综合利用多道瞬态面波和微动探测分析斜坡内部结构

doi:10.11720/wtyht.2022.2498

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Abstract

According to the characteristics of thin eluvium and poor topographic conditions in research area,this paper analyzes the suitability and effectiveness of multi-channel transient surface wave and microtremor survey technology in investigating slope internal structure of the typical slope in Luniao Town,Yuhang District,Hangzhou Ctity.The dispersion curve is extracted using frequency-wave number (F-K) and spatial autocorrelation method(SPAC).Based the velocity profile,the surface silty clay with breccia,completely weathered tuff,strongly weathered tuff and medium-slightly weathered tuff is interpreted.The results show that the surface wave exploration can effectively distinguish the internal structure of slope covered by thin eluvium.Both multi-channel transient surface wave and microtremor survey have a high accuracy in depth interpretation of the interface between strongly weathered and medium-slightly weathered tuff,which is well consistent with the borehole data,and there is a little bit of error in depth interpretation of the interface between surface silty clay with breccia and completely weathered tuff.The data analysis also shows that the fitting relationship between spatial autocorrelation function and Bessel function J₀ is good when frequency less than 15 Hz,and the accuracy lose when it is higher than 15 Hz.Furthermore,the microtremor survey velocity is generally lower than the multi-channel transient surface waves exploration velocity.

Key words： eluvium and deluvium slop structure microtremor survey multi-channel transient surface wave spatial autocorrelation(SPAC) frequency wave number(F-K)

Received: 02 November 2020 Published: 25 February 2022

ZTFLH:

P613.4

Corresponding Authors: LEI Xiao-Dong E-mail: liqiaoling959@Foxmail.com;xiaodong@139.com

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	Articles by authors
	Qiao-Ling LI
	Hui ZHANG
	Xiao-Dong LEI
	Chen LI
	Hao FANG
	Wei GUAN
	Yu-Da HAN
	Xu-Chen ZHAO

Cite this article:

Qiao-Ling LI,Hui ZHANG,Xiao-Dong LEI, et al. Analyses of internal structure of slopes using multi-channel transient surface wave exploration and microtremor survey[J]. Geophysical and Geochemical Exploration, 2022, 46(1): 258-267.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.2498 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I1/258

Surface wave field data acqusion location

Surface wave field data acquisition array diagram
a~f—radius combination diagram of microtremor cross array;g—transient surface wave array with single shot and multi-trace acquisition arrangement

Bessel function fitting of microtremor survey point W02

Dispersion curves of microtremor survey and transient surface wave exploration at the same location

Phase velocity profile of AB line
a—phase velocity profile of transient surface wave exploration;b—phase velocity profile of microtremor survey

Statistics table of borehole data in the research area

Apparent S-wave velocity profile of AB line

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