微动勘探技术在城市地面沉降检测中的应用研究

doi:10.11720/wtyht.2021.0053

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Abstract

Urban land subsidence is liable to induce ground fractures or even collapse,thus causing safety accidents.However,traditional geophysical methods cannot be applied in cities due to the strong human interference and high requirements for safety and environmental protection in the urban environment.The microtremor survey method is a passive,efficient,and environment-friendly geophysical method and it can be used to detect the underground geological conditions in the urban environment with strong interference.Taking Xiegang Primary School in Hefei City as the research site,this paper focuses on the applicability and effectiveness of the microtremor survey method in detecting the causes of land subsidence.Based on the microtremor survey data collected,the dispersion curve was extracted using the F-K method and then the underground shear wave velocity structure was obtained through inversion,thus revealing the underground geological conditions.Finally,verification was conducted through drilling.The results show that the microtremor survey is an effective geophysical method for detecting the information such as the position and scale of underground unconsolidated soil,and thus the secondary accidents in subsidence areas can be eliminated.

Key words： microtremor survey urban land subsidence unconsolidated soil land subsidence reason F-K method urban geology

Received: 26 January 2021 Published: 21 December 2021

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	Articles by authors
	Hao XU
	Xiao-Ping WU
	Yong SHENG
	Sheng-Zhu LIAO
	Hui-Tao JIA
	Zi-Qiao XU

Cite this article:

Hao XU,Xiao-Ping WU,Yong SHENG, et al. Application of microtremor survey method in detection of urban land subsidence[J]. Geophysical and Geochemical Exploration, 2021, 45(6): 1512-1519.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.0053 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I6/1512

Schematic diagram of the principle for microtremor survey

Flow chart of surface wave dispersion extraction by F-K method

Settlement and cracking in the study area

Location of microtremor survey and verification boreholes

Schematic diagram of 7-points linear microtremor array

The original waveform (a) and dispersion curve (b) for the 12^th point of No.7 profile

Engineering geological profile of the study area

Contour maps of No.7 profile(a) and physical picture of JZ5 borehole(b)

Contour maps of No.5 profile(a) and physical picture of JZ4 borehole(b)

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