Nghiên cứu ảnh hưởng của hệ cọc bê tông cốt thép đến gradient thấm tại cửa ra của cống qua đê xây dựng trên nền cát

Abstract

Many under-dike culverts in the Red River Delta have been built on seepage sensitivity sandy foundations. In these culverts, the steel sheet piles are used below bottom slab to reduce seepage gradient at the outlet and used reinforced concrete (RC) piles to increase bearing capacity of sandy foundations. Although they have been designed to ensure seepage safety according to the regulations, but in reality, the majority of seepage problems still occured in culverts with RC piles. This raises the need to evaluate the impact of RC piles on the permeability characteristics in the sandy foundations, especially the seepage gradient at the outlet. This article presents research results on the influence of RC piles on the seepage gradient in the outlet area by numerical and physical models. On that basis, propose a method to calculate the seepage gradient for under-dike culverts on the sandy foundations with RC piles in the Red River Delta