Influence of Natural Gas Hydrate’s Property Weakening from Dissociation on Subsidence of Seabed Sediments: A Simulation Study

Table 1

Physical and mechanical parameters of soil.

Soil layers		Sediment type	Density (kg m^−3)	Young’s modulus (MPa)	Poisson’s ratio	Cohesion (kPa)	Friction angle (°)
Overlying layer		Clayey silt	1960	27	0.36	15	9.3
HBS	Zero dissociation	Clayey silt	1972	96	0.32	158	10
	30% dissociation		1968	76	0.33	108	9.8
	60% dissociation		1966	56	0.34	67	9.6
	80% dissociation		1964	38	0.35	32	9.4
	100% dissociation		1962	20	0.36	5	9.0
Lower layer		Clayey silt	1970	38	0.35	32	11.6