冲刷深度计算(新计算)

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流量河宽断面间距累计距离位能水深断面面积流速流速水头总水头湿周QbLLZhωvv2/2gE2=Z2+v2/2gx(m3/s)(m)(m)(m)(m)(m)(m)(m2)(m/s)(m)(m)(m)1横37113065.001310.440.000.001315.585.14334.13.40.58375.32横36113057.201310.6054.8354.831315.534.93282.04.00.8181316.3567.13横3625060.001310.6054.8354.831315.534.93295.80.80.0361315.5769.9注:37#断面洪水位:1315.58(按矩形断面计算)序号横断面深泓线高程水力半径R2/3流量模数坡能河段平均坡能沿程水头损失局部水头损失E1=z1+v2/2g+hf+hj设计洪水位RK=(ω*R2/3)/nJhfhj(m)(m3/s)(m)(m)(m)4.4382.70#############1316.354.2052.61###################0.1900#REF!4.2342.62###################0.1190#REF!注:37#断面洪水位:1315.58(按矩形断面计算)参考资料《城市防洪工程设计规范》(CJJ50-92)《防洪标准》(GB50201-94)《堤防工程设计规范》(GB50286-98)1、护岸冲刷深度计算依据《堤防工程设计规范》(GB50286—98)①顺坝及平顺护岸冲刷深度计算:式中:hS—局部冲刷深度(m);Hp—冲刷处的水深(m);Ucp—近岸垂线平均流速(m/s);UC—泥沙的启动流速(m/s);粘性与沙质河床采用张瑞瑾公式计算,卵石n—与防护岸坡在平面上的形状有关,一般取n=1/4-1/6.河床采用长江科学院公式计算;d50—河床的中值粒径(m);H0—行进水流水深(m);rs,r分别为泥沙与水的重度(KN/m3),g为重力加速度(m/s2).Ucp的计算应符合下列规定:式中:U—行近流速(m/s);η—水流流速分配不均匀系数,根据水流流向与岸坡交角α角查表采用。河流名称及分段断面位置冲刷处的水深Hp(m)平均流速U(m/s)泥沙启动流速UC(m/s)系数n(rs-r)/rd50H0局部冲刷深度hB(m)平均流速Ucp(m/s)水流流速不均匀系数η水流方向与岸坡夹角α1#断面6.610.4730.910.201.600.00636.62-0.8170.4731.00《15℃②弯道凹岸冲刷深度采用水流斜冲计算公式计算河流名称及分段断面位置冲刷处的水深Hp(m)平均流速U(m/s)允许不冲流速UC(m/s)系数n(rs-r)/rd50H0局部冲刷深度hB(m)平均流速Ucp(m/s)水流流速不均匀系数η水流方向与岸坡夹角α5.013.071.110.241.080.02005.491.6733.6841.506.552.11.140.241.080.02006.771.3692.5201.505.611.541.120.241.080.02005.730.8121.9601.755.291.81.110.241.080.02005.461.0082.2911.755.31.731.110.241.080.02005.451.0202.3072.005.371.991.110.241.080.02005.571.2482.6532.00结论:防洪堤基础冲刷深度平顺段及凸岸段设计值取1.5m,凹岸斜冲段设计值取2m.白龙江杜坝段河道冲刷深度计算书河道平顺段冲刷深度计算表水流斜冲岸坡冲刷深度计算表(右岸)>15℃10nccpsUUHh12UUcp7/15005008.1dHrrrgdUsc参考资料《城市防洪工程设计规范》(CJJ50-92)《防洪标准》(GB50201-94)《堤防工程设计规范》(GB50286-98)1、护岸冲刷深度计算依据《堤防工程设计规范》(GB50286—98)①顺坝及平顺护岸冲刷深度计算:式中:hS—局部冲刷深度(m);Hp—冲刷处的水深(m);Ucp—近岸垂线平均流速(m/s);UC—泥沙的启动流速(m/s);粘性与沙质河床采用张瑞瑾公式计算,卵石n—与防护岸坡在平面上的形状有关,一般取n=1/4-1/6.河床采用长江科学院公式计算;d50—河床的中值粒径(m);H0—行进水流水深(m);rs,r分别为泥沙与水的重度(KN/m3),g为重力加速度(m/s2).Ucp的计算应符合下列规定:式中:U—行近流速(m/s);η—水流流速分配不均匀系数,根据水流流向与岸坡交角α角查表采用。河流名称及分段断面宽度(m)冲刷处的水深Hp(m)平均流速U(m/s)泥沙启动流速UC(m/s)系数n(rs-r)/r606.610.4730.910.201.6086.611.360.920.201.60106.611.270.920.201.60126.611.190.920.201.60白龙江杜坝段河道冲刷深度计算书河道平顺段冲刷深度计算表(卵石)桥头10nccpsUUHh12UUcp河流名称及分段断面宽度(m)冲刷处的水深Hp(m)平均流速U(m/s)泥沙启动流速UC(m/s)系数n(rs-r)/r计算流量304.51.330.850.201.04桥头3计算流量306.611.480.900.201.04桥头2.5设计流量306.611.50.900.201.0432.56.610.7220.830.200.89356.610.690.830.200.8937.56.610.660.830.200.89406.610.6330.830.200.89河流名称及分段断面宽度(m)冲刷处的水深Hp(m)平均流速U(m/s)泥沙启动流速UC(m/s)系数n(rs-r)/r计算流量304.51.330.920.200.92二郎庙3计算流量305.991.40.960.200.92二郎庙2.5设计流量305.991.420.960.200.9232.55.990.7220.960.200.92355.990.690.960.200.9237.55.990.660.960.200.92405.990.6330.960.200.92二郎庙UC—泥沙的启动流速(m/s);粘性与沙质河床采用张瑞瑾公式计算,卵石rs,r分别为泥沙与水的重度(KN/m3),g为重力加速度(m/s2).η—水流流速分配不均匀系数,根据水流流向与岸坡交角α角查表采用。d50H0局部冲刷深度hB(m)平均流速Ucp(m/s)水流流速不均匀系数η水流方向与岸坡夹角α0.00636.62-0.8170.4731.00《15℃0.00636.700.5431.3601.00《15℃0.00636.690.4461.2701.00《15℃0.00636.680.3551.1901.00《15℃白龙江杜坝段河道冲刷深度计算书河道平顺段冲刷深度计算表(卵石)桥头d50H0局部冲刷深度hB(m)平均流速Ucp(m/s)水流流速不均匀系数η水流方向与岸坡夹角α0.00634.590.5231.4781.2530°0.00636.720.6921.4801.0015°0.00636.720.7111.5001.0030°0.00636.640.0580.8661.5030°0.00636.63-0.0030.8281.5030°0.00636.63-0.0610.7921.5030°0.00636.63-0.1150.7601.5030°d50H0局部冲刷深度hB(m)平均流速Ucp(m/s)水流流速不均匀系数η水流方向与岸坡夹角α0.00934.590.6991.9002.5070°0.00936.090.9462.0002.5070°0.00936.090.9662.0292.5070°0.00936.020.0881.0312.5070°0.00936.010.0330.9862.5070°0.00936.01-0.0200.9432.5070°0.00936.01-0.0700.9042.5070°二郎庙

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