A two-dimensional thermal-hydro-mechanical bond contact model for methane hydrate bearing soils

JIANG Ming-jing; ZHU Fang-yuan

doi:10.11779/CJGE201408001

Volume 36 Issue 8

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Chinese Journal of Geotechnical Engineering > 2014 > 36(8): 1377-1386. > DOI: 10.11779/CJGE201408001

JIANG Ming-jing, ZHU Fang-yuan. A two-dimensional thermal-hydro-mechanical bond contact model for methane hydrate bearing soils[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(8): 1377-1386. DOI: 10.11779/CJGE201408001

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A two-dimensional thermal-hydro-mechanical bond contact model for methane hydrate bearing soils

JIANG Ming-jing^{1, 2},
ZHU Fang-yuan^{1, 2}

1. Dept. of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical & Underground Engineering, Ministry of Education, Shanghai 200092, China

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Received Date: July 23, 2013
Published Date: August 18, 2014

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Abstract

Abstract

The strength and deformation of methane hydrate bearing soils are influenced by their inter-particle cemented hydrate, the extent of which depends on the surrounding temperature, pore-water pressure and mechanical environment. It is aimed to establish a thermal-hydro-mechanical bond contact model for methane hydrate bearing soils. Firstly, contact force-displacement laws and bond failure criteria are presented according to two types of bond modes that methane hydrate may present. Secondly, the strength and stiffness of inter-particle cemented hydrate are studied with respect to the parameter L which identifies the minimum distance from a point to the phase equilibrium line in the coordinate system with ordinate being dimensionless pore-water pressure and abscissa being dimensionless temperature. Finally, the size of cemented hydrate is calculated corresponding to the methane hydrate saturation. The proposed bond contact model can be easily implemented into the distinct element method (DEM), providing an efficient tool for investigating the macro- and micro-mechanical behaviors of methane hydrate bearing soils.
- methane hydrate bearing soil,
- methane hydrate,
- temperature and water pressure,
- bond contact model

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A two-dimensional thermal-hydro-mechanical bond contact model for methane hydrate bearing soils

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