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三向地震作用下错距岩质边坡共振特性研究

林峻岑 严松宏 孙纬宇 欧尔峰

林峻岑,严松宏,孙纬宇,等. 三向地震作用下错距岩质边坡共振特性研究[J]. 水文地质工程地质,2022,50(0): 1-8 doi:  10.16030/j.cnki.issn.1000-3665.202206038
引用本文: 林峻岑,严松宏,孙纬宇,等. 三向地震作用下错距岩质边坡共振特性研究[J]. 水文地质工程地质,2022,50(0): 1-8 doi:  10.16030/j.cnki.issn.1000-3665.202206038
LIN Juncen, YAN Songhong, SUN Weiyu, et al. A study of the resonance characteristics of a staggered rock slope under the tri-dimension earthquake wave[J]. Hydrogeology & Engineering Geology, 2022, 50(0): 1-8 doi:  10.16030/j.cnki.issn.1000-3665.202206038
Citation: LIN Juncen, YAN Songhong, SUN Weiyu, et al. A study of the resonance characteristics of a staggered rock slope under the tri-dimension earthquake wave[J]. Hydrogeology & Engineering Geology, 2022, 50(0): 1-8 doi:  10.16030/j.cnki.issn.1000-3665.202206038

三向地震作用下错距岩质边坡共振特性研究

doi: 10.16030/j.cnki.issn.1000-3665.202206038
基金项目: 国家自然科学基金(52068044;52168058;52208392);甘肃省自然科学基金(21JR7RA309);中国博士后科学基金(2021M693843)
详细信息
    作者简介:

    林峻岑(1998-),男,硕士研究生,主要从事隧道抗震研究工作。E-mail:1753106300@qq.com

    通讯作者:

    孙纬宇(1988-),男,博士,讲师,主要从事隧道与地下工程的教学与研究工作。E-mail:448221362@qq.com

  • 中图分类号: P315.9

A study of the resonance characteristics of a staggered rock slope under the tri-dimension earthquake wave

  • 摘要: 地震引发的共振往往会对边坡造成更严重的破坏,直接影响其抗震性能。为研究错距岩质边坡的共振特性,通过有限元软件ANSYS建立三维边坡数值模型,分析了错距对边坡固有频率的影响,并使用谐响应分析对坡面各点的共振响应规律及地震作用频率对边坡应力的影响进行了探讨。结果表明:(1)边坡错距越大,基频越小,在不同错距条件下均有可能出现共振现象,坡面的水平共振位移大于竖向共振位移,前坡坡面位移峰值较大,发生共振的频率比后坡小;(2)低阶和高阶固有频率被激发都可引发共振,但高阶共振位移相对较小,前坡和后坡坡面水平位移峰值表现为:坡顶>坡中>坡脚,侧坡则是:坡中>坡顶>坡脚,在高频加载条件下,边坡会出现下部动力响应大于上部的现象;(3)坡体共振时发生的破坏主要以坡脚剪切破坏为主,最大剪切应力和最大拉应力出现的位置与加载频率范围有关,前坡更容易遭受破坏,低频地震动对前坡影响更大,而高频地震动则相反。所得结论可为错距边坡进行抗震设防时确定重点加固部位提供参考。
  • 图  1  三维边坡有限元模型

    Figure  1.  3D finite element model of slope

    图  2  不同错距边坡前14阶固有频率

    Figure  2.  The first 14 natural frequencies of slopes with different staggered distances

    图  3  坡面监测点布置

    Figure  3.  Layout of the slope monitoring points

    图  4  Z向位移谐响应曲线

    Figure  4.  Displacement harmonic response curves in the Z direction

    图  5  X向位移谐响应曲线

    Figure  5.  Displacement harmonic response curves in the X direction

    图  6  坡面共振位移峰值

    Figure  6.  Peak of slope resonance displacement

    图  7  不同加载频率应力云图(单位:MPa)

    Figure  7.  Stress nephograms of different loading frequencies (unit: MPa)

    表  1  边坡岩体物理力学参数

    Table  1.   Physical and mechanical parameters of slope rock mass

    弹性模量/GPa泊松比密度/(kg·m−3
    岩体6.00.252200
    下载: 导出CSV

    表  2  计算模型

    Table  2.   Calculation models

    模型编号 12345
    错距/m0204060100
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-06-18
  • 录用日期:  2022-10-27
  • 修回日期:  2022-10-12
  • 网络出版日期:  2022-11-14

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