Regional stress effect monitoring and precursory characteristics of dynamic disasters in deep coal mining

WU Haoyuan; ZHAO Yanbing; YANG Yong; XIA Lei; SUN Yuanyuan

doi:10.12090/j.issn.1006-6616.20232905

Volume 29 Issue 3

Jun. 2023

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Article Navigation > Journal of Geomechanics > 2023 > 29(3): 355-364

WU H Y，ZHAO Y B，YANG Y，et al.，2023. Regional stress effect monitoring and precursory characteristics of dynamic disasters in deep coal mining[J]. Journal of Geomechanics，29（3）：355−364 doi: 10.12090/j.issn.1006-6616.20232905

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Regional stress effect monitoring and precursory characteristics of dynamic disasters in deep coal mining

doi: 10.12090/j.issn.1006-6616.20232905

1.
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Baodian Coal Mine, Shandong Yanzhou Coal Mining Co., Ltd, Zoucheng 273500, Shandong, China
3.
Yankuang Engergy Group Company Limited, Zoucheng 273500, Shandong, China

Funds: This research is financially supported by the Major Scientific and Technological Innovation Projects of Shandong Province (Grants 2019SDZY02 and 2019SDYZ05).

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Received: 2023-02-20
Revised: 2023-05-05
Accepted: 2023-05-11

Abstract

Abstract

Dynamic disaster formation and triggering are closely related to the mechanical behavior of the regional stress field. The regional local stress field is continuously adjusted and changed under the effect of coal mining disturbance. In order to study the precursor response of regional stress field change to dynamic disasters, we used the analytical methods of variational modal decomposition and Hilbert transform to perform time-frequency analysis on the data collected from the Baodian coal mine and to identify and extract the intrinsic modal function (IMF) components reflecting the abnormal dynamic changes in the borehole strain data. The results show that the borehole strain observation data can effectively record the small changes inside the rock mass related to the mining disturbance. After decomposition and transformation, the abnormal fluctuation characteristics of IMF components appear two days before the dynamic pressure event, which is characterized by a “sudden jump” from the stage of stable deformation to the stage of rapid change, “shock” in the stage of rapid deformation change and “drop” in the stage of instability. According to the three-stage theory of seismic deformation, the normal starting time of deformation before the occurrence of dynamic disasters and the “sudden jump-shock-fall” are used as the precursor criteria for the occurrence of coal mine dynamic disasters. Based on the accurate observation of the regional stress field by borehole strainmeter, a criterion method applied to the warning of coal mine power hazards is constructed, which can provide a reference for the safe and efficient recovery of working faces under similar mining environments in coal mines.
- dynamic disaster,
- variational mode decomposition,
- borehole strain,
- Hilbert transform,
- precursory characteristics

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