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

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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.

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Authors and Affiliations

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

    Dawei Hu, Hui Zhou, Qizhi Hu & Xiating Feng

  2. LML, UMR8107, CNRS, University of Lille I, Villeneuve d’Ascq, France

    Dawei Hu & Jianfu Shao

  3. School of Civil Engineering and Architecture, Hubei University of Technology, Wuhan, 430068, China

    Qizhi Hu

  4. Lancang River Hydropower Co., Ltd, Kunming, 650214, China

    Haibin Xiao

Authors
  1. Dawei Hu
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  2. Hui Zhou
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  3. Qizhi Hu
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  4. Jianfu Shao
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  5. Xiating Feng
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  6. Haibin Xiao
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Corresponding author

Correspondence to Hui Zhou.

Additional information

Project supported by the National Natural Science Foundation of China (Nos. 51009132, 50920105908, 50979104 and 10972221) and the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences (No. Z011006).

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Hu, D., Zhou, H., Hu, Q. et al. A Hydro-Mechanical-Chemical Coupling Model for Geomaterial with Both Mechanical and Chemical Damages Considered. Acta Mech. Solida Sin. 25, 361–376 (2012). https://doi.org/10.1016/S0894-9166(12)60033-0

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  • DOI: https://doi.org/10.1016/S0894-9166(12)60033-0

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