摘要：The effect of ISO 834 fire on the mechanical properties of granite rock specimen submitted to uniaxialloading is numerically investigated. Based on Newton＇s second law, the rate-equation model of graniterock specimen under mechanical load and fire is established. The effect of heat treatment on the mechanicalperformance of granite is analyzed at the center and the ends of specimen. At the free end ofgranite rock specimen, it is shown that from 20
C to 500
C, the internal stress and internal strain areweak; whereas above 500
C, they start to increase rapidly, announcing the imminent collapse. At thecenter of specimen, the analysis of the internal stress and internal strain reveals that the fire reduces themechanical performance of granite significantly. Moreover, it is found that after 3 min of exposure to fire,the mechanical energy necessary to fragment the granite can be reduced up to 80%. 2015 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting byElsevier B.V. All rights reserved.

关键词：granite rock specimen high temperature 

单位：Laboratory of Sciences Material Department of Physics Faculty of Science University of Yaoundé Yaoundé Cameroon Department of Mine Mineral Processing and Environment School of Geology and Mining Engineering University of Ngaoundéré Meiganga Cameroon Douala Institute of Technology Douala Cameroon