Triaxial Compression Test on Synthetic Core Sample with Simulated Hydrate-Bearing Sediments

Natural gas hydrate is a new energy of clean,efficient and large amount of resources.The researches on mechanical properties of hydrate-bearing sediments is closely connected with hydrate drilling,geological hazards and many other aspects.Therefore,the developments of gas hydrate need to know the mechanical properties of the gas hydrate.For this reasons,coated sand in the laboratory was sintered into the test specimen,and then synthetic hydrate-bearing sediments with different saturation were made as the in-situ hydrate.A series of triaxial shear tests were carried out on artificial hydrate bearing sediments with different hydrate saturation and confining pressure.The testing results showed that with the increasing of confining pressure and hydrate saturation,the compressive peak strength was enhanced,and the cohesion also increased,but internal frictional angle and Poisson ratio have no remarkable change.According to the experimental results and Morh-Coulomb Criterion,the semi-empirical mathematical model of the peak strength about different hydrate saturation and confining pressure was established,providing some supports for the selection of strength parameters of hydrate for deep-water hydrate drilling,and for the theoretical analysis and numerical simulation of laboratory experiments.