Journal
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
Volume 26, Issue 2, Pages 319-325Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijmst.2015.12.019
Keywords
High temperature; Sandstone containing fissure; Strength characteristics; Deformation characteristics; Evolution law
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In order to investigate the physical and mechanical properties of sandstone containing fissures after exposure to high temperatures, fissures with different angles alpha were prefabricated in the plate sandstone samples, and the processed samples were then heated at 5 different temperatures. Indoor uniaxial compression was conducted to analyze the change rules of physical properties of sandstone after exposure to high temperature, and the deformation, strength and failure characteristics of sandstone containing fissures. The results show that, with increasing temperature, the volume of sandstone increases gradually while the quality and density decrease gradually, and the color of sandstone remains basically unchanged while the brightness increases markedly when the temperature is higher than 585 degrees C; the peak strength of sandstone containing fissures first decreases then increases when the temperature is between 25 degrees C and 400 degrees C. The peak strain of sandstone containing fissures increases gradually while the average modulus decreases gradually with increasing temperature, and the mechanical properties of sandstone show obvious deterioration after 400 degrees C. The peak strain of sandstone containing fissures increases gradually while the average modulus decreases gradually with increasing temperature; with increasing angle a of the fissure, the evolution characteristics of the macro-mechanical parameters of sandstone are closely related to the their own mechanical properties. When the temperature is 800 degrees C, the correlation between the peak strength and average modulus of sandstone and the angle a of the fissure is obviously weakened. The failure modes of sandstone containing fissures after high temperature exposure are of three different kinds including: tensile crack failure, tensile and shear cracks mixed failure, and shear crack failure. Tensile and shear crack mixed failure occur mainly at low temperatures and small angles; tensile crack failure occurs at high temperatures and large angles. (C) 2016 Published by Elsevier B.V. on behalf of China University of Mining & Technology.
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