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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第42卷

期数:

2020年第04期

页码:

540-551

栏目:

应用地球物理

出版日期:

2020-07-15

文章信息/Info

Title:

Characteristics of Slope Seismic Response Under Strong Earthquake in Hilly Morphologic Area—The Case of Changning County in Sichuan Province, China

文章编号:

1672-6561(2020)04-0540-12

作者:

王运生; 明伟庭; 刘江伟; 赵波

(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)

Author(s):

WANG Yun-sheng;  MING Wei-ting;  LIU Jiang-wei;  ZHAO Bo

(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China)

关键词:

地震动响应;  斜坡;  长宁M_s 6.0级地震;  丘陵;  地形放大效应;  傅里叶频谱;  加速度反应谱;  四川

Keywords:

seismic response;  slope;  Changning M_s 6.0 earthquake;  hilly;  topography amplification effect;  Fourier spectrum;  acceleration response spectrum;  Sichuan

分类号:

P642.27

DOI:

10.19814/j.jese.2020.01014

文献标志码:

A

摘要:

前人对高山峡谷地貌区高位斜坡动响应研究较多,但对低山、丘陵地貌区斜坡强震动响应研究很少。并且,研究这类地区顺倾斜坡的地震动响应对揭示长宁M_s 6.0级地震丰富的次生山地灾害动力机理具有一定意义。在四川省长宁县丘陵地貌区典型顺倾斜坡不同部位安置强震监测仪器,捕捉到40多次余震,通过SeismoSignal软件处理典型余震数据,分析峰值加速度、阿里亚斯强度、傅里叶频谱、加速度反应谱,进而采用水平/竖直向谱比法分析局部场地效应,最后对比分析低山、丘陵地貌区与高山峡谷地貌区的斜坡动响应。结果表明:坡顶峰值加速度可达4.171 m·s^-2,最大位移可达0.008 05 m,当峰值加速度大于1.0 m·s^-2时,阿里亚斯强度出现陡增的趋势; 局部地形的放大效应使得地质灾害以沿山脊的裂缝及小型崩塌为主,在低频2～5 Hz处,斜坡中上部易发生山体共振。以上研究揭示了砂、页岩顺倾斜坡高位放大效应,为地震山地灾害易发性区划提供地震监测资料。

Abstract:

There are many studies on seismic response of high slope in deep-cut valley morphologic area, but the research is rarely found in hilly morphologic area. It is of great significance to study seismic response of the inclined slope in this area to reveal the dynamic mechanism of abundant secondary mountain disasters caused by Changning M_s 6.0 earthquake. The strong earthquake instrument was placed in different parts of the typical slope in hilly morphologic area of Changning county, Sichuan province, and more than 40 aftershocks were captured. The data of typical aftershocks were processed by SeismoSignal software to analyse the peak acceleration, Arias intensity, Fourier spectrum and acceleration response spectrum, then the local site effect was analysed by horizontal/vertical spectrum ratio(HVSR)method. Finally, the seismic response of slopes in hilly morphologic area was compared with that in deep-cut valley morphologic area. The results show that the peak acceleration can reach 4.171 m·s^-2 with the maximum displacement of 0.008 05 m at the top of slope; when the peak acceleration is greater than 1.0 m·s^-2, Arias intensity increases sharply; the geological disasters caused by the local topography amplification effect mainly consist of ridges and small collapse, and mountain resonance possibly occurs in the middle and upper of slope at the low frequency of 2-5 Hz. The above researches reveal the high-amplification effect of inclined slope in sand and shale, and provide a large amount of seismic monitoring data for the susceptibility of earthquake-induced mountain disasters.

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相似文献/References:

[1]王运生,刘江伟,赵波,等.四川珙县Ms 5.4级地震斜坡地震动响应特征[J].地球科学与环境学报,2019,41(05):613.
　WANG Yun-sheng,LIU Jiang-wei,ZHAO Bo,et al.Response Characteristics of Slope Seismic to Gongxian Ms 5.4 Earthquake in Sichuan, China[J].Journal of Earth Sciences and Environment,2019,41(04):613.

备注/Memo

备注/Memo:

收稿日期:2020-01-11; 修回日期:2020-04-25; 网络首发日期:2020-06-17投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家自然科学基金项目(41877235); 国家重点研发计划项目(2017YFC1501000); 国家自然科学基金创新研究群体项目(41521002); 地质灾害防治与地质环境保护国家重点实验室自主课题基金项目(SKLGP2015Z001)
作者简介:王运生(1960-),男,安徽潜山人,教授,博士研究生导师,工学博士,E-mail:wangys60@163.com。

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