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中文摘要：
在XTR01型微机控制电液伺服试验机上对南水北调西线工程中的板岩进行不同围压与轴压下的三轴蠕变试验。蠕变过程中，随着轴压的不同，板岩产生衰减蠕变与稳态蠕变两种过程，可通过六元件的广义弹黏塑性模型进行较好的描述。该模型包括H体、Bingham体和VP体，由该模型建立本构方程，并用板岩的蠕变试验数据拟合出对应元件的参数。拟合效果与试验数据比较吻合。同时，对板岩蠕变过程中蠕变率的变化情况也进行相关的拟合，显示出板岩蠕变率逐步减小到稳态蠕变的过程，取得较好成果。这些对今后分析板岩的变形具有较好的指导意义。
英文摘要：
Triaxial creep experiments of slates under different confining and axial pressures are done through the XTR01 electric-fluid servo-compression machine, which are taken from the West Route of South-to-North Water Transfer Project. During the creep process, decay creep and steady creep appear under different axial pressures, which can be described through the viscoelasto-plastic model. The model comprises three parts： Newton＇s model, Bingham＇s model and viscoplastic model. The constitutive equation of the model is established and the characters are analyzed. The creep parameters are fitted through the experiment data. The creep rate of the slates are also fitted. The results show that the creep rate decreases gradually until it reaches the steady rate. All these results can be used to analyze the deformation of the slates later.
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