1、倒虹吸計算一、基本參數(shù)過水流量渠道底寬渠道頂寬渠道縱坡上游底高程下游底高程糙率系數(shù)m3smmmm0.511.20.0010.03二、計算過程渠道內水深試算流量mm3s0.990.50擬選用管徑管斷面積管內水流速v22gmmm2ms8000.5030.9960.051水頭損失計算轉彎進口直角進口出口直角80800.4130.413局損系數(shù)0.5000.0510.7410.741小計局損0.0250.0030.0370.0370.103沿程

2、水頭損失謝才系數(shù)水力半徑糙率管材長度沿程水頭損失CR(m)nmm56.650.20.01351500.230水頭損失0.333故上游渠頂需比下游高50cm根據Q=μωsqrt(2gh)μ流量系數(shù)取0.85ω斷面積600管可過水0.5流量施工圖時取600砼管一、基本數(shù)據選用管材管重水重粘結力開挖寬度摩擦系數(shù)DNkg根kg根kgcm2m80022852513101.20.3進口側山體坡度需要砼管滑動力垂直山體力粘結力度根kgkgkg46.4