Abstract:Based on the water level changes during the flood season in July 2024, the finite element software GeoStudio was used to analyze the stability and sensitivity of the upstream earth rock cofferdam of a bridge during the flood season of Danjiangkou. The higher the water level on the water-facing side during the flood season, the greater the safety factor of the cofferdam slope. An increase in rainfall intensity would lead to an increase in pore water pressure on the surface soil of the cofferdam, reducing its stability. The duration of rainfall would also affect the stability of the cofferdam, but the overall stability was greater than 1.15 and met the standard requirements. The upstream water level rose significantly during the rainstorm and the change rate was obvious, resulting in a sharp increase in the horizontal displacement of the earth rock cofferdam, but no obvious subsidence or cracking was found. After the upstream water level dropped in the later stage, the horizontal displacement of the cofferdam tended to stabilize without obvious sliding or cracking. And the cofferdam successfully passed the flood period.
