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深海沉积物剪切变形过程模拟方法是深海资源采运设备设计的重要依据。从探讨深海沉积物土工力学特性及其剪切变形过程的特点出发,首先,从深海沉积物土体单元微观受力分析入手,建立出深海沉积物剪切变形损伤模型;其次,引进统计损伤理论,在深入研究深海沉积物微元强度度量方法的基础上,假定微元屈服或破坏服从Weibull随机分布,建立出深海沉积物剪切变形过程的统计损伤演化模型;然后,利用建立的深海沉积物损伤模型和统计损伤演化模型,建立了模拟深海沉积物剪切变形过程的剪切变形损伤统计本构模型。该模型可较好地反映深海沉积物剪切应变软化特征,同时可反映其剪切变形过程中剪切面法向正应力的影响;最后,通过试验曲线和模型曲线以及现有同类模型曲线的对比分析,验证了该模型的合理性与可行性。
Deep sea sediment shear deformation process simulation method is an important basis for deep sea resource acquisition and transportation equipment design. Starting from the characteristics of deep-sea sediment geomechanics and its shear deformation process, firstly, starting from the microscopic mechanical analysis of deep-sea sediments, the model of shear deformation of deep-sea sediments is established. Secondly, the statistical damage theory Based on the in-depth study of the strength measurement of micro-elements in deep-sea sediments, assuming that the yielding or failure of micro-elements obeys Weibull’s random distribution, a statistical damage evolution model of deep-sea sediment shear deformation is established. Then, Damage model and statistical damage evolution model, a statistical constitutive model of shear deformation damage was established to simulate the shear deformation process of deep sea sediments. The model can well reflect the shear strain softening characteristics of deep-sea sediments, and at the same time, it can reflect the influence of shear normal stress on the shear deformation in the deep sea sediment. Finally, by the experimental curves and model curves and the curves of the existing similar models The comparative analysis shows that the model is reasonable and feasible.