【摘要】 富水相环境和富气相环境下水合物的赋存模式不同,造成在两种环境下含水合物沉积物的力学特性不同。在富水相环境下,随着水合物饱和度的增大,水合物的赋存模式会由悬浮模式逐渐向持力模式转变。为了描述水合物赋存模式的转变对沉积物力学性质的影响,本文基于有效饱和度的概念,提出了有效饱和度新的计算公式。然后,根据有效饱和度得到有效孔隙比的计算式。接着,基于粘土和砂土统一的UH模型(CSUH模型),通过将有效孔隙比引入到状态参量和弹性模量中,建立了富水相环境下含水合物沉积物的弹塑性本构模型。最后,通过与富水相环境下含水合物沉积物的室内三轴试验数据进行比较验证了该模型的合理性。更多还原

【Abstract】 Hydrate occurring habit in water-rich phase environments is different from that in methane gas-rich phase environments, and thus the mechanical properties of hydrate-bearing sediments in these two environments are different. In water-rich phase environments, hydrate occurring habit gradually transforms from suspension mode to loading mode with hydrate saturation increasing. Firstly, in order to describe the influence of these transformations on the mechanical properties of hydrate-bearing sediments in water-rich phase environments, a new expression of effective saturation is proposed based on the concept of effective saturation. And then, the expression of effective void ratio is obtained according to the new expression of effective saturation. Secondly, on the basis of the unified constative model for clays and sands(CSUH model), an elastic-plastic constitutive model of hydrate sediments in water-rich phase environment is developed by introducing the effective void ratio into the state variable and elasticity modulus. Finally, the rationality of the model is verified by comparing with the triaxial test data of hydrate sediments in water-rich environments.更多还原