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钱塘江古海塘建于明清时期,是钱塘江河口地区防洪御潮的重要屏障。为避免强水动力荷载对古海塘塘基的淘蚀和对塘身稳定性的影响,于古海塘前趾外建有护坦结构。海宁段的护坦多为无相互粘结的靠砌条石结构。为考察该护坦结构的失效机制,采用了波流水槽模型试验。试验揭示,条石覆盖缺失处,护坦易受强涌潮的冲击破坏;临江侧护坦之下的土体易受退潮渗流和纵向水流的冲蚀,并会导致护坦下沉;护坦作为覆盖层可有效保护土体,并可防止土体的瞬时液化和残余液化。
Built in the Ming and Qing Dynasties, Qiantang River ancient sea ponds are an important barrier to flood control and tide in Qiantang estuary. In order to avoid the influence of strong hydrodynamic loads on the erosion of the ancient seawall ponds and the stability of the ponds, a shield structure was built on the anterior of the ancient seawalls. Haining section of the Condor multi-bonded without the stone by the stone structure. In order to investigate the failure mechanism of this retaining structure, a wave flume model test was used. The test reveals that the stakes cover the missing place and the retaining wall is easily damaged by the impact of strong tide. The soil under the retaining wall under the riverbed is easily eroded by the ebb tide and the longitudinal water flow, Tan as a cover layer can effectively protect the soil, and can prevent soil instantaneous liquefaction and residual liquefaction.