Mechanical Properties of Methane Hydrate-Bearing Interlayered Sediments

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.