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Modification of poroelastic properties in granite by heating - cooling treatment
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  • Jianfu Shao,
  • Fan Zhang,
  • Yuhao Zhang,
  • Dawei Hu
Jianfu Shao
University of Lille

Corresponding Author:jian-fu.shao@polytech-lille.fr

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Fan Zhang
Hubei University of Technology
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Yuhao Zhang
University of Lille
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Dawei Hu
Institution of Rock and Soil Mechanics, Chinese Academy of Sciences
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Abstract

Poroelastic properties play an essential role in interaction between deformation and fluid pressure change in porous materials. These properties are inherently related to microstructural evolutions such as porosity change and micro-cracks growth. In this study, the evolutions of poroelastic properties of a hard rock (granite) are investigated in terms of thermal micro-cracking process. Granite samples are first subjected to a heating-cooling treatment with different values of temperature. The evolutions of poroelastic properties (bulk modulus of porous skeleton, compressibility modulus of solid matrix, Biot’s coefficient) of treated samples are analyzed in terms of micro-cracks induced by the heating-cooling treatment. It is found that both connected and occluded micro-cracks are generated in granite samples. The bulk modulus of porous skeleton is affected by the connected micro-cracks while the compressibility modulus of solid matrix is influenced by the occluded micro-cracks. Biot’s coefficient is affected by the connectivity of micro-cracks.