Study on The Foundation of Ancient Seawall in Qian Tang River

The ancient seawall is utilized for preventing flood and tide at the Qiantang Estuary more than two hundred years. The phenomenon of soil flowing have been found at the toe of part seawalls. It is so necessary to select the reasonable reinforcement and keep the ancient seawall style scheme to reinforcing the seepage in foundation for protecting the ancient seawall. In this paper, taking Zhejiang Haining some ancient seawall based on the experimental section. We have researched four foundation seepage reinforcement schemes by field testing. We comparised of these schemes by the finite element computation, field permeability testing, excavation testing, and monitoring the deformation during the construction period. We analyzed and summarized the advantages and disadvantages of each reinforcement scheme. We know that the scheme of rotating jet grouting at the toe in foundation by restructuring part of machinery is more suiter then others.The research results will have important reference value for selecting the reinforcement scheme when the next step of Qian Tang river riverside ancient seawall protection engineering come.