Abstract
The secondary consolidation rate of compacted clay and rockfills has been proven to be relatively close, however, only the rheological property of the rockfill is considered in commonly used finite element analysis of core-wall dams. Therefore, the rheological property of the compacted clay and its influence on the stress and deformation of the Core-wall dam is discussed in this paper. The coefficient of secondary consolidation of unsaturated clay is significantly larger than that of saturated clay, and when the clay is saturated, the coefficient of secondary consolidation increases with the increasing loading. Both the unidirectional compression and triaxial compression rheological tests can be used to determine the rheological parameters and the results are relatively close. The finite element analysis indicates that the rheological deformation of clay core-wall has a considerable influence on the stress and deformation of the dam, e.g., causing higher stress levels and larger settlement especially around the core-wall. Hence, the rheological property of clay core-wall cannot be ignored in finite element analysis.
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