紫云山水库主坝防渗加固方案比选和实施

Design Plan Selection and Construction of Main Dam Anti-seepage Reinforcement of Ziyunshan Reservoir

为解决紫云山水库主坝渗漏问题,经过多方面深入比较和综合分析,讨论了两种垂直防渗处理方案的优缺点,选取在坝体轴线处原防渗体上游增设垂直防渗体的防渗处理方案,增设垂直防渗体即坝体混凝土防渗墙加坝基灌浆帷幕。防渗墙施工是防渗处理的关键,防渗墙基岩内成槽难度相对较大,综合考虑设计要求和施工成本,工程实施选用了适合坝体与坝基基岩内防渗墙成槽的液压抓斗机,确保了防渗工程的顺利实施,可为类似碾压土石坝防渗加固方案比选和施工提供工程实例参考。

In order to solve the leakage problems of Ziyunshan reservoir, this paper discussed the advantages and disadvantages of two vertical anti-seepage treatment plans. The chosen plan is adding vertical impervious component at the dam axis original anti-seepage upstream which includes concrete cutoff wall in dam body and curtain grouting in the dam foundation. The construction of anti-seepage wall is importantcrucial to seepage treatment, it is very difficult to groove in rock for concrete cutoff wall construction, considering the design requirements and construction costs, this project has selected suitable hydraulic grab machine to groove in dam body and foundation rock, which has ensured successfully implementation of the anti-seepage project. This research is useful to similar projects in terms of providing guidance.