百色水利枢纽地下厂房渗控方案选择

Selection on scheme of seepage control for underground powerhouse of Baise Water Control Project

对百色水利枢纽地下厂房的渗控方案,提出了加深大坝防渗帷幕至相对隔水层方案和厂前设置独立的防渗排水系统2个方案。通过渗流场三维渗流数学模型有限元分析,论证了设置独立的防渗排水系统的可行性,对其可能出现的风险进行了评估,并提出了当出现渗流异常时防止对左岸坝后的山体稳定以及地下厂房带来不利影响的预防措施和补救措施。该渗控方案已经历了2年高水位运行,监测成果与分析计算成果基本一致,说明设计所采用的渗控方案是成功的。

Two schemes of the seepage control for the underground powerhouse of Baise Water Control Project are proposed ; i.e. deepening the anti-seepage curtain of the dam to the relative water-resisting layer and constructing an independent drainage system of seepage control in front of the underground powerhouse. Through a finite element analysis with 3D seepage mathemat- ical model made on the seepage field, the feasibility of the independent drainage system of seepage control is demonstrated and then the prevention measures and remediation measures for both the mountain stability of the left abutment after dam in case of abnormal seepage and the unfavorable impact from the abnormal seepage on the underground powerhouse are proposed as well. At present, the scheme has been implemented for the actual operation for two years; for which the related monitoring data are basically consistent with those from the analysis and calculation concerned ; it shows that the adopted seepage scheme in the design is successful.