Abstract
This paper presents a state-dependent constitutive model for gas hydrate-bearing sediments (GHBS), considering the cementing effect for simulating the stress–strain behavior of GHBS. In this work, to consider the influence of hydrate on matrix samples in theory, some representative GHBS laboratory tests were analyzed, and it was found that GHBS has obvious state-related characteristics. At the same time, it was found that GHBS has high bonding strength. In order to describe these characteristics of GHBS, the cementation strength related to hydrate saturation is introduced in the framework of a sand state correlation model. In addition, in order to accurately reflect the influence of cementation on the hardening law of GHBS, the degradation rate of cementation strength is introduced, and the mixed hardening theory is adopted to establish the constitutive model. The model presented in this paper reproduces the experimental results of Masui et al. and Miyazaki et al., and the prediction performance of the model is satisfactory, which proves the rationality of this work.
Highlights
With the continuous development and progress of exploration technology and equipment, the exploitation of oil and gas resources has gradually shifted from land and shallow sea to deep sea [1]
Some countries have carried out on-site exploitation of hydrate, and Mallik in Canada was the first place to carry out gas hydrate test mining [4]
Gas hydrate test mining was carried out three times, in 1998, 2002, and 2007–2008, respectively, and the production response characteristics of gas hydrate-bearing sediments (GHBS) were directly identified for the first time
Summary
With the continuous development and progress of exploration technology and equipment, the exploitation of oil and gas resources has gradually shifted from land and shallow sea to deep sea [1]. Studying and analyzing the strength and deformation of GHBS, and expressing their mechanism and general rules in an appropriate constitutive model for application to theoretical analysis and for handling practical engineering problems, have gained importance in the task of guaranteeing the safe exploitation of hydrates. Combined with the mechanical properties of GHBS, which are similar to sand or special soil, based on different model frameworks, several types of constitutional models have been proposed. In this study, combined with the state-related characteristics of GHBS, under the framework of the state-related model of sand, the cementation strength of GHBS is introduced, the evolution law of cementation strength is established, and the state-related constitutive model of GHBS is established by adopting the mixed hardening theory
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