大竹河水库沥青混凝土心墙坝渗漏分析及处理方案研究

Analysis on seepage and its treatment of Dazhu-River asphalt concrete core dam

大竹河水库大坝为碾压沥青混凝土心墙石渣坝,水库蓄水过程中坝体渗漏量偏大、浸润线偏高。蓄水至1 212.2 m时,下游坝坡高程1 182~1 185 m出现平行坝轴线的散浸带,并在局部形成流淌状。鉴于水库大坝渗漏问题严重,采取物探检测、连通试验以及对坝体渗漏进行反演计算,结合坝体安全监测资料综合分析,得出坝体沥青混凝土心墙存在渗漏;针对坝体结构特点,对大坝渗漏处理方案进行分析研究后,从有效、可靠、安全、经济等综合分析比选,推荐混凝土防渗墙方案,此工程的渗漏分析及处理方案研究成果可为类似病险工程提供参考和借鉴。

Dazhu-River dam is a rolled asphalt concrete core dam. Its leakage was larger and the satura- tion line was higher than normal value in the process of impoundment. When the water level reached 1 212.2 m, spreading soaking band parallel to the dam axis in elevation 1 182-1 185 m occurred on the surface of the downstream slope, and part of the band was flowing. Since the seepage was serious, geo- physical testing, connectivity testing and inversion calculation were used to analyze the reasons of seep- age. Combined with comprehensive analysis of safety monitoring data, we have found that the asphalt concrete core wall was leaking. According to the structural characteristics of the dam, considering the as- pects such as effectiveness, reliability, safety and economy, the paper analyzed several schemes of seep- age treatment and recommended a rational one, for reference.