复杂地基下双曲拱坝设计说明书.doc
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1、摘 要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184.75m,设计洪水位185.8m,校核洪水位187.7m,汛前限制水位182m,死水位164m,尾水位103.5m。水库死库容4.80亿m3,总库容10.81亿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,坝顶弧长303m,最大坝高98m,坝底厚25m,坝顶宽8.3m。泄水建筑物由两个浅孔和两个中孔组成:浅孔位于两岸,孔
2、口宽8m,高8.5m,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8m,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,检修闸门采用平板门,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,浅孔启闭机房顶高程为185m,中孔启闭机房高程为160m。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40m,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1m, 浅孔导墙高度为8.5m,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8
3、1m,宽18m,副厂房长60m,宽10m,安装场长21m,宽18m。压力管道的直径为4.6m,进水口底高程为152.7m。发电机层高程为114.8m,厂房顶高程130.5 m,尾水管底高程为90.8m。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。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25m,小于40m,故可不设置纵缝。Abstract Ajiang hydrocomplex play parts in flood
4、control,water power,irrigation,water conservancy related fisheries,and so on.The reservoir normal water level is 183.5m,design flood level is 185.8m,maximum flood level is 187.7m,flood control level is 182m,dead water level is 164m,and tailwater level of hydropower station is 103.5m.The dead reservo
5、ir capacity is 480,000,000m3,and the total reservoir capacity is 1,081,000,000 m3. The hydraulic engineering grade is Grade I. The hydroproject is consist of water retaining structure,power house,auxiliary room,sluice structure,raft sluice,and so on. The water retaining structure is a double curvatu
6、re arch dam.The length of the axis of crest dam is about 303m.Maximum height of the dam is 98m,the thickness of the bottom of the dam is 25m,and the width of the top of the dam is 8.3m. The release structure is comprised of 2 mid-level outlet and 2 short-level outlet.The width of the mid-level outle
7、t is 8m,and the height is 8.5m;the width of the short-level outlet is 7.5m,and the height is 8m.The upstream and the downstream side of every outlet are a bulkhead gate and a operating gate which is a radial gate.There is a room where a gate hoist is put above every service gate.The two rooms which
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