MECHANICAL PROPERTIES OF METHANE HYDRATE-BEARING SAND PREPARED BY FROST SEEDING METHOD
It is a prerequisite to study the mechanical properties of natural gas hydrate-bearing sediments to prepare uniform samples with typical characteristics in the laboratory.In this paper,the mechanical properties of hydrate-bearing sand(HBS)samples prepared by excess gas method and frost seeding method were compared by triaxial shear test of methane HBS,and the mechanism of the difference was analyzed.At the same time,the influence of hydrate saturation on the deformation and strength characteristics of HBS samples prepared by frost seed method was systematically studied.The results show that the strength of samples prepared by frost seeding method is higher than that prepared by excess gas method,primarily due to the relatively uneven distribution of hydrate in the HBS samples prepared by excess gas method.The strength and secant modulus of the samples prepared by frost seeding method increased with the increase of hydrate saturation,and the internal friction Angle of the samples was basically not affected by hydrate saturation,but the cohesion and hydrate saturation showed an obvious positive correlation trend.
natural gas hydratetriaxial testmechanical propertiesfrost seeding methodexcess gas method
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