某碾压混凝土坝“有限渗控”措施及效果分析

Analysis of a Roller Compacted Concrete Dam's “Finite Seepage Control”Measure and Effect

针对某碾压混凝土坝坝基岩体具强透水性,高角度断层,裂隙和裂隙密集带等断裂构造发育,高角度裂隙面,层面及缓倾角裂隙面中泥质充填,且浅部没有相对隔水层这些工程地质难点,结合水库长期运行监测资料,对采取悬挂帷幕、坝基排水与水平铺盖相结合的封闭渗流控制措施的有效性进行分析。评价认为目前渗控措施有效,渗漏量不大,防渗效果较好。在当前过度防渗、凸显垂直封闭的大环境下,通过对该水库垂直防渗和水平铺盖成功结合的实例,针对性提出"有限渗控"的设计理念,可以较好地解决无限(深)透水边界渗控难题。

A roller compacted concrete dam foundation rock mass has fracture structure development such as strong water permeability,high angle fault,fissures and fissures concentration areas,it also has high angle fracture,argillaceous filling in the level and low-angle dip fissure surface and shallow layer has no relative water-resisting layer. According to these engineering geological difficulties and combined with the reservoir operation monitoring data for a long time,it analyzed the closed seepage control measures＇effectiveness that using hanging curtain and dam foundation drainage combined with horizontal bedding and considered that the current seepage control measures were effective,the amount of seepage was not big and the seepage control effect is better. In the current situation of excessive seepage control and stressing on vertical close and through this reservoir＇s successful instances of vertical seepage combination with horizontal bedding,it put forward the design concept of＂finite seepage control＂ which could well solve the infinite （deep）permeable boundary seepage control problem.