Analysis of overall seismic stability of sluice gates under strong earthquakes

Abstract

The dynamic stability analysis of sluice gates in high seismic intensity areas is an important issue in dam design. Relying on a sluice gate project in a strong earthquake area, a three-dimensional finite element model of the sluice gate-reservoir water-foundation system was established. The model considered the radiation damping effect of infinite foundation, the nonlinearity of foundation rock and soil materials, and the dynamic contact nonlinearity between the sluice gate and the foundation. The finite element time history analysis method was used to conduct a nonlinear seismic response analysis of the sluice gate. The criteria for overall structural instability were the sudden change in overall displacement of the sluice gate, the penetration of the sliding zone at the interface between the sluice gate and the foundation, and the non-convergence of dynamic calculations. The overall stability of the sluice gate under strong earthquakes was evaluated. The result showed that under various seismic conditions, the overall deformation pattern of the sluice gate-foundation system was normal, the deformation values were controllable, the sluice gate did not undergo overall sliding along the interface between the structure and the foundation, and the overall stability of the sluice gate-foundation system could be guaranteed.

Keywords

sluice gate / finite element / time history analysis method / contact nonlinearity / dynamic anti-sliding stability