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钱塘江河口沿江的水文、地质条件复杂,江边粉土基坑面临洪水、强潮威胁。在大量工程调研的基础上,选择钱塘江杭州段海塘和地质典型断面,对钱塘江高潮位及设计洪水位,分基坑离江距离、坑底加固、开挖深度、围护墙插入深度对江边冲海积粉土基坑性状的影响进行了数值研究。结果表明:江边粉土基坑在江水位作用下变形大;坑底加固对粉土基坑效果显著;江边粉土基坑围护结构底部区域的流速大、流网密集,应采取措施尽量降低基坑内外水头差,当止水帷幕漏水时,应有紧急应付漏水的对策。数值模拟结果为工程设计提供依据和参考。
The hydrological and geological conditions along the banks of the Qiantang River estuary are complex. The foundation pit on the river side faces floods and strong tides. Based on a large number of engineering investigations, the seawall and geological sections of Hangzhou section of Qiantang River are selected to analyze the Qiantang River high tide level and design flood level, sub-foundation pit and river distance, bottom reinforcement, excavation depth, Numerical simulation of the influence of the seafloor silty soil foundation pit on the waterfront is carried out. The results show that the foundation of the river side silt deforms greatly under the action of river water level. The reinforcement of the bottom of the pit has a significant effect on the silty foundation pit. The flow velocity at the bottom of the retaining structure of the river side silt pit is large and the flow network is dense. Minimize the pit inside and outside the pit difference, when the water curtain leakage, there should be emergency measures to deal with water leakage. Numerical simulation results provide the basis and references for engineering design.