雨水管道积泥及水力不确定性对过水能力的影响  

Effects of Silt and Hydraulic Uncertainty on Discharge Capacity of Storm Sewer

作　　者：张子贤[1] 刘家春[1] ZHANG Zi-xian;LIU Jia-chun(School of Building Intelligence,Jiangsu Vocational Institute of Architectural Technology,Xuzhou 221116,China)

机构地区：[1]江苏建筑职业技术学院建筑智能学院,江苏徐州221116

出　　处：《中国给水排水》2021年第15期115-120,共6页China Water & Wastewater

基　　金：住房和城乡建设部科学技术项目(2015-K7-009)。

摘　　要：考察了雨水管道积泥及水力不确定性对其过水能力的影响,导出了管道积泥后过水能力变化率的计算式。计算表明,既有雨水管道在《城镇排水管渠与泵站运行、维护及安全技术规程》(CJJ 68—2016)允许的疏通前、后的积泥深度情况下,过水能力将分别下降20%以上和近15%。另外,分别导出了管径、糙率单独变化以及两者均变化时新建雨水管道过水能力变化率的计算式。计算表明,对管径为100~1 500 mm的新建雨水管道,在《混凝土和钢筋混凝土排水管》(GB/T 11836—2009)规定的管径允许负偏差情况下,相应过水能力的变化率为-19.9%~-1.8%;当管径的允许负偏差与糙率的常见变化或与管道允许积泥深度组合出现时,均将使过水能力下降的幅度更大,最大值达40%。上述结果表明,按现行的水力设计方法无法实现雨水管道的预期功能。因此,对既有雨水管道,建议减小允许积泥深度,并加强维护与管理;对新建雨水管道,建议修订管径的允许负偏差,并改进水力设计方法。Effects of silt and hydraulic uncertainty on the discharge capacity of storm sewer were investigated, and the formula for calculating the change rate of storm sewer discharge capacity after silt deposition was derived. Under the condition of the allowable silt depth before and after dredging in Technical Specification for Operation, Maintenance and Security of Sewers & Channels and Pumping Stations in City and Town(CJJ 68-2016), the discharge capacity of the existing storm sewer decreased by more than 20% and nearly 15%, respectively. The formulas for calculating the change rate of new storm sewer discharge capacity in the case of the diameter and roughness change separately and simultaneously were derived, respectively. For new storm pipes with diameter of 100-1 500 mm, the change rate of the corresponding discharge capacity was between-19.9% and-1.8% under the condition of allowable negative deviation of pipe diameter stipulated in Concrete and Reinforced Concrete Sewer Pipes(GB/T 11836-2009). When the allowable negative deviation of pipe diameter combined with the common variation of roughness or the allowable pipe silt depth appeared, the decreasing range of the discharge capacity became larger, and the maximum value reached 40%. The results showed that the current hydraulic design method could not realize the expected function of storm sewer. Therefore, it was suggested to reduce the allowable silt depth and strengthen the maintenance and management for existing storm sewers, revise the allowable negative deviation of pipe diameter and improve the hydraulic design method for new storm sewers.

关 键 词：雨水管道 积泥深度 管径允许偏差 水力不确定性 过水能力 

分 类 号：TU992[建筑科学—市政工程]