Fine detection of shallow coal mined-out areas by multichannel analysis of surface waves

Yang Zhi; Li Yü; Zhao Fei; Wei Hongxue; Guan Jianbo; Jin Chaobin; Zhao Meng

doi:10.19606/j.cnki.jmst.2022.01.011

Volume 7 Issue 1

Feb. 2022

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Article Navigation > Journal of Mining Science and Technology > 2022 > 7(1): 113-122

Yang Zhi, Li Yü, Zhao Fei, Wei Hongxue, Guan Jianbo, Jin Chaobin, Zhao Meng. Fine detection of shallow coal mined-out areas by multichannel analysis of surface waves[J]. Journal of Mining Science and Technology, 2022, 7(1): 113-122. doi: 10.19606/j.cnki.jmst.2022.01.011

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Fine detection of shallow coal mined-out areas by multichannel analysis of surface waves

doi: 10.19606/j.cnki.jmst.2022.01.011

Yang Zhi^{1, 2
,},
Li Yü^{1, 2
,
,},
Zhao Fei³,
Wei Hongxue³,
Guan Jianbo^{1, 2},
Jin Chaobin^{1, 2},
Zhao Meng^{1, 2}

1.
School of Geological Engineering and Geomatics, Chang'an University, Xi'an Shaanxi 710054, China
2.
Key Laboratory of Western China Mineral Resources and Geological Engineering, Chang'an University, Xi'an Shaanxi 710054, China
3.
The Institute of Geophysical and Chemistry Exploration of Shanxi, Yuncheng Shanxi 044000, China

Received Date: 2021-10-29
Rev Recd Date: 2021-11-12
Publish Date: 2022-02-01

Abstract

Abstract

In order to finely detect the distribution range of shallow coal mined-out areas, a low-frequency focused factor is introduced into the phase shift method, and a low-frequency focused phase shift method is proposed, which has the advantage of extracting low-frequency dispersion energy on a short receivor array.The synthetic test results show that the low-frequency focused phase shift method significantly improves the focus of the dispersion energy at the low frequency, extends the range of frequency bands that can be picked up, and increases the detection depth.Meanwhile, the method shortens the spread length required to calculate the dispersion energy, ensuring that the MASW method has a high lateral resolution.The real data in the shallow coal mined-out area shows that using the low-frequency focused phase shift method in the dispersion energy extraction, the MASW method obtains high-precision horizontal slices of the shear wave velocity and identifies the extent of the mined-out area, the location of the security pillar and its geometry.It confirms the effectiveness of the low-frequency focused phase shift method to improve the lateral resolution of MASW and the feasibility to detect the shallow coal mined-out area finely.
- coal mined-out area,
- multichannel analysis of surface waves,
- low-frequency focus phase shift method,
- dispersion energy,
- shear wave velocity

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References(30)

References

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Fine detection of shallow coal mined-out areas by multichannel analysis of surface waves

doi: 10.19606/j.cnki.jmst.2022.01.011

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