ON THE FLOW FIELD AND STRUCTURAL STABILITY FOR CONSOLIDATION WORKS WITH A HYDRAULIC DROP

Abstract

For the purpose of evaluation of the flow filed and the stability of the groundsill, numerical simulations were performed for fixed bed hydraulic model experiments of river groundsills with a hydraulic drop. The numerical results are in good agreement with experimental data. With analyzing the numerical results, it is shown that the groundsill blocks are swept out due to hydrodynamic forces acting on the blocks, which are observed in 2D and 3D movable bed hydraulic model experiments. The computations also show that pore water pressure decreases with increasing permeability of materials under the structure, increases significantly with one-piece structure groundsill. With the result of numerical experiments, it is clear that sealing works installed at front under groundsill may contribute to dynamic stability in terms of flow forces, but sealing works installed at the end may benefit countermeasure against piping.