U型灌溉渠道断面设计及水力要素计算表

1、U型灌溉渠道断面设计及水力要素计算表编号代号名称计算式单位型号及数据UBJ30UBJ35UBJ40UBJ45UBJ50UBJ55UBJ60UBJ65UBJ70lB上口宽B=b+2Dbmm3003504004505005506006507002B下口宽b=B-2Dbmm2602903203503804l04404705003b上下口宽的一半b=l/2(B-b)mm2030405060708090l004h弦心距h=bDb/D2DH1Dmml0l5202530354045505Hl上部高度Hl=H-r+Dhmm2603203904405005606206707306r圆弧半经r=1/2DbD(1+

2、Db2/H1)mml30l46l6ll77l922082242392557H总高度H=Hl+rThmm38045l53l59l66273380486493580圆心角0=2arcos（h/r）度l7l.l8l68.l9l65.75l63.74l62.05l60.62l59.39l58.32l58.749I弧长l=2n0r/360mm39042846650554458362266l700l0L腰线长L=DH21+Db2mm26l32l392443504564625676737llX湿周X=l+2L2h/cosUmm85ll0l0ll90l33014901216511811h1953=H1-211

3、3h超高H0mm303O3O3O3O3O3O3O3O13a锥度a=artg(ub/H1)度4.405.365.866.486.847.137.357.657.8O14BO过水面宽BO二b+2Db-2htgamm295.4344.4393.8443.2492.8542.5592.3641.9691.815HO上部水深HO=H1-hmm29534439444349354259264269216Q过水面积Q=l/2(b-bO)H+_nr6/360(l/2)bUbcm288O121O15292O2725193O5936534247493917R水力半经R=Q/Dmm1O312O137152169185

4、2O221723418C谢才系数C=(1/n)R1/6m3/s4O.341.342.243.O43.744.445.145.646.219q流量系数Q=QCURm3/s1.141.732.553.4O4.535.847.4O9.O111.O32OS断面积S=Q+1/2(BO+B)hcm29691314174821632666322238324437514821a壁上口厚a=l/2(A-B)cm6.OO6.OO6.OO6.OO6.OO7.OO7.OO7.OO7.OO22A总宽度A=B+2acm42O47O52O57O62O69O74O79O84O23e底砼厚e=G-Hmm50595958585756555524f拱高f=H-H1mm12013614115216317318419520525G砼高G=H+emm430510590650720790860910990266S砼面积6s=AG-Sm20.0840.1080.1320.1540.1800.2230.2530.2750.31727Q渠道过水流量Q=QCDRii=l/500时m3/s0.0510.0770.1140.1520.2030.2610.3310.4030.493