为揭示砂泥岩填料在不同配合比下的蠕变力学特性，开展不同配合比下的砂泥岩填料剪切蠕变试验。试验发现填料等时应力-应变曲线具有明显的非线性特征，由此定义反映不同配合比及载荷时间的黏弹性模量，以此描述填料黏弹性变形，建立非定常弹性体来描述瞬时弹性变形，引入SP元件构建表征黏塑性变形的非定常黏塑性体，得到不同配合比下的砂泥岩填料非线性蠕变力学模型。同时采用新建模型和基础模型模拟填料蠕 变试验数据，验证了新建模型的合理性和可行性。研究结论为码头砂泥岩混合填料地基长期稳定性评价提供参考。

To reveal the creep mechanical properties of sandstone and mudstone fillers under different mix proportions, shear creep tests were conducted on sandstone and mudstone fillers under different mix proportions. The experiment found that the stress-strain curve of the filling material exhibited obvious nonlinear characteristics. Therefore, a viscoelastic modulus reflecting different mix proportions and load times was defined to describe the viscoelastic deformation of the filling material. A unsteady elastic body was established to describe the instantaneous elastic deformation, and an SP element was introduced to construct a unsteady viscoplastic body to characterize the viscoplastic deformation. Thus, a nonlinear creep mechanical model of sandstone and mudstone filling material under different mix proportions was obtained. Simultaneously the new model and the basic model were used to simulate the creep test data of fillers, and verify that the new model is reasonable and feasible. The research conclusions provide a reference for the long-term stability evaluation of wharf sand-mudstone mixed filler foundation.