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压力型锚杆支护滑坡的地震动力响应特性研究

李楠 汪班桥 门玉明 张妙芝

李楠, 汪班桥, 门玉明, 等, 2018. 压力型锚杆支护滑坡的地震动力响应特性研究. 地质力学学报, 24 (4): 490-497. DOI: 10.12090/j.issn.1006-6616.2018.24.04.051
引用本文: 李楠, 汪班桥, 门玉明, 等, 2018. 压力型锚杆支护滑坡的地震动力响应特性研究. 地质力学学报, 24 (4): 490-497. DOI: 10.12090/j.issn.1006-6616.2018.24.04.051
LI Nan, WANG Banqiao, MEN Yuming, et al., 2018. STUDY ON DYNAMIC RESPONSE OF LANDSLIDE SUPPORTED BY PRESSURE-TYPE ANCHOR UNDER EARTHQUAKE. Journal of Geomechanics, 24 (4): 490-497. DOI: 10.12090/j.issn.1006-6616.2018.24.04.051
Citation: LI Nan, WANG Banqiao, MEN Yuming, et al., 2018. STUDY ON DYNAMIC RESPONSE OF LANDSLIDE SUPPORTED BY PRESSURE-TYPE ANCHOR UNDER EARTHQUAKE. Journal of Geomechanics, 24 (4): 490-497. DOI: 10.12090/j.issn.1006-6616.2018.24.04.051

压力型锚杆支护滑坡的地震动力响应特性研究

doi: 10.12090/j.issn.1006-6616.2018.24.04.051
基金项目: 

国家自然科学基金项目 41440021

国家自然科学基金项目 41572261

国家自然科学基金项目 41502277

中央高校基本科研业务费专项资金项目 310826175029

中央高校基本科研业务费专项资金项目 300102268209

中央高校基本科研业务费专项资金项目 310826171016

详细信息
    作者简介:

    李楠(1990-), 女, 在读博士, 主要从事滑坡治理及建筑安全研究。E-mail:linan1990111@163.com

    通讯作者:

    汪班桥(1977-), 女, 博士, 副教授, 主要从事滑坡治理研究。E-mail:dcdgx17@chd.edu.cn

  • 中图分类号: P642.22

STUDY ON DYNAMIC RESPONSE OF LANDSLIDE SUPPORTED BY PRESSURE-TYPE ANCHOR UNDER EARTHQUAKE

  • 摘要: 为研究地震作用下锚固滑坡的动力响应特征及压力型锚杆的受力机制,采用ABAQUS有限元软件建立了压力型锚杆联合格构梁支护的锚固滑坡模型,在此基础上,分析了锚固滑坡的加速度响应规律、地震动参数对加速度响应的影响以及压力型锚杆的受力特征等。结果表明:地震作用下锚固滑坡具有明显的高程放大效应,坡顶响应最强;不同类型的地震波作用时,由于其频谱特性的差异,锚固滑坡的加速度响应不同,锚固滑坡对输入地震波的低频段存在放大作用,对高频段具有滤波作用;随地震波幅值的增大,锚固滑坡的加速度响应呈先减小后增大的趋势。对于同一根锚杆而言,锚杆杆体轴力分布较均匀;对于同列不同排的锚杆而言,各排锚杆杆体的轴力值差异较大,自上而下呈"C"型分布,底排锚杆和顶排锚杆承担大部分荷载。研究结果对于压力型锚杆支护滑坡的抗震设计具有一定的指导意义。

     

  • 图  1  压力型锚杆结构示意图

    Figure  1.  The sketch map of a pressure anchor

    图  2  压力型锚杆联合格构梁支护滑坡

    Figure  2.  The landslide supported by anchor and lattice beam structure pressure-type

    图  3  计算模型

    Figure  3.  Calculation model of anchorage landslide

    图  4  输入地震波的加速度时程

    Figure  4.  Time-history of input seismic waves

    图  5  坡面测点PGA放大系数

    Figure  5.  PGA amplification coefficient of slope surface measuring points

    图  6  测点加速度傅里叶谱

    Figure  6.  Acceleration fourier spectrums of measuring points

    图  7  不同类型地震波作用下坡面测点PGA放大系数

    Figure  7.  PGA amplification coefficient of slope surface measuring points under different seismic waves

    图  8  不同幅值地震波作用下边坡测点PGA放大系数

    Figure  8.  PGA amplification coefficient of slope surface measuring points under different amplitudes

    图  9  不同时间压缩常数下滑坡测点PGA放大系数

    Figure  9.  PGA amplification coefficient of slope surface measuring points under earthquake in different time similitude constants

    图  10  底排锚杆杆体轴力峰值

    Figure  10.  Axial force peak values of the bottom anchor body

    图  11  各排锚杆的平均轴力峰值

    Figure  11.  Average axial force peak values of anchors at each layer

    表  1  锚固滑坡物理力学参数

    Table  1.   Physical mechanics parameters of anchorage landslide

    材料
    参数
    密度/
    (kg/m3)
    弹性模量/
    MPa
    泊松比 黏聚力/
    KPa
    内摩擦
    角/(°)
    阻尼比
    土体 2070 450 0.19 35.7 23.5 0.10
    格构 2430 2.5×104 0.2 - - 0.02
    杆体 7850 2.1×105 0.3 - - 0.02
    砂浆 1900 1.5×104 0.15 - - 0.02
    下载: 导出CSV

    表  2  地震荷载输入工况

    Table  2.   Information of input seismic waves

    工况 地震波类型 幅值/(m/s2) 时间压缩比 持时/s
    E-1 El Centro波 0.1g 1 30
    E-2 El Centro波 0.2g 1 30
    E-3 El Centro波 0.3g 1 30
    E-4 El Centro波 0.4g 1 30
    E-5 El Centro波 0.6g 1 30
    W-1 汶川波 0.3g 1 45
    K-1 Kobe波 0.3g 1 25
    K-2 Kobe波 0.3g 1.78 14
    K-3 Kobe波 0.3g 3.16 7.9
    下载: 导出CSV
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  • 收稿日期:  2018-01-09
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