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研究目的:提出一个更优的描述黏土非线性蠕变的方法。创新要点:1.提出了一个修正的蠕变系数,该系数与土体的密度相关,物理意义明确;2.将修正的蠕变系数嵌入到新开发的一个黏塑性模型中,实现了基于ABAQUS的本构二次开发;3.为工程实例的计算提供更为有效的模型。研究方法:1.总结广泛的调查土体蠕变试验结果,提出修正的蠕变系数(图3);2.给出修正的蠕变系数表示方法以及力学特性(图4);3.将所提系数嵌入到有限元程序中,验证了其准确性(图5)。重要结论:1.修正的蠕变系数可以很好地描述软黏土蠕变系数随孔隙比变化的规律;2.通过工程案例证实了修正系数的优越性。
Research purposes: To propose a better method for describing the nonlinear creep of clay. Innovative points: 1. Proposed a revised creep coefficient, which is related to the density of the soil, the physical meaning of a clear; 2. Modified creep coefficient embedded in a newly developed viscoplastic model to achieve based on ABAQUS Constitutive secondary development; 3.Provide a more effective model for the calculation of engineering cases. Research methods: 1. To summarize a wide range of soil creep test results, the proposed creep coefficient (Figure 3); 2. Given a modified creep coefficient representation and mechanical properties (Figure 4); 3. Will be The lifting coefficient is embedded into the finite element program to verify its accuracy (Figure 5). Important conclusions: 1. The revised creep coefficient can well describe the law of the creep coefficient of soft clay with the change of void ratio. 2. The superiority of the correction coefficient is confirmed through the engineering case.