土石坝体(基)渗漏勘察与分析

Survey and analysis on leakage of earth-rock dam( base)

银子河水库设计防渗体系包括黏土心墙、地下混凝土防渗墙和灌浆帷幕,竣工蓄水后坝下出现多处渗水。通过勘察分析认为,坝体(基)渗漏形式为多点面状渗漏,主要发生在地下防渗墙与基岩嵌入部位和灌浆帷幕下部。渗流观测和渗漏计算表明,坝体(基)渗漏对水库正常效益的发挥有一定影响,长期运行有发生渗透变形的可能,危及水库安全。本文介绍了地下渗流的计算、防渗体功能评价,以及坝体渗漏特征分析。

Yinzihe Reservoir design seepage control system includes clay core wall,underground concrete cut-off wall and grouting curtain. Water seepage is discovered in many positions under the dam after project completion and water accumulation. Survey and analysis show that dam（ base） seepage form belongs to multi-point planar seepage mainly in underground cut-off wall,base rock embedded parts and the lower portion of grouting curtain. Seepage observation and leakage calculation show that dam（ base） seepage has certain influence on exertion of reservoir normal benefits. It has the possibility of seepage and deformation due to long-term operation,thereby endangering safety of reservoir. In the paper,underground seepage calculation,anti-seepage function evaluation and dam seepage characteristic analysis are introduced.