A true triaxial creep constitutive model of rock considering the coupled thermo-mechanical damage

Tong, Huidong; Chen, Youliang; Chen, Qijian; Du, Xi; Xiao, Peng; Wang, Suran; Dong, Yang; Pan, Yungui; Ma, Hao; Long, Zhiyu

doi:10.1016/j.energy.2023.129397

Cited by 4 publications

(1 citation statement)

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“…The wetland structure in the gas hydrate-rich region of the Tibetan Plateau has also been anthropogenically damaged by the gas hydrate exploration activities that have recently taken place in China’s onshore area [ 6 , 7 , 8 , 9 ]. The microstructure and elastic properties of the rocks [ 10 , 11 , 12 , 13 , 14 ] in sedimentary strata are altered by the presence of gas hydrates. Natural gas hydrates decompose during extraction, weakening the mechanical qualities of the strata that contain them.…”

Section: Introductionmentioning

confidence: 99%

A State-Dependent Elasto-Plastic Model for Hydrate-Bearing Cemented Sand Considering Damage and Cementation Effects

Tong,

Chen,

et al. 2024

Materials

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In order to optimize the efficiency and safety of gas hydrate extraction, it is essential to develop a credible constitutive model for sands containing hydrates. A model incorporating both cementation and damage was constructed to describe the behavior of hydrate-bearing cemented sand. This model is based on the critical state theory and builds upon previous studies. The damage factor Ds is incorporated to consider soil degradation and the reduction in hydrate cementation, as described by plastic shear strain. A computer program was developed to simulate the mechanisms of cementation and damage evolution, as well as the stress-strain curves of hydrate-bearing cemented sand. The results indicate that the model replicates the mechanical behavior of soil cementation and soil deterioration caused by impairment well. By comparing the theoretical curves with the experimental data, the compliance of the model was calculated to be more than 90 percent. The new state-dependent elasto-plastic constitutive model based on cementation and damage of hydrate-bearing cemented sand could provide vital guidance for the construction of deep-buried tunnels, extraction of hydrocarbon compounds, and development of resources.

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