| 杨开林.复合管道水击波速的计算[J].水利学报,2025,56(6):705-716 |
| 复合管道水击波速的计算 |
| Calculation of water hammer velocity in composite pipelines |
| 投稿时间：2024-07-20 |
| DOI：10.13243/j.cnki.slxb.20240460 |
| 中文关键词: 复合管道 水击波速 应变率 厚壁管道 薄壁管道 隧洞 |
| 英文关键词: composite pipe water hammer wave velocity strain rate thick-wall pipe thin-wall pipe tunnel |
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| 中文摘要: |
| 水击波速是计算管道水击压力的关键参数,复合管道水击波速的准确计算是一个亟需解决的科学问题。本文根据水击波速的原始定义,建立了水击波速与管道内壁周向应变率的函数关系,以及周向应变率与周向、径向和轴向应力变化率的函数关系。在此基础上,考虑复合管各层应变率、交界面压力、管材力学参数和结构尺寸等的相互影响,提出了准确计算复合管水击波速的通用公式。通过对影响通用公式各因素的解析,导出薄壁复合管（包括薄壁衬砌隧洞和地下埋管）水击波速的近似公式,然后分析了传统复合管水击波速公式存在的问题及适用条件。最后,通过算例证明：（1）对于含有厚壁层的复合管道,应该采用准确计算水击波速的通用公式；（2）传统的复合管道水击波速公式仅适用于薄壁复合管；（3）PCCP管的水击波速在945~1184 m/s之间；（4）当管道地下铺设时,受回填土的影响,管道水击波速略微增加,影响较小。 |
| 英文摘要: |
| The water hammer velocity is a key parameter for calculating pipeline water hammer pressure, and the accurate calculation of water hammer velocity in composite pipes is an urgent scientific problem that needs to be solved. According to the original definition of water hammer wave velocity, the functional relationship between water hammer wave velocity and circumferential strain rate on the inner wall of the pipeline, as well as the functional relationship between circumferential strain rate and circumferential, radial, and axial stress change rates, have been established. On this basis, considering the mutual influence of strain rate, interfacial pressure, pipe mechanical parameters, and structural dimensions of composite pipes, a general formula for accurately calculating the water hammer wave velocity in composite pipes is proposed. Then, by analyzing the factors that affect the general formula, the approximate formulas for the water hammer wave velocity of thin-walled composite pipes are derived, including thin-walled lining tunnels and underground buried pipes. The problems and applicable conditions of the traditional formula for water hammer wave velocity in composite pipes are analyzed. Finally, it is demonstrated through numerical examples that： （1） for composite pipelines with thick wall layers, the general formula for accurately calculating water hammer velocity should be used； （2） The traditional formulas for water hammer velocity in composite pipelines are only applicable to thin-walled composite pipes； （3） The water hammer velocity of PCCP pipes is between 945 and 1184 m/s； （4） When the pipeline is laid underground, the wave velocity in the pipeline slightly increases due to the influence of backfill soil, and the impact is relatively small. |
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