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鉴于丰满大坝的安全状况 ,1986年确定全面加固 ,确定对上游坝面 2 2 6～ 2 4 5m高程进行防渗补强 .考虑冬季施工、工期紧等因素 ,设计采用沥青混凝土防渗层方案 .防渗工程 1989年 12月开工 ,1990年 6月竣工 .经过验收 ,预制板制作、坝面处理和挂混凝土预制板质量良好 ,仓面处理、锚筋制安、沥青混凝土浇筑等基本达到设计要求 .通过观测分析 ,坝面补强后绝大多数坝段漏水量有明显减少 ,漏水量减少的坝段占观测坝段总数的 85.7% .
In view of the safety status of Fengman Dam, it was determined to be fully reinforced in 1986, and the seepage enhancement at the height of 226-645m of the upstream dam surface was determined. Considering the factors of winter construction and tight schedule, the design of asphalt concrete impermeable layer The seepage control project started in December 1989 and was completed in June 1990. After acceptance, the design of prefabricated panels, dam surface treatment and prefabricated concrete slabs with good quality, storage surface treatment, anchorage system security and pouring of asphalt concrete etc. were basically achieved Requirements.According to the observation and analysis, the water leakage of the vast majority of dam sections after the dam surface reinforcement is obviously reduced, and the dam sections with reduced water leakage account for 85.7% of the total observed dam sections.