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

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

金刚^{1, 2,},
王运生^1, ,,
何先龙²,
史丙新³,
周宇航¹

1.
成都理工大学地质灾害防治与地质环境保护国家重点实验室，四川成都　610059
2.
中国地震局工程力学研究所，河北廊坊　065000
3.
四川省地震局，四川成都　610041

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
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出版历程
- 收稿日期: 2020-03-28
- 修回日期: 2020-05-13
- 刊出日期: 2021-04-27

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

1.
State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu, Sichuan　610059, China
2.
Institute of Engineering Mechanics, China Earthquake Administration, Langfang, Hebei　065000, China
3.
Seismological Bureau of Sichuan Province, Chengdu, Sichuan　610041, China

摘要

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M_s6.0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。
- 连续小波变换 /
- 长宁地震 /
- 山体地震动响应 /
- 时频分析
Abstract: In northwest Sichuan Province, due to the frequent earthquakes, the rocky hill slopes in the valley area usually get loosen and lead to the failure. For geohazard prevention and mitigation, it is important to determine the site amplification effects and seismic responses of hillslopes. For example, the 2019 Changning M_s6.0 earthquake that occurred in Changing County of Yibin, Sichuan Province, China, was well recorded in three earthquake monitoring stations located on both bank sides of Nanya River in Shimian County, Sichuan Province, China. In this study, detailed analyses of the recorded seismic data had been conducted with the method of Continuous Wavelet Transform and confirmed the following observations: (1) For S-wave, two sorts of components in the frequency domain were found, whose main frequency values were around 3.5 Hz and 1.1 Hz respectively. (2) The seismic amplification effect at the ridge was mainly reflected by the energy increase in the high frequency component of the S-wave, no clear changes in the low frequency component of the S-wave was found. (3) In soil site, the natural frequency of vibration was close to the main frequency of the low frequency component of the S-wave, resonance between the two components was generated, resulting in low-frequency amplification and high-frequency attenuation effect. (4) The seismic response to mountain hill slopes had a strong directivity, and the amplification effect in the horizontal directions was much stronger than that of the vertical directions.
- continuous wavelet transform /
- Changning earthquake /
- seismic response /
- time-frequency analyses

HTML全文

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

下载: 全尺寸图片幻灯片

图 2 南桠河两岸红线地质剖面图

Figure 2. Geological profile of both banks at Nanya River

下载: 全尺寸图片幻灯片

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

下载: 全尺寸图片幻灯片

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#	1150	265	山体平坡处	基岩（花岗岩）
2#	1060	265	山脊处	基岩（花岗岩）
3#	1102	267	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)
监测点编号	EW	SN	UD	EW	SN	UD
1#	1.22	2.94	2.23	0.36	1.22	0.89
2#	2.13	3.64	2.35	0.55	1.80	0.81
3#	7.42	10.18	2.94	15.09	13.26	2.75
*参照点	1.74	3.36	1.88	0.88	2.70	0.87
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
方向	1#	2#	3#	参照点	1#	2#	3#	参照点
东西	27.23 s	37.67 s	×	32.02 s	27.00 s	37.76 s	36.03 s	31.70 s
	2.8 Hz	3.9 Hz	×	3.2 Hz	1.4 Hz	1.4 Hz	1.3 Hz	1.1 Hz
	0.045	0.078	×	0.076	0.063	0.072	0.630	0.068
南北	26.50 s	36.52 s	×	32.00 s	27.09 s	36.41 s	35.09 s	32.27 s
	2.8 Hz	3.5 Hz	×	2.5 Hz	1.1 Hz	1.1 Hz	1.1 Hz	1.1 Hz
	0.120	0.183	×	0.188	0.110	0.115	0.656	0.138
垂直	26.77 s	37.73 s	34.85 s	32.88 s	27.19 s	38.13 s	35.28 s	32.36 s
	3.5 Hz	3.5 Hz	2.8 Hz	3.2 Hz	1.1 Hz	1.1 Hz	1.1 Hz	1.1 Hz
	0.086	0.107	0.150	0.076	0.090	0.068	0.089	0.068

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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

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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/s	0.74	0.88	0.36
特征频率/Hz	1.35	1.13	2.77

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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
监测点编号	东西向	南北向	垂直向
1#	0.26	0.26	0.25
2#	0.26	0.26	0.28

下载: 导出CSV

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