向家坝水电站坝基渗控效果研究

Study on Effect of Seepage Control Measures of the Dam base at Xiangjiaba Hydropower Station

为了降低坝基扬压力和减少坝基渗漏量,向家坝工程在坝基设置了防渗帷幕和排水孔幕等渗控措施。基于饱和渗流理论,建立了典型坝段渗流计算模型,采用FLAC3D软件渗流分析模块对坝基渗流场进行了计算,研究了坝基扬压力和排水孔涌水量在不同情况下的变化规律。研究结果表明,向家坝坝基渗控措施排水降压效果明显,可以满足大坝安全稳定的要求。研究成果可对类似工程渗控设计提供参考。

For reduction of the uplift pressure and leakage of the dam base of Xiangjiaba hydropower station, impervious curtain and drainage hole are set as seepage control measure.Based on the saturated seepage theo- ry, seepage model of typical dam segment is constructed for understanding the variation law of the uplift pres- sure and water inrush of drainage hole in different condition with FLAC3D software.The research results indi- cate that the seepage control measure of Xiangjiaba hydropower station could effectively decrease the uplift pressure of the dam base.The safety of the dam stability could be satisfied.The research results could also be referenced by other hydropower engineering.