear tests. The was carried out using a three-dimensional (3D) laser-scanning profilometer with parallel grid at regular interval 500 μm. Each shearing reconstructed by geostatistical methods according eight different directions. A quantitative description global directional statistical parameters. These parameters allow determine anisotropy divide joints into three groups similar given direction. sample same group is submitted stress but rates ranging from 5 20 μm/s. influences rate discontinuities investigated, as well its dilatancy behavior. data upper lower walls also permit quantify contact areas testing. After tests, sheared scanned again Based obtained shearing, damage zones that occurred during located for both each joint. characterizations contribute better understanding discontinuities.