A semi-empirical creep model was proposed to study the long-term deformation of expanded polystyrene (EPS) composite soil, in which elastic deformation was expressed by two Kelvin models and one Hook spring connected in series, and plastic deformation was described by two empirical models. Based on user subroutines CREEP of finite element program ABAQUS,the proposed semi-empirical creep model was secondarily developed and was verified by triaxial undrained creep test. Results showed that the creep behavior of EPS composite soil could not be neglected and the secondarily developed semi-empirical creep model was more reasonable and effective in reflecting the creep behavior of EPS composite soil. The research provided a powerful finite element approach to the study the creep behavior of EPS composite soil in future.%为研究EPS颗粒轻质混合土在荷载作用下的长期变形性质,即蠕变性,建立EPS颗粒轻质混合土的半经验半理论蠕变模型,用2个开尔文模型和1个虎克弹簧串联表示弹性变形,用2个经验模型表示塑性变形.利用有限元软件ABAQUS的用户子程序CREEP将EPS颗粒轻质混合土的半经验半理论蠕变模型进行二次开发,并利用室内三轴不排水蠕变试验进行验证.结果表明:EPS颗粒轻质混合土的蠕变性不可忽略,二次开发的半经验半理论蠕变模型是合理有效的,能够比较好地反映EPS颗粒轻质混合土的蠕变变形性质,为后续的蠕变性研究提供了强大的有限元分析手段.
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