大竹河水库沥青混凝土心墙坝渗漏处理

大竹河水库沥青混凝土心墙石渣坝在蓄水过程中出现严重的渗漏问题,影响大坝安全,必须进行除险加固。经对大坝监测(检测)资料等进行综合分析,认为大坝沥青混凝土心墙存在渗漏问题。通过多方案研究比选,从技术可靠性、施工工期、工期投资等多方面考虑,采取在坝体中增设混凝土防渗墙加墙下帷幕方案进行渗漏处理。结合沥青混凝土心墙坝的结构特点,考虑防渗墙施工成槽安全、防渗耐久性及墙体结构受力状态等因素,确定了防渗墙的布置及其技术参数。渗漏处理实施后效果良好,为今后类似沥青混凝土心墙坝病害治理提供了借鉴和参考。

Anti-seepage treatment of asphalt concrete core dam of Dazhu River Reservoir

Serious seepage problem of asphalt concrete core dam of Dazhu River Reservoir was found in the process of impoundment, which threatened the dam safety significantly, so anti-seepage reinforcement must be carried out. According to the comprehensive analysis of the surveillance and monitoring date sources, it was indicated that the asphalt concrete core wall was in leakage. Through study and comparison of several treatment solutions in terms of technology reliability, construction duration and engineering investment, we proposed to add concrete cut-off wall and the lower curtain grouting. According to the structural characteristics of the asphalt concrete core wall and considering the trench-forming safety, the anti-seepage durability and stress condition of the cut-off wall, we determined the layout and technical parameters of the concrete cut-off wall. The anti-seepage effect after the treatment is satisfying, which can provide reference for similar diseased dam treatment in future. 