A Mechanical Constitutive Model for Hydrate-Bearing Sediments and Calculation of Material Parameters With the Discrete Element Method

ZHOU Bo; WANG Hongqian; WANG Hui; XUE Shifeng

doi:10.21656/1000-0887.390284

Volume 40 Issue 4

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Article Navigation > Applied Mathematics and Mechanics > 2019 > 40(4): 375-385

ZHOU Bo, WANG Hongqian, WANG Hui, XUE Shifeng. A Mechanical Constitutive Model for Hydrate-Bearing Sediments and Calculation of Material Parameters With the Discrete Element Method[J]. Applied Mathematics and Mechanics, 2019, 40(4): 375-385. doi: 10.21656/1000-0887.390284

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A Mechanical Constitutive Model for Hydrate-Bearing Sediments and Calculation of Material Parameters With the Discrete Element Method

doi: 10.21656/1000-0887.390284

College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, P.R.China

Funds: The National Key R&D Program of China（2017YFC0307604）

Received Date: 2018-11-12
Rev Recd Date: 2018-11-21
Publish Date: 2019-04-01

Abstract

Abstract

To soundly describe the mechanical behaviors of hydrate-bearing sediments in the cases of different saturation levels of hydrate and various confining pressures, the stress-strain relation equations and elastic modulus weak-form equations for hydrate-bearing sediments were developed based on the generalized Hooke’s law. The softening coefficient and softening exponent of the hydrate-bearing sediments were determined according to the triaxial compression test results. A discrete element method (DEM) to calculate the initial elastic moduli of hydrate-bearing sediments was proposed based on the 3D particle flow code (PFC^3D). The mechanical behaviors of hydrate-bearing sediments under 6 various conditions related to saturation levels of hydrate and confining pressures, were numerically simulated with the stress-strain relation equations, elastic modulus softening equations and the DEM together. Numerical results show that， the proposed stress-strain relation equations, elastic modulus softening equations and the DEM can effectively predict the mechanical behaviors of hydrate-bearing sediments under various saturation levels of hydrate and confining pressures. The work gives a theoretical basis and a computational method for the investigations on the mechanical behaviors of hydrate boreholes and the safe exploitation of hydrate.
- hydrate-bearing sediments,
- mechanical constitutive model,
- saturation level of hydrate,
- confining pressure,
- discrete element method

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References(21)

References

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