微动B超技术在堤坝隐患检测中的应用

doi:10.11720/wtyht.2023.1027

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Abstract

To quickly and effectively detect the hidden hazards of dams,this study proposed the microtremor B-mode ultrasound technology based on linear arrays.Most of the (earth) dams also act as highways,and the vibration signals generated from running vehicles propagate along dams.Therefore,this study proposed deploying linear arrays along the dams,with the vibration propagation direction consistent with the signal receiving direction.In this way,abundant vibration sources can be provided for detecting hidden hazards of the dams.The results of this study show that the data on multiple exploration points can be simultaneously acquired using the multi-channel acquisition technique based on linear arrays,thus improving the efficiency of field data acquisition.Moreover,the influence of source differences can be avoided,and the lateral resolution and the accuracy of exploration results can be improved.The technology proposed in this study was applied to the pre-flood safety inspection of a dam in Jiujiang,Jiangxi Province.Three low-velocity hidden hazards were identified in this dam and were presumed to be the weak layers of the dam foundation and the loose media of the dam body.Practices have proved that this technology effectively counteracts the deficiencies (i.e.,low efficiency and lateral resolution) of the previous microtremor exploration.Moreover,this technology allows scanning at a spacing of 1 m or 0.5 m,thus improving the lateral resolution.This study will provide efficient and accurate guidance for dam safety management.

Key words： hidden hazards of dams microtremor B-mode ultrasound technology dam safety management

Received: 26 January 2022 Published: 24 February 2023

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	Articles by authors
	Juan-Juan QI
	Hong-Qiang FAN
	Jing-Lun LI
	Zi-Jian CHEN
	Xiao-Tong HUANG
	Shu-Tong ZHANG

Cite this article:

Juan-Juan QI,Hong-Qiang FAN,Jing-Lun LI, et al. Application of the microtremor B-mode ultrasound technology in detecting the hidden hazards of dams[J]. Geophysical and Geochemical Exploration, 2023, 47(1): 257-263.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1027 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I1/257

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