Back analysis of banqiao clay core dam breaching

In this study, a numerical model is put forward to simulate the Banqiao reservoir dam breaching. Based on the breaching process records, a nmnerical model is put forward. In this model, two different erosion formulas are utilized to simulate the erosion process of dam shell and core materials, respectively; a mechanical equilibrium equation is adopted to simulate the shear failure of clay core; meanwhile, broad- crested weir formula is adopted to calculate breach flow discharge, the limit equilibrium method is tilized to analyze the stability of breach slope as well. In addition, according to the real situation, the model considers dam base erosion. Based on the surveyed records, the calculated results of the proposed model are in accordance with the measu.red data.

Keywords:

Banqiao reservoir , overtopping , clay core dam , numerical model