摘要
水合物开采安全性评价亟需合理的含水合物沉积物本构关系模型,而等效弹性模量的准确预测是建立合理本构关系模型的重要前提条件。本文基于复合材料经典的应力串联和应变并联模型提出了含水合物沉积物等效弹性模量的细观力学混合律模型,与三轴压缩试验结果对比验证了该模型的适用性。研究结果表明:等效弹性模量细观力学混合律模型的模型参数少,且物理意义明确,其预测结果与试验数据符合良好;含水合物沉积物的割线模量随水合物饱和度与有效围压的增加而变大。
Predicting the elastic modulus of hydrate-bearing sediment( HBS) lays a foundation for proposing constitutive models of HBS which is of great significance to the safety assessment of natural gas production / extraction from hydrates. In this work,a mixed model for the elastic modulus of HBS is presented based on the classical series and parallel models of composite material,and the applicability of the model is checked through the comparison between triaxial shear tests and theoretical results. It is shown that the mixed model has simple parameters of explicit physical meanings,and the reasonability and feasibility of the model are verified; the secant modulus of HBS increases with the presence of gas hydrates and increases with increasing the effective confining pressure.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第S2期425-428,442,共5页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(41376078)
关键词
含水合物沉积物
割线模量
混合律模型
水合物饱和度
有效围压
Hydrate-bearing sediments
secant modulus
mixed model
hydrate saturation
effective confining pressure
