[1]杨 乾,杨庆华*,姚锦涛,等.山地河流穿越管道冲坑扩展规律的试验研究[J].山地学报,2020,(02):241-251.[doi:10.16089/j.cnki.1008-2786.000506]
 YANG Qian,YANG Qinghua*,YAO Jintao,et al.Experimental Study in Expansion Law of Scour Hole of Pipeline Crossing Mountain River[J].Mountain Research,2020,(02):241-251.[doi:10.16089/j.cnki.1008-2786.000506]
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山地河流穿越管道冲坑扩展规律的试验研究()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2020年02期
页码:
241-251
栏目:
山地灾害
出版日期:
2020-03-30

文章信息/Info

Title:
Experimental Study in Expansion Law of Scour Hole of Pipeline Crossing Mountain River
文章编号:
1008-2786-(2020)2-241-11
作者:
杨 乾杨庆华*姚锦涛张宇倩王子聪
西南交通大学 土木工程学院,成都 610031
Author(s):
YANG Qian YANG Qinghua* YAO Jintao ZHANG Yuqian WANG Zicong
School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China
关键词:
水下穿越管道 冲坑 扩展速率 冲刷深度 水槽试验
分类号:
TV147+.5
DOI:
10.16089/j.cnki.1008-2786.000506
文献标志码:
A
摘要:
合理预测山地河流穿越管道的未来埋深和悬空长度对其安全运营至关重要。本文以北干线输气管道穿越工程为研究对象开展了水槽模型试验,观测分析河流穿越管道附近河床演变趋势,研究流量、水深和管径等因素对冲坑扩展规律的影响。结果表明:河床演变主要由推移质泥沙输移引起,而随着管径的增大,在管底形成冲坑点的次数逐渐减少; 管底形成冲刷之时冲坑竖向扩展速率很大,随着管涌的发生,冲刷速率逐渐减小,冲刷深度逐渐增大; 管底冲坑竖向扩展过程满足一级动力学反应方程,归一化处理后得到了冲刷深度与冲刷时间之间关系式; 水动力条件、管径和沙粒特性共同影响管底极限冲刷深度,采用Gauss-Seidel迭代法得到无量纲冲刷深度与相对泥沙粒径和弗劳德数Fr参数的关系式; 当Fr>0.6时,冲坑横向扩展仅为初级扩展一个阶段,当Fr<0.6时,冲坑横向扩展过程包含初级扩展和次级扩展两阶段; 最后,结合试验数据和冲坑竖向扩展经验模型,推导出冲坑横向扩展速率计算公式,且模型预测结果较好。研究结果可为探究山地河流穿越管道冲坑扩展规律及管道后期安全运营维护提供重要参考价值。

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备注/Memo

备注/Memo:
收稿日期(Received date):2019-12-30; 改回日期(Accepted date): 2020-03-04
基金项目(Foundation item):国家自然科学基金项目(51478403)。 [National Natural Science Foundation of China(51478403)]
作者简介(Biography):杨乾(1990-),男,甘肃天水人,博士研究生,从事水动力学与泥沙研究。 [YANG Qian(1990-),male,born in Tianshui,Gansu province,Ph. D. candidate,research on hydrodynamics and sediment] E-mail: yangqian-swjtu@foxmail.com
*通讯作者(Corresponding author):杨庆华(1976-),男,博士,副教授,从事流体力学研究。[YANG Qinghua(1976-),male,Ph. D.,associate professor,research on fluid mechanics] E-mail: qhyang@home.swjtu.edu.cn
更新日期/Last Update: 2020-03-30