平原病险水库堤坝渗流控制方法研究

根据2000年实测数据绘制了在不同水位下水库堤坝测压管等水位线图,建立垂向二维有限元法渗流数值模型,模拟了尔王庄水库堤坝11个典型断面稳定渗流状态。综合分析测压管实测数据、现场勘查和计算结果,确定水库渗漏严重坝段。计算得出全封闭、悬挂式高压喷射灌浆防渗墙两加固方案下坝体单宽渗流量、浸润线、渗透比降等水力要素,结果表明全封闭设计可降低70.04%~98.32%渗流量,截渗沟或明渠处溢出渗透坡降降至0.001~0.023,控制效果显著。

Research on seepage control methods for dams of sick plain reservoirs

Based on an investigation of the current seepage status of the Erwangzhuang reservoir,which is located in the piedmont plain of the Haihe Basin,a piezometric head correlation analysis method was deduced to identify the reliability of observed prototype data.The seepage stability situation of the dam foundation was examined with the variation trend analysis of the piezometric potential,and under different reservoir levels the piezometric potential line schemes of the dam foundation ware presented.With the finite element method,a vertical 2-D seepage numerical model was established,and the steady state seepage of 11 representative cross-sections in the reservoir dam foundation was simulated.With a comprehensive analysis of the observed piezometric data,leakage locale perambulation and numerical simulation,the serious leakage dam sectors were determined.Hydraulic factors including the discharge per unit width,saturation line and seepage gradient ware calculated to predicate the seepage control efficiencies of the totally enclosed and suspended high pressure spraying impervious wall design schemes.Results show that 70.04%-98.32% seepage quantity can be reduced,and seepage gradient at counter drain reduces to 0.001-0.023 under totally enclosed reinforcing design,which will contributes to a more effective seepage control.