A江水利枢纽—复杂地基上双曲拱坝设计【含CAD图纸+文档】
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压缩包内含有CAD图纸和说明书,均可直接下载获得文件,所见所得,电脑查看更方便。Q 197216396 或 11970985
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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184.0m,设计洪水位186.9m,校核洪水位189.8m,汛前限制水位182m,死水位164m,尾水位103.5m。水库死库容9.3亿m3,总库容12亿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353.32m,最大坝高100.3m,坝底厚26m,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7.4m,高7.4m,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,浅孔启闭机房高程为170m,中孔启闭机房高程为150m。泄槽支撑结构采用框架式结构。坎顶高程为118m,浅孔反弧半径为35m,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12m。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152.3m。发电机层高程为114.8m,尾水管底高程为90.8m,厂房进水口底高程为152.3m。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26m,小于40m,故可不设置纵缝。Abstract Ajiang hydrocomplex play parts in flood control,water power,irrigation,water conservancy related fisheries,and so on.The reservoir normal water level is 184.0m,design flood level is 186.9m,maximum flood level is 189.8m,flood control level is 182m,dead water level is 164m,and tailwater level of hydropower station is 103.5m.The dead reservoir capacity is 930,000,000m3,and the total reservoir capacity is 1,200,000,000 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 curvature arch dam.The length of the axis of crest dam is about 353.32m.Maximum height of the dam is 100.3m,the thickness of the 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 outlet and 2 short-level outlet.The width of the mid-level outlet is 7.4m,and the height is 7.4m;the width of the short-level outlet is 8.5m,and the height is8m.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 are above the mid-level outlet service gate are at an elevation of 150 metres,and the other two rooms are at an elevation of 170 metres.The intake of the mid-level outlet is at an elevation of 135 metres,and the intake of the short-level outlet is at an elevation of 164 metres. The type of the power house is at damtoe.The dimensions of the power house and the auxiliary room are 81m18m and 66m10m.The generator floor is at an elevation of 114.8 metres,and the bottom of the draft tube is at an elevation of 90.8 metres,and the intake of hydropower station is at an elevation of 152.3 metres. In case of leakage of the dam foundation,there is grouting curtain at the base of the dam,behind which there are drainage holes which decrease the uplift pressure of the dam foundation. In radial directions there are transverse joints in which there are keys,and because the thickness of the bottom of the dam is smaller than 4050 metres,there is no longitudinal joint.目 录摘 要-1 -ABSTRACT- 2 -第一章 综合说明- 5 -1.1 概述- 5 -1.1.1 枢纽概述- 5 -1.1.2 设计要求- 5 -1.2 工程特性表- 6 -第二章 设计资料- 7 -2.1 枢纽任务- 7 -2.2 基本资料- 7 -2.2.1 自然地理- 7 -2.2.2 工程地质- 9 -2.2.3 筑坝材料- 10 -2.2.4 库区经济及其它- 11 -第三章 枢纽主要建筑物的型式与总体布置- 12 -3.1 工程等级及技术规范设计标准- 12 -3.1.1 工程等级- 12 -3.1.2 技术规范- 12 -3.1.3 洪水标准- 12 -3.2 调洪演算及设计基本数据- 12 -3.2.1 调洪演算的目的- 12 -3.2.2 调洪演算的原理- 12 -3.2.3 计算方法- 14 -3.2.4泄洪方案的选择- 14 -3.3 枢纽组成建筑物- 17 -3.4 坝型选择- 17 -3.4.1 坝型初选- 17 -3.4.2方案比较- 19 -3.4.3 坝体形态选择- 20 -3.5 泄水建筑物型式选择- 20 -3.6 厂房及引水系统布置- 21 -3.7 枢纽总体布置- 21 -第四章 拱坝设计- 21 -4.1拱坝型式及布置- 21 -4.1.1拱坝剖面设计- 21 -4.1.2拱坝的布置- 22 -4.2 荷载及其组合- 23 -4.2.1 荷载及计算- 23 -4.2.2 荷载组合- 28 -4.3 计算原理和计算方法- 28 -4.3.1 计算原理- 28 -4.3.2 计算方法- 29 -4.4 应力与强度分析(电算,手算)- 29 -4.4.1 应力控制指标- 29 -4.4.2 电算- 30 -4.4.3 手算- 31 -4.5 坝肩稳定验算- 33 -4.5.1 验算原理- 33 -4.5.2 验算工况- 36 -4.5.3 验算结果- 36 -第五章 泄水建筑物设计- 36 -5.1 基本资料- 36 -5.2 泄水建筑物组成与布置- 36 -5.3 泄槽设计- 37 -5.3.1 泄槽尺寸- 37 -5.4 消能与防冲- 39 -5.4.1 挑距计算- 39 -5.4.2冲坑计算- 39 -5.4.3防冲评价- 39 -5.4.4 消能率计算- 39 -5.4.5消能防冲计算成果- 40 -5.5泄水孔口应力及配筋- 40 -5.5.1计算原理- 40 -5.5.2孔口作用力- 40 -第六章 坝体细部构造及地基处理- 43 -6.1 坝体构造与细部结构设计- 43 -6.1.1 坝体与坝面- 43 -6.1.2 坝体分缝- 43 -6.1.3 坝内廊道和坝后工作桥- 43 -6.2 坝基处理- 44 -6.2.1 坝基处理的一般要求- 44 -6.2.2 地基的处理和开挖- 44 -6.2.3 坝基排水孔- 46 -结束语- 47 -参考文献- 48 -目 录第一章 调洪演算- 3 -1.1调洪演算的原理- 3 -1.2 泄洪方案的选择- 3 -1.2.3 确定坝高- 5 -第二章 大坝工程量比较- 6 -2.1 大坝剖面设计计算- 6 -2.2工程量比较- 10 -第三章 第一建筑物大坝的设计计算- 11 -3.1 拱坝形式尺寸及拱坝布置- 11 -3.1.1 坝型选择双曲拱坝- 11 -3.1.2拱坝的尺寸- 11 -3.2荷载组合- 13 -3.3拱坝的应力计算- 13 -3.3.1对荷载组合,使用FORTRAN程序进行电算- 13 -3.3.2对荷载组合进行手算- 14 -3.4坝肩稳定计算- 21 -3.4.1计算原理- 21 -3.4.2验算工况- 22 -3.4.3验算步骤- 22 -第四章 泄水建筑物的设计- 25 -4.1 泄水建筑物的型式尺寸- 25 -4.2 泄槽设计计算- 25 -4.3 导墙设计- 26 -4.3 消能防冲计算- 26 -4.3.1 水舌挑距- 26 -4.3.2 冲刷坑深度- 27 -4.3.3 消能率计算- 27 -4.3.4 孔口应力计算及配筋- 28 -参考文献- 31 -附录一- 32 -附录二- 33 -第一章 调洪演算1.1调洪演算的原理 先对一种泄洪方案,求得不同水头下的孔口泄洪能力,并作孔口泄洪能力曲线,再假定几组最大泄流量,对设计(校核)洪水过程线进行调洪演算,求得这几组最大泄流量分别对应的水库存水量,查水位库容曲线,得出这几组最大泄流量分别对应的上游水位,并作最大泄流量与上游水位的关系曲线。上述两条曲线相交得出一交点,此交点坐标即为设计(校核)情况下的孔口最大泄流量及相应的水库水位,再对其它泄洪方案按同样的方法进行调洪演算,最后选定的泄洪方案孔口最大泄流量应接近并不超过容许值,库水位又相对比较低。1.2 泄洪方案的选择1.2.1 对以下三种方案进行调洪演算4表孔+2中孔2浅孔+2中孔4中孔方案一:4表孔+2中孔表孔:堰顶高程179m,孔宽12m m=0.48 , =412=48m 中孔:进口高程135m,出口高程130m,孔口宽7.5m,高7m 闸门开度a=7m,孔口宽度B=27.5=15m, =0.96-0.227a /表1-1 四表孔二中孔泄流方案四表孔二中孔泄流水头(m)182186190194表孔下泄流量(m3/s)530.29051890.0753723.245928.828中孔侧收缩系数0.9272370.9297330.9318760.933736中孔下泄流量(m3/s)3003.3123133.1193257.7763377.85总下泄流量(m3/s)3533.6035023.1946981.0169306.678起调流量3871.603 m3/s,做出4表孔+2中孔的泄洪能力曲线及水库水位与所需的最大泄流量的曲线,由两条曲线的交点可以得出:最大泄洪流量:设计6420 m3/s 校核7350 m3/s最高水位 :设计188.3m 校核190.4m方案二:2浅孔+2中孔浅孔:进口高程164m,出口高程154m,孔口宽8.5m,高8m =0.96-0.227a / a=7m B=17m中孔:进口高程135m,出口高程130m,孔口宽7.4m,高7.4m =0.96-0.227a / a=7.4m B=14.8m表1-2 2浅孔2中孔泄流方案2浅孔2中孔泄流水头(m)182186190194浅孔侧收缩系数0.8843330.8951430.903250.909556浅孔下泄流量(m3/s)2609.8172853.3813078.023287.524中孔侧收缩系数0.9252220.9278810.9301630.932143中孔下泄流量(m3/s)3119.3373255.2643385.7623511.43总下泄流量(m3/s)6067.1536446.6466801.7817136.953起调流量6067.2 m3/s,做出2浅孔+2中孔的泄洪能力曲线及水库水位与所需的最大泄流量的曲线,由两条曲线的交点可以得出:最大泄洪流量:设计6520 m3/s 校核7000 m3/s最高水位 :设计186.9m 校核189.8m方案三:4中孔中孔:进口高程135m,出口高程130m,孔口宽7.5m,高7.5m =0.96-0.227a / a=7.5m B=30m表1-3 4中孔泄流方案4中孔泄流水头182186190194中孔侧收缩系数0.9272370.9297330.9318760.933736中孔下泄流量(m3/s)6184.4486437.1386679.8046913.548起调流量6184.4 m3/s,做出4中孔的泄洪能力曲线及水库水位与所需的最大泄流量的曲线,由两条曲线的交点可以得出:最大泄洪流量:设计6540m3/s 校核6640 m3/s最高水位 :设计186.9m 校核189.8m1.2.2 泄流方案的选择由下游容许下泄流量在设计情况下为6550 m3/s,校核情况下为7550 m3/s.选择泄洪防方案,即设置两浅孔,孔口尺寸为8.5m8m,进口底高程为164m,出口底高程154m,两中孔,孔口尺寸为7.4m7.4m,进口底高程为135m,出口底高程为130m。设计洪水时,设计水位为186.9m,下泄流量为6520m3/s,小于允许流量6550m3/s,。校核洪水时,校核洪水位为189.8m,下泄流量为7000m3/s,小于允许下泄流量7550 m3/s。1.2.3 确定坝高1.2.3.1波浪三要素计算(采用官厅水库公式)坝顶超出水库静水位的高度h为 式中 V0计算风速, m/s; D库面吹程,m; 平均波高,m;平均波周期,s;H水深,m。1.2.3.2 坝顶高程计算 坝顶高程= Max设计洪水位+h设,校核洪水位+h校 其中: h=2式中h1%累积频率1%的波浪高度(m), hz波浪中心线高出静水位的高度 (m), hc取决于坝的级别和计算情况的安全超高(等级为1级时:设计hc=0.7m,校核hc=0.5m)。经计算得:坝顶高程为192.3米,即拱坝坝高100.3米。第二章 大坝工程量比较2.1 大坝剖面设计计算混凝土重力坝:坝前水深:189.8-92=97.8m最大坝高:192.3-92=100.3m基本剖面 根据应力条件,确定坝底最小宽度 式中 =24kN/m3 =10kN/m3 扬压力折减系数1取0.25则B=97.8/(24/10-0.25) 1/2=68.4m 按稳定条件确定坝底最小宽度 式中=1.10 =0.7 =0 =0.25 则B=1.197.8/0.7(24/10+0-0.25)=73.3m综合,取坝底最小宽度B=74m实用剖面坝顶宽度:取坝高的810%,即(810%)100.3=(8.0210.03)m,取为10m下游坡度为1:0.75 上游设折坡,折坡点距坝底的高度取为坝高的1/32/3范围内,即(1/32/3)100.3=(33.166.2)m,取为54m。上游折坡的坡度取为1:0.15坝底宽度为6+(100.3-2.48-13.33)0.75+10=81.47m排水位置设计洪水最大下泄流量为6520m3/s,则Z下=114.4m,水头H=189.8-114.4=75.4m廊道上游壁到上游坝面距离不小于0.050.1倍水头,且不小于45m, 即 (0.050.1)75.4=(3.777.54)m,取为6m。宽取2.5m,高取3m。荷载计算设计水位时坝体自重W1=1/264024=2880 kN/mW2=109524=22800 kN/mW3=1/26081.124=58392 kN/mW= W1+ W2+ W3=84072 kN/m水压力垂直水压力W水上=108.1(186.9-146)+108.154/2=5499.9kN/mW水下=1/210(114-92)0.75=1815 kN/m水平水压力P上=1/20H上2=1/210(186.9-92)2=44175.5 kN/m P下=1/20H下2=1/210(114.0-92)2=2420.0 kN/m扬压力 =22m,m, U1=102281.47=17923.4 kN/m U2=100.2572.914.1=2569.71 kN/m U3=1/20.2572.967.3710=6139.09 kN/m U4=1/21014.154.675=3854.59 kN/m浪压力 =54.31 kN/m泥沙压力 垂直泥沙压力8.5230.15/2=337.2 kN/m 水平泥沙压力Ph=1/2nhn2tg2(45o-n/2)式中 n=8.5kN/m3 hn=115-92=23m n =10o 故 Ph=1/28.5232tg2(45o-10o/2)=1582.9kN/m稳定校核 设计状况 f(W-U)/ P=0.75/3(93575.4+5499.9+1815-17923.4-(2569.73+3854.591.1)-6139.091.2+337.2)+0.5/381.4710/(44174.5-2420+1582.971.2+54.311.2)=1.16K校核状况f(W-U)/ P=0.75/3(93575.4+5734.8+1898.4-18330.75-(2654.325+3981.571.1)-6341.21.2+337.2)+0.5/381.4710/(47824.2-2531.25+1582.971.2+19.641.2)/1.2=1.12K稳定满足要求应力分析(取坝基面) 设计水位力(kN)力臂(m)弯矩(105kN/m)重力3799.227.6351.055248.835.3351.85844568.1786.91静水压力5499.936.92.0344175.531.63-13.97181529.735-0.5424207.330.177扬压力17923.4002509.7333.685-0.8456139.094.18-0.263854.5936.035-1.39淤沙压力1582.97180.285浪压力忽略上游拉应力 =420.20 满足 =2183.60 满足 =2306.72.5 满足要求。对中孔:=1.0 q=244.33m3/s H=186.9-114.1=72.8m t=114.1-92=22.1m tk=q0.5H0.25-t=1.0244.330.572.80.25-22.1=23.56m L/ tk=153.7/23.562.5 满足要求。4.3.3 消能率计算对冲消能主要研究对冲点处水舌相撞的动能损失。令m1=q1,m2=q2,为水的密度。对x,y,z三个方向计算碰撞体的动能损失为: Tx=/2q1q2/(q1+q2) (V1cos1sin1+V2cos2sin2)2Ty=/2q1q2/(q1+q2) (V1 cos11-V2cos2cos2)2Tz=/2q1q2/(q1+q2) (gt1-V1sin1-gt2+V2sin2)2T=Tx +Ty +TzT=/2(q1 V12+ q2 V22)交汇点处的消能率=T/T本设计中:1=2= 20o 1=2= V1= V2 = V=38.42m/s q1= q2 t1= t2Tx=/2q/2(Vcossin1+Vcossin2)2=q(Vcossin) 2Ty=/2q/2(Vcoscos1-Vcoscos2)2=0Tz=/2q/2(Vsin-Vsin)2=0T=/2(q1 V12+ q2 V22)= q V2对浅孔:q=170.82m3/s =41 oTx=170.82(38.42cos 20sin41 ) =95832T=q V2=170.8238.422=242146=T/T=38.0%对中孔:q=244.33m3/s =42 oTx=244.33(38.42cos 20sin41) =142588T=q V2=244.3338.42=360654=T/T=39.5%4.3.4 孔口应力计算及配筋4.3.4.1计算原理 将坝内孔口视为无限弹性体中小孔进行计算4.3.4.2应力计算浅孔出口计算表4-1 浅孔出口应力计算0.30.40.50.60.70.80.9111.0621.12551.21941.33871.46451.5731.65871.763Py30.54620.58040.62650.68330.80211.01161.54814.484360.04230.06050.05710.0056-0.1191-0.3264-0.6041-0.9362184.7369889.8036597.29593106.8149116.8525125.5097132.3477140.6698343.581346.3101249.9884454.5205163.9995680.71556123.5229357.802363.3751174.8272954.5560090.446824-9.50299-26.0435-48.2011-74.69941-27.612-29.263-31.7044-34.8062-38.077-40.898-43.1262-45.8383-14.2012-15.0904-16.289-17.7658-20.8546-26.3016-40.2506-116.5926-1.0998-1.573-1.4846-0.14563.09668.486415.706624.341210.04230.06050.05710.0056-0.1191-0.3264-0.6041-0.9362Px30.54620.58040.62650.69330.80211.01161.54814.484261.0621.12551.21941.33871.46451.5731.65871.76318.8872312.7110511.996711.17656-25.0229-68.5766-126.921-196.6963114.7566121.942131.6277145.6623168.5212212.5372325.2558942.13046223.1262236.4676256.1959281.2609307.6915330.4873348.4929370.40631-1.0998-1.573-1.4846-0.14563.09668.486415.706624.34123-14.2012-15.0904-16.289-18.0258-20.8546-26.3016-40.2506-116.5896-27.612-29.263-31.7044-34.8062-38.077-40.898-43.1262-45.838总应力164.9124171.678776.1036473.0396356.8491524.52143-21.9933-77.52273129.9355138.0714149.0381164.3912190.8116240.6495368.27751066.7526197.7895210.4588227.5629246.7559263.2081272.0322272.8721274.2101表4-2 浅孔进口应力计算0.30.40.50.60.70.80.9111.0621.12551.21941.33871.46451.5731.65871.763Py30.54620.58040.62650.68330.80211.01161.54814.484360.04230.06050.05710.0056-0.1191-0.3264-0.6041-0.9362169.7627873.934180.1023987.939296.20301103.3304108.96115.8115335.8798838.1264841.1547944.8859852.6899566.452101.6947294.573762.7786873.9742453.7508990.367864-7.82368-21.4412-39.6833-61.4991-16.992-18.008-19.5104-21.4192-23.432-25.168-26.5392-28.2083-8.7392-9.2864-10.024-10.9328-12.8336-16.1856-24.7696-71.74886-0.6768-0.968-0.9136-0.08961.90565.22249.665614.979210.04230.06050.05710.0056-0.1191-0.3264-0.6041-0.9362Px30.54620.58040.62650.69330.80211.01161.54814.484261.0621.12551.21941.33871.46451.5731.65871.76311.0768731.5402091.4536520.142565-3.03205-8.30949-15.3792-23.8338313.9051614.7758215.9494417.6500320.4198625.7533139.41153114.1588627.036428.6529831.0434934.0806237.2832440.0454342.2271844.882451-0.6768-0.968-0.9136-0.08961.90565.22249.665614.97923-8.7392-9.2864-10.024-11.0928-12.8336-16.1856-24.7696-71.74726-16.992-18.008-19.5104-21.4192-23.432-25.168-26.5392-28.208总应力153.1708556.498361.1320466.5729771.6445675.0752876.7072378.74889332.3066434.329537.0562240.5104147.4426159.8341291.56702265.2364612.1462813.6512214.3703812.939697.933162-1.34138-14.3297-29.8453表4-3 中孔出口应力计算0.30.40.50.60.70.80.9111.0621.12551.21941.33871.46451.5731.65871.763Py30.54620.58040.62650.68330.80211.01161.54814.484360.04230.06050.05710.0056-0.1191-0.3264-0.6041-0.93621206.3891218.7297236.9782260.163284.6109305.6968322.3518342.62143106.1485112.7949121.754132.7925155.8801196.5943300.8578871.478968.22058211.7575711.096811.088304-23.1459-63.4326-117.401-181.9411-61.9146-65.6167-71.091-78.0462-85.3804-91.7059-96.7022-102.7833-31.8435-33.8373-36.525-39.8364-46.7624-58.9763-90.2542-261.4356-2.46609-3.52715-3.32893-0.326486.9435319.0291235.2190354.5804610.04230.06050.05710.0056-0.1191-0.3264-0.6041-0.9362Px30.54620.58040.62650.69330.80211.01161.54814.484261.0621.12551.21941.33871.46451.5731.65871.76316.6508299.5124158.9778330.880488-18.7261-51.3199-94.9826-147.199385.8790391.2562998.5046109.0076126.1142159.0539243.4078705.05086166.9783176.9624191.7263210.4838230.2633247.3228260.7974277.19651-2.46609-3.52715-3.32893-0.326486.9435319.0291235.2190354.580463-31.8435-33.8373-36.525-40.4194-46.7624-58.9763-90.2542-261.4296-61.9146-65.6167-71.091-78.0462-85.3804-91.7059-96.7022-102.783总应力1148.6592159.0983171.5361182.6708187.448181.7002165.8859147.22033128.3406136.3766147.2087161.5443188.4694237.6957363.75711053.6666110.8182119.5761128.4031133.1994128.6806111.213481.9134347.05294表4-4 中孔进口应力计算0.30.40.50.60.70.80.9111.0621.12551.21941.33871.46451.5731.65871.763Py30.54620.58040.62650.68330.80211.01161.54814.484360.04230.06050.05710.0056-0.1191-0.3264-0.6041-0.9362177.1861681.8013488.6259997.29672106.4399114.3256120.5543128.1348339.6978242.1834745.5340249.6622458.2966373.52309112.5159325.918963.0743644.397144.1500280.407008-8.65619-23.7228-43.906-68.0431-48.1086-50.9852-55.2388-60.6431-66.3419-71.2569-75.1391-79.86393-24.7429-26.2921-
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