The tensile mechanical behavior of granite containing pre-existing holes after high temperature treatment
HUANG YanHua
YANG ShengQi
Abstract：To investigate the influence of high temperature on the physical and mechanical properties of rock,a series of Brazilian tests was carried out on granite specimens which were treated from 25℃ to 900℃.The physical characteristics (colour,volume,mass and density,the mechanical properties,e.g.),load-displacement curve,tensile strength and stiffness,and the crack evolution process of granite specimens were analyzed.Compared to the specimens at room temperature,after high temperature,the volume of them increases,while the mass and density decreases.As the temperature increases,the brittleness of granite weakens,and the ductility enhances.The tensile strength first increases and then decreases with the increasing temperature.Moreover,the strengths of pre-holed specimens are lower than that of intact specimen,and the reducing extent is dependent on the bridge angle.The granite specimens containing three horizontal and diagonal holes show splitting failure,which is induced by the propagation of crack from the central hole.However,the granite specimen containing three vertical holes fails due to the coalescence of cracks from the three pre-existing holes.
Keywords：rock mechanicsgranitehigh temperaturetensile strengthcrack propagation
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 783-791 )