钱塘江古海塘塘基防渗加固现场试验研究

目前仍然坚守在防洪御潮第一线的钱塘江明清古海塘，由于年代久远，部分塘段的塘趾部位存在流土现象，因此，选用合理且不破坏古海塘风貌的塘基防渗加固方案来保护古海塘十分必要。以浙江海宁某明清古海塘试验段为依托，通过现场试验，对比研究了4种塘基防渗加固保护方案，通过有限元分析、现场渗透试验、加固后开挖检验、施工期对古海塘的影响监测等手段，分析总结了各加固方案的优缺点，得到了机械适当改制后的“塘趾旋喷注浆”方案为优选方案的结论，研究成果对下一步钱塘江临江古海塘保护工程的塘基防渗加固方案选取具有重要参考价值。

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 seawalJ style scheme to reinforcing the seepage in foundation for protecting the ancient sea- wall. 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.