Acta Mechanica Solida Sinica

, Volume 25, Issue 4, pp 361–376 | Cite as

A Hydro-Mechanical-Chemical Coupling Model for Geomaterial with Both Mechanical and Chemical Damages Considered

  • Dawei Hu
  • Hui Zhou
  • Qizhi Hu
  • Jianfu Shao
  • Xiating Feng
  • Haibin Xiao
Article

Abstract

A general framework of hydro-mechanical-chemical coupling model is proposed for geomaterial subjected to the dual effects of mechanical loading and chemical degradation. Mechanical damage due to microcracks in solid matrix and chemical damage induced by the increase of porosity due to dissolution of matrix minerals as well as their interactions are considered. A special model is proposed for sandstone. The reaction rate is formulated within the framework of mineral reaction kinetics and can thus take into account different dissolution mechanisms of three main mineral compositions under different pH values. The increase of porosity is physically defined by the dissolution of mineral composition and the chemical damage is related to the increase of porosity. The mechanical behavior is characterized by unified plastic damage and viscoplastic damage modeling. The effective stress is used for describing the effect of pore pressure. The elastic parameters and plastic evolution as well as viscoplastic evolution are dependent on chemical damage. The advection, which is coupled with mechanical damage and chemical damage, is considered as the dominant mechanism of mass transfer. The application of model proposed is from decoupled experiments to fully coupled experiment. The model offers a convenient approach to describing the hydro-mechanical-chemical coupled behavior of geomaterial.

Key words

hydro-mechanical-chemical coupling mechanical damage chemical damage sandstone chemical kinetics 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics and Technology 2012

Authors and Affiliations

  • Dawei Hu
    • 1
    • 2
  • Hui Zhou
    • 1
  • Qizhi Hu
    • 1
    • 3
  • Jianfu Shao
    • 2
  • Xiating Feng
    • 1
  • Haibin Xiao
    • 4
  1. 1.State Key Laboratory of Geomechanics and Geotechnical EngineeringInstitute of Rock and Soil Mechanics, Chinese Academy of SciencesWuhanChina
  2. 2.LML, UMR8107, CNRSUniversity of Lille IVilleneuve d’AscqFrance
  3. 3.School of Civil Engineering and ArchitectureHubei University of TechnologyWuhanChina
  4. 4.Lancang River Hydropower Co., LtdKunmingChina

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