High precision detection and evaluation of karst features based on borehole ultrasonic imaging

JIA Long; LEI Mingtang; CHENG Xiaojie

doi:10.12097/j.issn.1671-2552.2022.2-3.023

2022 Vol. 41, No. 2-3

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JIA Long, LEI Mingtang, CHENG Xiaojie. High precision detection and evaluation of karst features based on borehole ultrasonic imaging[J]. Geological Bulletin of China, 2022, 41(2-3): 453-460. doi: 10.12097/j.issn.1671-2552.2022.2-3.023

Citation:

JIA Long, LEI Mingtang, CHENG Xiaojie. High precision detection and evaluation of karst features based on borehole ultrasonic imaging[J]. Geological Bulletin of China, 2022, 41(2-3): 453-460. doi: 10.12097/j.issn.1671-2552.2022.2-3.023

High precision detection and evaluation of karst features based on borehole ultrasonic imaging

1.
Key Laboratory of Karst Dynamics, MNR & GZAR/Institute of Karst Geology, CAGS, Guilin 541004, Guangxi, China
2.
Innovation Center of Karst Collapse Prevention Technology, China Geological Survey, Guilin 541004, Guangxi, China

Received Date: 06 August 2020

Revised Date: 03 November 2020

Publish Date: 15 March 2022

Abstract

Abstract

Complex karst often restricts human engineering construction.In order to avoid the adverse geological problems related to karst, how to detect and evaluate the karst features more accurately is one of the difficult problems in karst exploration.The borehole ultrasonic imaging technology was utilized to accurately depict the karst phenomenon revealed from borehole, and based on the borehole line karst rate, the concept of 'borehole wall karst rate' was proposed to extend the one-dimensional space expression of karst rate to the two-dimensional space expression, which provided more refined basic data for engineering construction in the karst area.The example shows that the ultrasonic imaging technology could make up for the drilling coring difficulty in karst area, and could display the surface characteristics of borehole wall with high resolution in the whole section, so as to achieve the purpose of detecting karst phenomenon with high precision and evaluating karst characteristics with fine quantitative analysis.The ultrasonic imaging technique to calculate the borehole wall karst rate is not only possible to analyze the variation or stratification of karst development with depth, but also to analyze the characteristics of karst development in different directions of the stratum.
- karst rate /
- ultrasonic logging /
- karst detection /
- karst development evaluation /
- geological survey engineering

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References

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