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通过系列含水合物松散沉积物三轴试验,分析了沉积物应力—应变曲线基本变形规律,建立了用于描述轴向应变—体积应变、轴向应变—侧向应变关系的半经验模型,探讨了不同模型参数的敏感性及其物理意义。首次建立了三轴剪切破坏条件下含水合物松散沉积物发生应变软化、应变硬化2种破坏形式临界条件的判别方法。结果表明:建立的软化、硬化临界条件预测模型与试验结果吻合较好;在一定起始孔隙比条件下,含水合物沉积物破坏过程中的应变硬化、应变软化特性是由有效围压、水合物饱和度共同控制的;应变关系模型中不同的模型参数对曲线形态的影响机理不同,明确各模型参数的物理意义对于进一步认识应变关系曲线演化规律具有重要意义。
Based on the triaxial tests of loose hydrate sediments, the basic deformation rules of stress-strain curves of sediments were analyzed and a semi-empirical model for describing the relationship between axial strain-volume strain and axial strain-lateral strain was established. Sensitivity of different model parameters and its physical meaning. For the first time, two critical conditions of strain softening and strain hardening for the formation of loose hydrate-containing sediments under triaxial shear failure conditions were established. The results show that the predicting model of softening and hardening critical conditions is in good agreement with the experimental results. Under certain initial porosity ratio, the strain hardening and strain softening properties of the hydrate-bearing sediments during the destruction process are determined by effective confining pressure, hydration Material saturation and common control. The different mechanism of the influence of different model parameters on the shape of the strain in the strain relation model is different. It is of great significance to clarify the physical meaning of each model parameter to further understand the evolution law of the strain relation curve.