An Equivalent Damage Model of Concrete Cut-Off Wall Based on Homogenization of Peridynamics

Abstract:

The concrete cut-off wall has been widely used in high embankment dams constructed in the overburden in China. The local failure of the wall embedded in the soil may occur since it is subjected to the giant water pressure， earth pressure， and the uneven settlement between the soil and the concrete. Generally， discrepancies of structure dimensions across diverse scales and accurate descriptions of the complicated failure involved in this process are crucial but difficult to be considered. In this paper， based on the multi-scale homogenization method of peridynamics， an equivalent damage model of concrete cut-off wall in high embankment dams was proposed. The concept of the model was given， and based on the damage mechanism of the cut-off wall， the aforementioned equivalent damage model was established. This model is characterized by its simplified formula， few parameters with valid physical meanings， and unified expressions of the tension and compression damage. The new index number renders the model to be capable of more accurately simulating the damage evolution process of concrete. The model proposed is easy to be employed in engineering practices. After the validation of the model proposed through concrete material tests and an eccentric three-point bending concrete beam test， it was employed to analyze the failure of the cut-off wall in a high gravel earth core rockfill dam in 3D.

Key words:concrete cut-off wall;peridynamics;homogenization multiscale method;equivalent damage model