A江水利枢纽—薄双曲拱坝设计.doc
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- 江水 枢纽 薄双曲 拱坝 设计
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1、摘 要A江位于我国东南地区,全长153km ,根据流域规划拟建一座水电站。 A江水利枢纽同时兼有防洪,发电,灌溉,渔业等综合作用,水库正常蓄水位183.75m,设计洪水位184.8m,校核洪水位188.8m,汛前限制水位182m,死水位164m,尾水位103.5m。水库死库容 5.3亿m3,总库容12.8亿m3。A江水利枢纽工程等别为一等,工程规模为大(1)型工程,主要建筑物级别为1级,次要建筑物级别为3级,临时性建筑物级别为4级。A江水利枢纽的主要组成建筑物有挡水建筑物,主副厂房,泄水建筑物,过木筏道等。挡水建筑物是一变圆心变外半径的双曲拱坝,坝顶弦长302m,最大坝高98.88m,坝底厚2
2、6m,坝顶宽8.5m。泄水建筑物由两个浅孔和两个中孔组成:浅孔位于两岸,孔口宽8.5m,高8.8m,进口底高程为164m,出口底高程为154m;中孔位于水电站进水口两侧,孔口宽7.5m,高7.2m,进口底高程为135m,出口底高程为130m。在坝身泄水孔的上下游侧分别布置检修闸门和工作闸门,工作闸门采用弧形闸门,在每一个工作闸门的上方有启闭机房,浅孔启闭机房高程为175.0m,中孔启闭机房高程为161.28m。泄槽支撑结构采用框架式结构。坎顶高程为119m,浅孔反弧半径为33m,中孔反弧半径为50m。泄槽直线段的坡度与孔身底部坡度一致,挑射角=20o,导墙厚度为1.0m, 浅孔导墙高度为8.5
3、m,中孔导墙高度为11m。坝后式厂房装有4台5万kw的发电机组,主厂房长81m,宽18m,副厂房长66m,宽10m,安装场长21m,宽18m。压力管道的直径为4.5m,进水口底高程为153.3m。发电机层高程为115m,尾水管底高程为90.8m,厂房进水口底高程为152.4m。为防止坝基渗漏,在坝基靠近上游侧进行帷幕灌浆,并且为了减少坝基的扬压力,在灌浆帷幕之后设置排水孔。各孔间距均为5.0m。为了防止混凝土产生裂缝,拱坝坝体设置横缝,横缝面上需设置键槽,以咬合加固,增强坝体的抗剪能力。当底宽在4050m以上的拱坝,才考虑设置纵横缝,而本设计中,拱坝坝底宽为26m,小于40m,故可不设置纵缝。
4、Abstract Ajiang is a river in southeast of China, The total length is 153 km. we plan to built a water power station on it. Ajiang hydro complex play parts in flood control, water power, irrigation, water conservancy related fisheries, and so on. The reservoir normal water level is 183.75m, design f
5、lood level is 184.8m, maximum flood level is 188.4m, flood control level is 182m, dead water level is 164m, and tail water level of hydropower station is 103.5m.The dead reservoir capacity is 530,000,000m3, and the total reservoir capacity is 1,280,000,000 m3. The hydraulic engineering grade is Grad
6、e I.The hydro project is consist of water retaining structure, power house, auxiliary room, sluice structure, raft sluice, and so on. The water retaining structure is a double curvature arch dam. The length of the axis of crest dam is about 302m.Maximum height of the dam is 98.88m,the thickness of t
7、he bottom of the dam is 26m,and the width of the top of the dam is 8.5m. The release structure is comprised of 2 mid-level outlets and 2 short-level outlet. The width of the short-level outlet is 8.5m, and the height is 8.8m;the width of the mid-level outlet is 7.5m,and the height is 7.2m.The upstre
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