Meikuang Anquan (Jun 2022)
Study on strength criterion of gas hydrate-coal mixture based on Drucker - Prager criterion
Abstract
In order to obtain the applicability of the strength criterion of gas hydrate coal under high saturation, based on Drucker-Prager criterion and combined with the stress-strain curve of gas hydrate coal under conventional triaxial compression, the error between the theoretical value and the experimental value under Drucker-Prager criterion was discussed. The applicability of Drucker-Prager criterion was analyzed and compared with Mohr-Coulomb criterion. The results show that the peak strength of gas hydrate coal increases with the increase of confining pressure and saturation under the coupling effect of high saturation and confining pressure. The maximum absolute errors of strength prediction by Mohr-Coulomb criterion and Drucker-Prager criterion were 6.77% and 3.66%, respectively, indicating that the test results were in good agreement with the prediction model. However, the absolute errors of intensity prediction of Drucker-Prager criterion are in the range of 0.92%-3.66%, and the range of error fluctuation is small, indicating that Drucker-Prager criterion is more suitable for high saturation.
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