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碎屑流冲击下桩梁组合结构拦挡效果及受力特征研究

王文沛 殷跃平 胡卸文 李滨 刘明学 祁小博

王文沛, 殷跃平, 胡卸文, 等, 2022. 碎屑流冲击下桩梁组合结构拦挡效果及受力特征研究. 地质力学学报, 28 (6): 1081-1089. DOI: 10.12090/j.issn.1006-6616.20222834
引用本文: 王文沛, 殷跃平, 胡卸文, 等, 2022. 碎屑流冲击下桩梁组合结构拦挡效果及受力特征研究. 地质力学学报, 28 (6): 1081-1089. DOI: 10.12090/j.issn.1006-6616.20222834
WANG Wenpei, YIN Yueping, HU Xiewen, et al., 2022. Effectiveness and mechanical characteristics of a pile-beam composite structure in blocking debris flows. Journal of Geomechanics, 28 (6): 1081-1089. DOI: 10.12090/j.issn.1006-6616.20222834
Citation: WANG Wenpei, YIN Yueping, HU Xiewen, et al., 2022. Effectiveness and mechanical characteristics of a pile-beam composite structure in blocking debris flows. Journal of Geomechanics, 28 (6): 1081-1089. DOI: 10.12090/j.issn.1006-6616.20222834

碎屑流冲击下桩梁组合结构拦挡效果及受力特征研究

doi: 10.12090/j.issn.1006-6616.20222834
基金项目: 

国家重点研发计划资助项目 2022YFC3004301

国家重点研发计划资助项目 2018YFC1505404

甘肃省自然资源厅重点科学技术研究项目 2021-001

中国地质调查局地质调查项目 DD20221748

详细信息
    作者简介:

    王文沛(1985—), 男, 博士, 正高级工程师, 主要从事地质灾害防治工作。E-mail: jcywangwenpei@mail.cgs.gov.cn

    通讯作者:

    祁小博(1978—), 女, 硕士, 高级工程师, 主要从事地质灾害调查工作。E-mail: 527672432@qq.com

  • 中图分类号: U443.15

Effectiveness and mechanical characteristics of a pile-beam composite structure in blocking debris flows

Funds: 

the National Key R&D Program of China 2022YFC3004301

the National Key R&D Program of China 2018YFC1505404

the Key Science and Technology Program of Gansu Provincial Department of Natural Resources 2021-001

the Geological Survey Project of the China Geological Survey DD20221748

  • 摘要:

    以高位泥石流、碎屑流区桩梁组合新型拦挡结构为研究对象, 在总结已有桩梁组合结构的基础上, 运用颗粒流分析仿真程序、通用显示动力分析程序分别对碎屑流冲击下单排、多排桩林及桩梁组合结构拦挡效果、不同位置桩梁组合结构拦挡效果对比模拟以及桩梁组合结构受力特征模拟研究, 探讨了拦挡结构阻挡后碎屑流堆积特征和结构应力传递特征。计算结果表明: 碎屑流中较大粒径颗粒与拦挡结构、两侧沟道边界接触形成的桩-巨石力链拦挡效应可有效阻挡、迟滞后续碎屑流运动, 桩梁组合结构桩-巨石力链拦挡效应最佳; 第一排桩和第二排桩之间改流区进一步抑制了碎屑流速度; 桩梁组合结构在设计布置位置时, 一方面要考虑在碎屑流启动、势动转换过程中尽早抑制碎屑流速度, 另一方面仍需重视库容的设计, 谨防跃顶造成部分碎屑流逃逸, 在上述二者之间选择最优解进行位置布置; 碎屑流巨石冲击桩梁组合结构时, 冲击应力将通过连梁分散传递到后排桩, 连系梁两端连接部分的应力几乎达到屈服强度, 需加强配筋。

     

  • 图  1  桩梁组合结构

    Figure  1.  Photos of pile-beam composite structures

    图  2  理想碎屑流拦挡结构布局

    Figure  2.  Layout of blocking piles in an idealized avalanche zone

    图  3  理想碎屑流不同结构拦挡效果对比图

    Figure  3.  Comparison diagrams showing the blocking effectiveness of different blocking structures

    图  4  理想碎屑流区不同位置桩梁组合结构拦挡效果对比图

    Figure  4.  Comparison diagrams showing the blocking effectiveness of a pile-beam composite structure laid out in different positions

    图  5  碎屑流巨石撞击桩梁组合结构模型图

    Figure  5.  Model diagram showing a pile-beam composite structure impacted by a debris flow boulder

    图  6  桩梁拦挡组合结构混凝土等效应力图

    Figure  6.  Von-Mises stress of the pile-beam composite structure

    图  7  桩梁拦挡组合结构钢筋应力

    Figure  7.  Steel stress of the pile-beam composite structure

    表  1  碎屑流及拦挡结构几何参数

    Table  1.   Geometric parameters for the blocking structures and the debris flow

    名称 符号 对应值
    初始碎屑流滑体宽度/m a 30
    初始碎屑流滑体长度/m b 40
    初始碎屑流滑体厚度/m c 10
    初始碎屑流所在斜坡转角处与拦挡结构前缘距离/m d 60
    初始碎屑流所在斜坡投影长度/m L1 43
    碎屑流运动堆积区长度/m L2 81
    碎屑流运动堆积区宽度/m M 32
    初始碎屑流所在斜坡转角/(°) β 30
    拦挡结构高度/m h 12
    工况1桩间间距/m n1 5.5
    工况2—工况4桩间间距/m n2 3
    下载: 导出CSV

    表  2  碎屑流及拦挡结构参数

    Table  2.   Dynamic coefficient of the blocking structures and the debris flow

    名称 对应值
    恢复系数 0.3
    静力摩擦系数 0.2
    滚动摩擦系数 0.01
    碎屑流颗粒密度/(kg·m-3) 2600
    碎屑流颗粒弹性模量/GPa 50
    下载: 导出CSV

    表  3  结构与滚石基本参数

    Table  3.   Basic parameters of the pile-beam composite structure and the boulder

    参数 密度/
    (kg·m-3)
    弹模/
    GPa
    泊松比 屈服应力/
    MPa
    失效应变
    混凝土 2314 35 0.2 30 0.1
    钢筋 7800 200 0.3 400 0.2
    碎屑流巨石 2600 50 0.16
    下载: 导出CSV
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  • 收稿日期:  2022-06-24
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