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钱塘江是举世闻名的强潮河口 ,涌潮最大高度 3m左右 ,流速 6～ 8m/s,实测最大涌潮压力为70kPa ,最大流速 12m/s,动力条件强劲 ,对海塘、丁坝等各种建筑物破坏力极大。以往钱塘江海塘基础防冲工程采用无围堰乘潮施工 ,海塘底脚须高于低水位以上 ,施工质量及施工进度均难以保证 ,由于塘脚前滩地冲淤变幅较大 ,当滩地刷低后 ,塘脚挂空 ,塘外坡土体在低潮位时渗透逸出坡降大 ,发生流土现象 ,塘脚乃至护坡发生坍塌 ,涌潮顶冲地段工程屡修屡毁。提出了一种在海塘堤脚外 2 0～ 10 0m的中低滩地上填筑土工布充填土管袋围堰结构 ,能有效地抵御强涌潮冲击 ,使塘脚基础可做到滩地最大冲刷深度以下 ,解决了塘脚偏高的老大难问题。
Qiantang River is the world-famous strong tidal estuary, the maximum tidal height of about 3m, the flow rate of 6 ~ 8m / s, the maximum measured tidal pressure of 70kPa, the maximum flow rate of 12m / s, strong dynamic conditions of the seawall, groin and other buildings Material destructive great. In the past Qiantang River seawall basic anti-flushing project using no cofferdam tidal wave construction, the bottom of the pond should be above the low water level, construction quality and construction progress are difficult to guarantee, as a result of Tangtu beach erosion and deposition greater amplitude, when the beach brush After the low, the pond foot hanging empty, pond soil outside the body at low tide bit when the infiltration escaped out of the slope, the phenomenon of flow of soil, pond foot and slope collapse, tidal top Chong red Lot repeatedly destroyed. A kind of construction method of earth cofferdam filled soil tube bag cofferdam filled on middle and low beach of 20 ~ 100 m away from the seawall embankment is proposed, which can effectively resist the impact of strong tidal surge and make the foundation of pond foot reach the maximum erosion depth The following, to solve the high stubborn pond feet problem.