论文部分内容阅读
在天津滨海饱和重塑软粘土不排水循环三轴试验的基础上,分析了不同静、动应力组合影响下软粘土的累积变形规律。基于静蠕变理论,提出一种长期循环荷载作用下饱和软粘土轴向循环累积塑性应变经验模型,其中,用双曲线函数来表示软粘土轴向累积应变与循环次数的关系,用指数函数来表示累积应变与相对偏应力水平的关系。以有限元软件ABAQUS为平台进行二次开发,通过用户子程序CREEP将该模型嵌入有限元数值模型中,并利用室内三轴不排水循环蠕变的试验结果对本文经验模型的数值计算结果进行验证。最后,将该数值计算模型应用到防波堤工程实例中,分析了软土地基的循环累积变形的变化规律。研究成果可为软粘土地基上港口与海岸水工建筑物的设计提供参考。
Based on the undrained cyclic triaxial tests of Tianjin coastal saturated remodeled soft clay, the cumulative deformation of soft clay under different static and dynamic stress combinations was analyzed. Based on the theory of static creep, an empirical model of cyclic cyclic cumulative plastic strain of saturated soft clay under long-term cyclic loading is proposed. The hyperbolic function is used to represent the relationship between cumulative axial strain and cyclic strain of soft clay. The relationship between cumulative strain and relative stress level is shown. The finite element software ABAQUS is used as the platform for secondary development. The user subroutine CREEP is used to embed the model in the finite element numerical model. The numerical results of the empirical model in this paper are validated by the test results of indoor three-axis undrained cyclic creep . Finally, the numerical calculation model is applied to breakwater engineering examples, and the variation regularity of cumulative cyclic deformation of soft ground is analyzed. The research results can provide references for the design of hydraulic structures on the soft clay foundation harbors and coasts.