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基于连续小波变换的斜坡动力响应特征分析

金刚 王运生 何先龙 史丙新 周宇航

金刚, 王运生, 何先龙, 史丙新, 周宇航. 2021: 基于连续小波变换的斜坡动力响应特征分析. 中国地质灾害与防治学报, 32(2): 1-8. doi: 10.16031/j.cnki.issn.1003-8035.2021.02.01
引用本文: 金刚, 王运生, 何先龙, 史丙新, 周宇航. 2021: 基于连续小波变换的斜坡动力响应特征分析. 中国地质灾害与防治学报, 32(2): 1-8. doi: 10.16031/j.cnki.issn.1003-8035.2021.02.01
Gang JIN, Yunsheng WANG, Xianlong HE, Bingxin SHI, Yuhang ZHOU. 2021: Time-Frequency characteristics and seismic response analyses of the 6.0-magnitude earthquake, Changning County of Yibin in Southwest China’s Sichuan Province. The Chinese Journal of Geological Hazard and Control, 32(2): 1-8. doi: 10.16031/j.cnki.issn.1003-8035.2021.02.01
Citation: Gang JIN, Yunsheng WANG, Xianlong HE, Bingxin SHI, Yuhang ZHOU. 2021: Time-Frequency characteristics and seismic response analyses of the 6.0-magnitude earthquake, Changning County of Yibin in Southwest China’s Sichuan Province. The Chinese Journal of Geological Hazard and Control, 32(2): 1-8. doi: 10.16031/j.cnki.issn.1003-8035.2021.02.01

基于连续小波变换的斜坡动力响应特征分析

doi: 10.16031/j.cnki.issn.1003-8035.2021.02.01
基金项目: 国家创新研究群体科学基金(41521002);国家自然科学基金(41877235)
详细信息
    作者简介:

    金刚:金 刚(1996-),男,河南郑州人,硕士研究生,从事地质工程与区域稳定性研究。Email:825200169@qq.com

    通讯作者:

    王运生(1960-),男,博士,博士生导师,主要从事工程地质方面的教学工作。Email:wangys60@163.com

  • 中图分类号: P694

Time-Frequency characteristics and seismic response analyses of the 6.0-magnitude earthquake, Changning County of Yibin in Southwest China’s Sichuan Province

  • 摘要: 川西北地区深切峡谷发育,地震扰动频繁。峡谷内高陡岩质斜坡在强震扰动下,通常会发生震裂松弛,进而导致失稳,因此研究其强震响应意义重大。2019年四川长宁Ms6.0级地震触发了布置在石棉县城南桠河两岸的3台强震监测仪器,通过对捕捉到的强震数据进行连续小波变换之后,获取了其时频信息。分析结果表明:(1)S波在频域上分为两种成分,其主频值分别为3.5 Hz和1.1 Hz附近;(2)山脊处的地震动放大效应主要体现为S波相对高频成分上能量的增加而低频部分则无显著变化;(3)覆盖层场地自振频率与S波低频成分主频相近,二者产生共振,导致S波低频放大与高频衰减效应;(4)地震动响应具有极强的方向性,水平向地震动放大效应比垂直向更为显著。
  • 图  1  南桠河两岸监测仪器分布图(方位角118°)

    Figure  1.  Distribution of monitoring sites on both banks of Nanya River

    图  2  南桠河两岸红线地质剖面图

    Figure  2.  Geological profile of both banks at Nanya River

    图  3  2#监测点附近山脊部位的落石以及斜坡变形

    Figure  3.  Rock falls and slope deformation around monitoring site 2# in Shimian County

    表  1  各监测点所在位置场地属性

    Table  1.   Properties of monitoring sites

    监测点编号绝对高程/m震中距/km监测点所在部位场地类型
    1#1150265山体平坡处基岩(花岗岩)
    2#1060265山脊处基岩(花岗岩)
    3#1102267山脊处厚覆盖层
    参照点(石棉先锋)×××薄覆盖层
    下载: 导出CSV

    表  2  各监测点地震动响应参数

    Table  2.   Ground motion response parameters at each monitoring site

    监测点编号峰值加速度/gal阿里亚斯强度/(cm·s−1)
    EWSNUDEWSNUD
    1#1.222.942.230.361.220.89
    2#2.133.642.350.551.800.81
    3#7.4210.182.9415.0913.262.75
    *参照点1.743.361.880.882.700.87
      注:1 gal=1 cm/s2
    下载: 导出CSV

    表  3  监测点3分量连续小波分解图

    Table  3.   Three-component continuous wavelet decomposition

    东西方向南北方向垂直方向
    下载: 导出CSV

    表  4  监测点波峰成分统计表

    Table  4.   Statistical table of signal peak at each site

    方向S波高频波峰S波低频波峰
    1#2#3#参照点1#2#3#参照点
    东西27.23 s37.67 s×32.02 s27.00 s37.76 s36.03 s31.70 s
    2.8 Hz3.9 Hz×3.2 Hz1.4 Hz1.4 Hz1.3 Hz1.1 Hz
    0.0450.078×0.0760.0630.0720.6300.068
    南北26.50 s36.52 s×32.00 s27.09 s36.41 s35.09 s32.27 s
    2.8 Hz3.5 Hz×2.5 Hz1.1 Hz1.1 Hz1.1 Hz1.1 Hz
    0.1200.183×0.1880.1100.1150.6560.138
    垂直26.77 s37.73 s34.85 s32.88 s27.19 s38.13 s35.28 s32.36 s
    3.5 Hz3.5 Hz2.8 Hz3.2 Hz1.1 Hz1.1 Hz1.1 Hz1.1 Hz
    0.0860.1070.1500.0760.0900.0680.0890.068
    下载: 导出CSV

    表  5  3#监测点场地3分量反应图谱

    Table  5.   Three-component response spectrum of monitoring site No.3

    东西向南北向垂直向
    下载: 导出CSV

    表  6  3#监测点三分量特征周期/频率表

    Table  6.   Dominant period / frequency of site 3#

    东西向南北向垂直向
    特征周期/s0.740.880.36
    特征频率/Hz1.351.132.77
    下载: 导出CSV

    表  7  1#与2#监测点三分量特征周期

    Table  7.   Dominant period of site 1# and 2#

    监测点编号特征周期/s
    东西向南北向垂直向
    1#0.260.260.25
    2#0.260.260.28
    下载: 导出CSV
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  • 收稿日期:  2020-03-28
  • 修回日期:  2020-05-13
  • 刊出日期:  2021-04-27

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