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1 前言义马市董沟水库位于市区生态公园内,大坝为均质土坝,坝长129m,坝高22.4m,坝顶宽4.5m,总流域面积3.8km~2,总库容40.8万m~3,兴利库容26.7万m~3,是一座以灌溉为主兼养鱼的小(Ⅱ)类水库。水库规模虽然不大,但在“十年九旱”地表和地下水资源十分贫乏的义马市,除了具有保证生态公园林木灌溉用水的功能外还为义马市市民提供了休闲娱乐的场所。该水库于1973年12月初由附近村民动工兴建,1977年5月底停工,1982年11月,由千秋乡水利站组织群众继续施工,1983年5月底建成投入使用。大坝建成蓄水至今,在坝址处就一直存在渗漏现象,其渗漏量随水位上升而增大,在2000年7月13日,突降暴雨,降雨量84mm,库水位急升5m,坝址渗漏加剧,坝体东侧出现管涌,导致大坝背水坡东侧坝趾处发生滑坡,大坝出现险情。在除险加固中,由于采取了“抛石挤淤”技术,成功地解决了库底淤泥软弱、挖除工程量大、运输困难等施工技术难题,获得了显著的效果。
1 Introduction Dongmao Reservoir in Yima City is located in the urban ecological park. The dam is a homogeneous earth dam with a dam length of 129m, a dam height of 22.4m and a crest width of 4.5m. The total basin area is 3.8km ~ 2 and the total reservoir capacity is 408,000 m ~ 3, XingLi storage capacity of 267000 m ~ 3, is a mainly irrigated fish (Ⅱ) reservoir. Although the scale of reservoirs is not large, in Yima City, where the surface of “nine years of drought” and the groundwater resources are very scarce, besides providing the functions of water for irrigation and irrigation of ecological parks and trees, it also provides a place for leisure and entertainment for Yima City citizens . The reservoir started construction by nearby villagers in early December 1973 and was stopped at the end of May 1977. In November 1982, Qianqiu Township Water Resources Station organized the masses to continue construction and put it into use by the end of May 1983. The dam has been built so far, there has been leakage at the dam site, the leakage increases with the water level increases on July 13, 2000, sudden heavy rainfall, rainfall 84mm, the reservoir water level soared 5m , The seepage at the dam site aggravated, and the pipe pounding on the east side of the dam led to the landslide at the dam-toe at the east side of the dam’s backwater and the dam’s danger. In the project of reinforcement and elimination, due to adopting the technique of “throwing stone and squeezing silt”, it successfully solved the construction technical problems such as the weak silt in the reservoir bottom, large amount of excavation works, and transportation difficulties, and achieved remarkable results.