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本文从《混凝土重力坝设计规范SDJ21—78(试行)》和《混凝土重力坝设计规范SDJ21—78(试行)补充规定》出发,采用结构优化设计方法。即“GDOD—4重力坝断面优化设计程序”,探讨在不同的下游水深等条件下,带抽排降压设施的重力坝和采用帷幕灌浆及排水孔幕的重力坝两者工程量的差异,以分析重力坝抽排降压设施的经济性。研究结果表明,在正常组合,下游相对水深为0.1～0.2;校核组合,下游相对水深为0.2～0.4时,抽排降压设施可使重力坝的工程量节省3～5%。在某些情况下,如我国安康、漫湾等重力坝枢纽,其下游正常相对水深在0.2～0.3,校核相对水深在0.4～0.5时,采用抽排降压设施,可节省工程量约5～6%。由此可见,在重力坝枢纽设计中,推广采用抽排降压设施,对降低工程枢纽的造价有重要意义。
This paper starts with “Design Specifications for Concrete Gravity Dams SDJ21-78 (Trial)” and “Supplementary Provisions of Design Specification for Concrete Gravity Dam SDJ21-78 (Trial)”, and adopts structural optimization design method. That is, “GDOD-4 gravity dam section optimization design program” to explore the different downstream depth and other conditions, the pumping station with pressure-relief facilities and the use of curtain grouting and drainage holes of the gravity dam of the difference between the two projects, To analyze the economy of gravity dam pumping and depressurization facilities. The results show that in the normal combination, the relative depth of the downstream reaches is 0.1-0.2; when the relative combination depth of the downstream is 0.2-0.4, the pumping and drainage facilities can save 3 ~ 5% of the engineering volume of the gravity dam. In some cases, such as our well-being, Manwan gravity dam hub, the downstream normal relative depth of 0.2 to 0.3, check the relative water depth of 0.4 to 0.5, the use of extraction and depressurization facilities, can save about 5 ~ 6%. Thus, in the design of gravity dam hub, promoting the use of extraction and depressurization facilities is of great significance in reducing the construction cost of the engineering hub.