In order to clarify the influences of different conditions on the seawall seepage deformation and to formulate rational and effective impervious reinforcement scenario, combined with the problems encountered in the impervious reinforcement of Qiantang River seawall, this work applied the saturated-unsaturated and unsteady seepage flow analysis program considering the soil permeability variation with seepage deformation propagation to analyze the effects of the initial phreatic line, initial water content of soil, rainfall and flood characteristics on the seawall seepage deformation. The analysis results show that the initial phreatic line plays a constraint role to the seawall seepage deformation; the increase of initial soil saturation will shorten the penetration time required for back slope; under the flood with rain, the phreatic line of seawall will rise up fast and can produce large seepage gradient of back slope; the closer rainfall will produce the larger influence; the water level and waveform of flood are also have great influence on the penetration process of seawall.%为了明确各种条件对海塘塘身渗透变形的影响,以制订合理有效的防渗加固方案,结合钱塘江海塘塘身防渗加固中遇到的问题,应用能够考虑渗透变形后土体渗透性变化的饱和-非饱和/非稳定渗流分析程序进行了塘身初始浸润线、塘身土体初始含水量、降雨及洪水特性等因素的影响分析.结果表明:初始浸润线对塘身是否发生渗透变形起一定的制约作用;土体初始饱和度的增加可缩短洪水渗透至背坡所需时间;伴随降雨的洪水,浸润线上升较快,塘身背坡可产生较大的出逸坡降,离洪水越近的降雨,所发生的影响越大;洪水水位和洪水波形对塘身渗透过程也有较大的影响.该研究为海塘工程建设、防渗加固和运行管理等提供了科学依据.
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