运行工况下排水管道输水能力分析

Analysis on Water Conveyance Capacity of Drainage Pipelines under Operating Conditions

摘要:

在城市更新与韧性城市建设背景下，现有排水管道设计多基于理想工况，未充分考量运行期糙率变化、管内积泥等运维因素，导致长期运行后输水能力下降。结合相关规范，通过理论分析与量化计算，系统研究核心运维因素对输水能力的影响。结果表明，运行工况下糙率升至0.018时输水能力下降22.22%，积泥厚度达d/5时降幅为7.23%~11.44%，两者叠加后最大降幅达42.68%。基于此，提出管道输水能力0.9~0.6的运行折减系数，为城市更新管网优化与韧性排水系统构建提供支撑。

Abstract:

Under the context of urban renewal and resilient city construction, the existing drainage pipe designs are mostly based on ideal conditions and do not fully consider operation and maintenance factors such as roughness changes and sediment accumulation during the service life, leading to a decrease in water conveyance capacity over time. In combination with relevant norms, through theoretical analysis and quantitative calculation, the influence of core operation and maintenance factors on water conveyance capacity is systematically studied. The results show that when the roughness rises to 0.018 during operation, the water conveyance capacity decreases by 22.22%, and when the sediment thickness reaches d/5, the decrease ranges from 7.23% to 11.44%. When both factors are combined, the maximum reduction reaches 42.68%. Based on this, an operational reduction coefficient of 0.9~0.6 for pipeline water conveyance capacity is proposed, providing support for pipeline network optimization of urban renewal and the construction of resilient drainage systems.