高面板堆石坝施工期防洪度汛的渗流问题研究

高面板堆石坝工程时常面临施工期挡水度汛的情形, 针对度汛期渗控体系不完善的渗流问题, 依托某高面 板堆石坝工程, 考虑坝体填筑、 防渗体系以及基岩分布等因素, 建立三维有限元计算模型, 并采用改进结点虚流 量法进行渗流场仿真计算, 得到不同度汛方案下坝体渗流场的水头分布、 浸润线和渗透坡降, 系统分析了施工期 挡水度汛情形的渗流场规律和特点。结果表明, 若坝体防渗体系不完整, 施工期坝体会引起显著的渗流问题, 易产生第二渗控线发生渗透破坏的危害, 应确保坝体挡水时渗控体系的有效性, 并严格控制第二渗控线的施 工质量。

Study on seepage problem of high CFRD in construction during flood period

One situation is considered in seepage control sy stem incomplete of hig h concrete faced rock2fill dam( CFRD): water retaining during construction of flood. According to seepage problem of the situation and based on a high CFRD project, the 3D FEM model was built in view of the factors of dam filling, seepage control system, defect locations and bedrock distribution. T he 3D seepage characteristics of dam were simulated and analyzed by using improved node virtual flow method, and the water head distribution, saturation line and leakage were obtained, and then the rules and characteristics of seepage field were analyzed in water retaining during construction of flood. T he results showed that seepage fail2 ure may take place on second seepag e control line of dam during construction, so the effectiveness of seepage control system should be ensured and construction quality of second seepage control line must be strictly controlled.