侧槽溢洪道设计

目录TOC\o"1-1"\h\z\u资料：2(一)计算测槽长度L.3〔二〕计算测槽末端水深。3〔三〕确定控制断面坎高。4〔四〕计算各断面流量。5(五)测槽水面曲线计算。6〔六〕泄槽计算。13〔七〕泄槽横断面布置15〔八〕消能防冲设计16资料：某大〔2〕型水库，正常蓄水位为30m,设计洪水位为32m(相应泄流量为150m3/s),校核洪水位33.43m,〔相应泄流量为210m3/s)。该地区最大风速的多年平均值为16.9m/s,坝肩山头较高，岸坡较陡。布置溢洪道泄槽处山坡坡度约为1:4，泄槽水平投影长约65m,泄槽宽8m。该地区地震根本烈度为Ⅵ度。地表为全风化粉砂岩，基岩为寒武系八村组粉粉砂岩强风化层。强风化层地基承载力标准值可取500Kpa。由坝肩山头较高，岸坡较陡可以知道，设计该溢洪道为侧槽式溢洪道。堰顶高程取30m.(1)计算测槽长度L.L=采取设计洪水位计算，式中Q溢洪道最大泄流量取150m3/s，采取宽顶堰，那么堰顶水头H0=32-30=2m。流量系数m=0.35.测槽底坡i=0.1.代入数据：L===34.21m。〔2〕计算测槽末端水深。由设计地形(泄槽宽8m)可知,测槽末端宽度bL=8m。起始断面宽度与测槽末端宽度b0/bL采用0.5值，那么起始断面宽度b0=4m。测槽末端水深hL=(1.2-1.5)控制断面水深hk。hk=q=/(s.m)1代入数据得hk===3.4m.又查资料可知道bL/bO=5时hL=1.5hk。bL/bO=1时hL=1.2hk。而本设计中bL/bO=2，用内插法求得hL=1.275hk。hL=1.275hk。=1.275*3.4=4.3m。〔三〕确定控制断面坎高。控制断面坎高d=(hL-hk)+(1+()hL=4.3m。hk=3.4m.vL==3.44m/s。vk=代入数据得d=(4.3-3.4)+(1+()=-0.226m。由于d<0,故不设坎。注测槽断面采用梯形设计。m1=m2=0.5.〔四〕计算各断面流量。将测槽沿程划分假设干计算段，从起始段断面起骗号〔1,2,3,4,5,6〕计算各断面流量Qi=q*i.i=L/6=34.21/5=6.842m。q=Q/L=150/34.21=4.38m3/(s.m)那么Q1=0m/sQ2=4.38*6.842=29.9592m/sQ3=4.38*(6.842*2)=59.9184m/sQ4=4.38*(6.842*3)=89.8776m/sQ5=4.38*(6.842*4)=119.8368m/sQ6=4.38*(6.842*5)=149.796m/s(五)测槽水面曲线计算。根据公式:hi=hi+1+△y-i0△Xiy=[〔V2-V1〕++J△X]分别算出6个断面的底宽。b1=4m，b6=8m。采用内插法算出b2b3b4b5。算出b2。=4.8m.b3=5.6m,b4=6.4m,b5=7.2m.以第六和第五断面为分析。由上解知道vL=3.44m/s。那么v6=3.44m/s。V5==h5=h6+△y-0.1*6.842先假设△y=1。可以算出h5值来。再把h5值代入公式y=[〔V2-V1〕++J△X]中来验算△y值。改动△y=1值，使验算△y值和假设假设△y值相同接近，查看得h5=3.9058m.试算表格如下：5-6断面h5b5A5X5R5Q5V53.90587.235.749415.933632.243644119.83683.3521353.91587.235.860515.955992.247463119.83683.3417493.94587.236.1944316.023082.258894119.83683.3109183.97587.236.5292516.090162.270285119.83683.2805713.95587.236.3059416.045442.262695119.83683.300749h6b6A6X6R6Q6V64.3843.64517.615092.477705149.7963.4321464.3843.64517.615092.477705149.7963.4321464.3843.64517.615092.477705149.7963.4321464.3843.64517.615092.477705149.7963.4321464.3843.64517.615092.477705149.7963.432146(v5+v6)/2gv5+v6v6-v5Q6-Q5Q6+Q5V〔56平均〕R〔56平均〕J0.345783926.7842810.08001129.9592269.63283.39214032.3606742410.0010580.345254566.7738950.09039729.9592269.63283.3869472752.3625838240.0010540.343683196.7430640.12122729.9592269.63283.3715320562.3682993190.0010410.342136426.7127170.15157529.9592269.63283.3563582592.3739951230.0010280.343164896.7328950.13139629.9592269.63283.3664475722.3702000960.001036△y△y(验证〕0.290.295560.30.2982760.330.3062810.360.3140780.340.3089034-5断面h4b4A4X4R4Q4V43.63166.429.836514.52052.05478489.87763.0123373.92166.432.7877115.168962.161589.87762.7411983.52166.428.7390714.274542.0133189.87763.1273663.62166.429.7362314.498142.05103789.87763.0224943.57166.429.236414.386342.03223489.87763.074167h5b5A5X5R5Q5V53.90587.235.749415.933632.243644119.83683.3521353.90587.235.749415.933632.243644119.83683.3521353.90587.235.749415.933632.243644119.83683.3521353.90587.235.749415.933632.243644119.83683.3521353.90587.235.749415.933632.243644119.83683.352135(v4+v5)/2gv4+v5v5-v4Q5-Q4Q5+Q4V〔45平均〕R〔45平均〕J0.324386966.3644720.33979829.9592209.71443.1822360952.1492137720.0010550.31056746.0933320.61093729.9592209.71443.0466662252.2025717140.0009360.330249796.4795010.22476929.9592209.71443.2397504282.1284769880.0011080.324904656.3746290.3296429.9592209.71443.1873146642.1473404420.001060.327538356.4263020.27796729.9592209.71443.2131511762.137938570.001083△y△y(验证〕0.410.4123810.70.4664830.30.3875030.40.4102310.350.3991523-4断面h3b3A3X3R3Q3V33.41745.624.9767513.241541.88624259.91842.3989673.34745.624.3479813.085011.86075359.91842.4609183.44745.625.2477213.308621.89709559.91842.373223.54745.626.1574613.532231.93297559.91842.2906813.64745.627.077213.755831.96841659.91842.212873h4b4A4X4R4Q4V43.63166.429.836514.52052.05478489.87763.0123373.63166.429.836514.52052.05478489.87763.0123373.63166.429.836514.52052.05478489.87763.0123373.63166.429.836514.52052.05478489.87763.0123373.63166.429.836514.52052.05478489.87763.012337(v3+v4)/2gv3+v4v4-v3Q4-Q3Q4+Q3V〔34平均〕R〔34平均〕J0.275805525.4113040.6133729.9592149.7962.7056521091.9705131530.0008560.278963085.4732560.55141929.9592149.7962.7366278491.9577686360.0008840.274493235.3855570.63911729.9592149.7962.6927786141.9759396730.0008450.270286355.3030180.72165629.9592149.7962.6515090721.9938796830.000810.266320585.225210.79946529.9592149.7962.6126049292.0115999290.000777△y△y(验证〕0.470.4735240.40.4652390.50.4768760.60.487260.70.4965452-3断面h2b2A2X2R2Q2V23.17324.820.2659611.895491.70366729.95921.4783024.17324.828.7391614.131562.03368629.95921.0424525.17324.838.2123616.367632.3346329.95920.7840196.17324.848.6855618.603692.61698329.95920.6153617.17324.860.1587620.839762.8867329.95920.498002h3b3A3X3R3Q3V33.41745.624.9767513.241541.88624259.91842.3989673.41745.624.9767513.241541.88624259.91842.3989673.41745.624.9767513.241541.88624259.91842.3989673.41745.624.9767513.241541.88624259.91842.3989673.41745.624.9767513.241541.88624259.91842.398967(v2+v3)/2gv2+v3v3-v2Q3-Q2Q3+Q2V〔23平均〕R〔23平均〕J0.197618173.8772690.92066529.959289.87761.9386342591.7949548460.0004980.175403623.4414191.35651529.959289.87761.7207095591.9599643860.0003490.162231683.1829851.61494829.959289.87761.5914927492.1104363820.000270.153635483.0143281.78360629.959289.87761.5071640112.2516128470.0002220.147653882.8969691.90096529.959289.87761.44848462.3864859610.00019△y△y(验证〕0.440.4407531.440.4415372.440.4359733.440.4299164.440.4245691-2断面h1b1A1X1R1Q1V12.709414.5053410.057511.44224002.789415.0452610.236391.469781002.889415.7291610.461.503744002.989416.4230610.683611.537221003.089417.1269610.907211.57024200h2b2A2X2R2Q2V23.17324.820.2659611.895491.70366729.95921.4783023.17324.820.2659611.895491.70366729.95921.4783023.17324.820.2659611.895491.70366729.95921.4783023.17324.820.2659611.895491.70366729.95921.4783023.17324.820.2659611.895491.70366729.95921.478302(v1+v2)/2gv1+v2v2-v1Q2-Q1Q2+Q1V〔12平均〕R〔12平均〕J0.075346671.4783021.47830229.959229.95920.7391508051.5729536588.63E-050.075346671.4783021.47830229.959229.95920.7391508051.5867243418.53E-050.075346671.4783021.47830229.959229.95920.7391508051.6037055498.41E-050.075346671.4783021.47830229.959229.95920.7391508051.6204439358.3E-050.075346671.4783021.47830229.959229.95920.7391508051.6369544318.18E-05△y△y(验证〕0.220.2233610.30.2233540.40.2233460.50.2233380.60.22333由表格试算结果可以知道H1=2.709mh2=3.1732mh3=3.4174mh4=3.6316mh5=3.9058mh6=4.3m〔六〕泄槽计算。泄槽底宽为8m,采用矩形设计，边坡i=1/4=0.25，泄槽水平投影长约65m。糙率n查水力学资料p136表6-3取n=0.012.采用分段求和法求各断面水深列表如下：泄槽水面线计算过程及结果断面系号h(m)A(m2)X〔m)RCVj123456783.427.214.81.83783892.229525.5147060.001945324141.71428691.165946.250.0027422.419.212.81.589.159437.81250.0051192.217.612.41.41935588.3428.5227270.006557216121.33333387.426269.3750.0086241.814.411.61.24137986.391210.416670.0117121.612.811.21.14285785.2087311.718750.016551.411.210.81.03703783.8399713.392860.0246071.29.610.40.92307782.2290115.6250.0391160.99867.98889.99720.79910480.2760418.776290.068461V^2/2gEs△EsJi-J△L∑△L91011121314151.550054.950051.9909534.9909530.0409030.0023430.2476570.1651610.1651613.1108645.5108640.5199110.003930.246072.112862.2780213.7021865.9021860.3913210.0058380.2441621.6027123.8807324.4796446.4796440.5774590.0075910.2424092.3821666.2628995.5304257.3304250.8507810.0101680.2398323.5474019.81036.9994458.5994451.2690190.0141310.2358695.38018315.190489.14213210.542131.9426870.0205780.2294228.46775823.6582412.4434613.643463.1013250.0318610.21813914