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在水土流失严重的黄土丘陵沟壑区,淤地坝是治沟工程的一项主要措施.规划设计的较大淤地坝,可以一次建成,也可分期施工.本文采用试算法选择最佳前期坝高并结合当地建坝实例进行技术经济分析,结果是,对不设溢洪道的“两大件”骨干淤地坝,在不降低设计防洪标准条件下,分两期施工,于前期坝的淤面上加高至设计坝高,可比一次建成节省投资1/4左右.
In the loess hilly and gully regions where soil and water loss are serious, dams are one of the major measures for trench ditching project.During the planning and design of large dikes dam, it can be built once or in phases.The paper chooses the best pre-dam High and combined with the local dam example for technical and economic analysis, the result is that for the absence of spillway “two large” key silt dam, without reducing the design flood control conditions in two phases, in the pre-dam surface silt On the heightening of the design dam height, can save investment about 1/4 or so.