Mechanical Properties of Methane Hydrate-Bearing Interlayered Sediments
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The complex distribution of gas hydrate in sediments makes understanding the mechanical properties of hydrate-bearing sediments a challenging task. The mechanical behaviors of hydrate-bearing interlayered sediments are still poorly known. A series of triaxial shearing tests were conducted to investigate the strength parameters and deformation properties of methane hydrate-bearing interlayered sediments at the effective pressure of 1 MPa. The results indicate that the stress-strain curves of hydrate-bearing interlayered sediments are significantly different from that of hydrate-bearing sediments. The peak strength, Young’s modulus, initial yielding modulus, and failure mode are deeply affected by the methane hydrate distribution. The failure behaviors and mechanism of strain softening and hardening patterns of the interlayered specimens are more complicated than those of the integrated specimens. This study compares the different mechanical behaviors between integrated and interlayered specimens containing gas hydrate, which can serve as a reference for the prediction and analysis of the deformation behaviors of natural gas hydrate reservoirs.
Key wordsgas hydrate interlayered sediments mechanical property triaxial shearing tests strength parameters
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This research was supported by the National Natural Science Foundation of China (No. 41976074), National Key Research and Development Plan (No. 2017YFC030 7600), the Taishan Scholar Special Experts Project (No. ts201712079), Qingdao National Laboratory for Marine Science and Technology (No. QNLM2016ORP0207), and the Graduate School Innovation Program of China University of Petroleum (East China) (No. YCX2019020). These financial supports are gratefully acknowledged.
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