水合物加热开采时土体变形数值分析

天然气水合物是未来的一种新型能源,但水合物的分解可能使地表产生较大的变形,从而影响到开采平台及地面建筑的稳定性,甚至带来环境灾害.基此,文章利用有限元法对水合物的加热开采过程进行了热力耦合分析,得到了水合物开采过程中土体的变形规律.计算结果表明：水合物加热开采时,土体变形量随着分解半径的增大而非线性增加;当水合物分解半径为40m时,地表最大沉降迭0.38m,最大水平位移为0.12m.

Numerical analysis of soil deformation in the process of gas hydrate decomposed by heating

Gas hydrate is a new source of energy that may be utilized in the future. The dissociation of gas hydrate would result in the deformation or the collapse of the ground surface, affecting the stability of excavation platform and buildings, or even causing environmental accidents. A thermalstress coupling analysis of the soil deformation was conducted via the finite element method. The deformation and failure laws of soil were obtained in the process of gas hydrate dissociation. The vertical and horizontal displacements of soil increase nonlinearly with the increasing of decomposition radius while the gas hydrates are decomposed by heating. When the decomposition radius reaches 40m, the maximum surrounding ground settlement amounts to 0.38m and the maximum surrounding ground horizontal displacement totals 0. 12 m.