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银西高铁董志塬地区边坡侵蚀特性研究

夏万云

夏万云. 银西高铁董志塬地区边坡侵蚀特性研究[J]. 中国地质灾害与防治学报. doi: 10.16031/j.cnki.issn.1003-8035.202105039
引用本文: 夏万云. 银西高铁董志塬地区边坡侵蚀特性研究[J]. 中国地质灾害与防治学报. doi: 10.16031/j.cnki.issn.1003-8035.202105039
Wanyun XIA. Study on slope erosion characteristics in Dongzhiyuan plateau of Yinchuan-Xi'an High-speed Railway[J]. The Chinese Journal of Geological Hazard and Control. doi: 10.16031/j.cnki.issn.1003-8035.202105039
Citation: Wanyun XIA. Study on slope erosion characteristics in Dongzhiyuan plateau of Yinchuan-Xi'an High-speed Railway[J]. The Chinese Journal of Geological Hazard and Control. doi: 10.16031/j.cnki.issn.1003-8035.202105039

银西高铁董志塬地区边坡侵蚀特性研究

doi: 10.16031/j.cnki.issn.1003-8035.202105039
基金项目: 中国铁建“黄土溯源侵蚀机制及其对铁路工程影响研究”项目基金(股份公司科研开发项目14-C15)
详细信息
    作者简介:

    夏万云(1981-),男,高级工程师,主要从事铁路勘察设计方面的工作。Email:113497464@qq.com

  • 中图分类号: P642.2

Study on slope erosion characteristics in Dongzhiyuan plateau of Yinchuan-Xi'an High-speed Railway

  • 摘要: 黄土坡面侵蚀特性研究对于铁路边坡及路基防护具有重要的意义,通过银西高铁董志塬段某路基护坡坡面冲刷试验,获得了不同冲刷历时、冲刷流量、坡度等条件下的坡面冲刷结果,并对坡面流水动力学特性、坡面产沙规律、坡面产沙机理进行了分析,主要得出以下结论:(1)坡顶和坡底比坡面中部更易侵蚀;30°~60°斜坡在较小的冲刷强度下也能产生较明显的侵蚀沟,宜采取45°左右的多级矮坡来减弱侵蚀强度。(2)坡面流水动力学特性分析表明,试验工况水流主要处于过渡流区;平均流速与冲刷流量、坡度呈幂函数关系;达西阻力系数与冲刷流量、坡度呈负相关,且与雷诺数相关性较低。(3)平均含沙量随冲刷流量与坡度的增大而增大,随历时近似线性增加,约20 min以后,含沙量基本稳定,此过程为坡面沟道发展阶段。(4)坡面侵蚀产沙量与侵蚀切应力、有效水流功率都呈正相关,与前者近似呈线性增大关系,而与后者近似呈幂函数关系。
  • 图  1  坡面冲刷试验位置

    Figure  1.  Site of the scour experiment of loess slope

    图  2  冲刷试验示意图

    Figure  2.  Diagram of the scour experiment

    图  3  不同时长的坡面冲刷情况

    Figure  3.  Slope scour results in different time periods

    图  4  不同给水流量下的坡面冲刷情况

    Figure  4.  Slope scour results under different feed flow

    图  5  不同坡度下的坡面冲刷情况

    Figure  5.  Slope scour results at different slope angles

    图  6  平均流速与冲刷流量、坡度的关系

    Figure  6.  Relationship between average flow velocity and feed flow at different slope angles

    图  7  达西阻力系数与冲刷流量、坡度的关系

    Figure  7.  Relationship between average flow velocity and slope angles at different feed flow

    图  8  达西阻力系数与雷诺数的双对数关系

    Figure  8.  The log-log relationship between Darcy resistance coefficient and Reynolds number

    图  9  不同坡度下产泥沙率与冲刷流量的关系

    Figure  9.  Relationship between sediment yield rate and feed flow at different slope angles

    图  10  不同坡度下产泥沙率与冲刷历时的关系

    Figure  10.  Relationship between sediment yield rate and scour time at different slope angles

    图  11  坡面侵蚀切应力与含沙量关系

    Figure  11.  Relationship between scour shear stress and sediment yield rate on slope

    图  12  坡面有效水流功率与含沙量关系

    Figure  12.  Relationship between effective scour power and sediment yield rate on slope

    表  1  坡面冲沟水流雷诺数

    Table  1.   Reynolds number of gully flow on slope

    试验坡度(°)试验流量(L/min)
    1246
    9046668711001891
    6055679414322012
    456138558651922
    307858766331444
    下载: 导出CSV

    表  2  各工况下坡面冲刷剪切力

    试验坡度/°试验流量(L/min)
    1246
    300.3480.4240.5360.613
    450.8121.2011.451.561
    601.3451.8802.4852.554
    901.6512.0013.0313.974
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-05-17
  • 修回日期:  2021-08-12
  • 网络出版日期:  2021-09-09

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