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 numerical 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, broadcrested weir formula is adopted to calculate breach flow discharge, the limit equilibrium method is utilized 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 measured data.