|Ŀ¼/Table of Contents|

[1]Ľ,ų.ԭúжΧѹ΢źӦ*[J].йȫѧ,2022,18(10):94-100.[doi:10.11731/j.issn.1673-193x.2022.10.014]
LEI Wenjie,ZHANG Zhaoyang.Response characteristics of micro-seismic signals during unloading confining pressure process of raw coal[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2022,18(10):94-100.[doi:10.11731/j.issn.1673-193x.2022.10.014]

ԭúжΧѹ΢źӦ*

йȫѧ[ISSN:1673-193X/CN:11-5335/TB]

:
18
:
202210
ҳ:
94-100
Ŀ:
ְҵȫ뼼
:
2022-10-31

Ϣ/Info

Title:
Response characteristics of micro-seismic signals during unloading confining pressure process of raw coal
±:
1673-193X(2022)-10-0094-07
:
Ľų
ѧ ȫѧ빤ѧԺ 454000
Author(s):
LEI Wenjie ZHANG Zhaoyang
(School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo Henan 454000,China)
ؼ:
жΧѹ΢źŷԭúƻʱƵ
Keywords:
unloading confining pressure micro-seismic monitoring signal analysis raw coal damage time frequency characteristic
:
X936
DOI:
10.11731/j.issn.1673-193x.2022.10.014
ױ־:
A
ժҪ:
Ϊоúɶжʧƻ΢̬Ӧɣк˹ԭúжΧѹɼе΢źţС任4С任ʶúźţúѸźŵʱƵӦ΢¼ֲƻݱоسѹӹУúڲ϶ѹܣ϶΢¼ʼжΧѹʱúѸӣڲչźƵΪ700 Hzǰúڲչ¼ƵεͣúƻźƵΪ800 HzƵ쳣źƵʳɷԷִúƻʱ΢źƻа治ͬλλƣĦ꣬ƻƵʳɷָӣúƻʱ΢¼ƵLH-2¼Ϊ176ƻʱÿ¼Ϊ76ƻ¼Ϊ92ֱռ¼43%52%LH-3ƻ¼ƻ¼ֱռ36%62%
Abstract:
To study the micro-seismic dynamic response law of coal instability and failure caused by coal excavation and unloading,the unloading confining pressure tests of gas-bearing raw coal were carried out by using the thermal-fluid-solid coupling triaxial test machine.The micro-seismic signals in the test process were collected for continuous wavelet transform and 4-layer wavelet packet transform to identify the signals of coal sample fracture,then the time-frequency characteristics of coal sample fracture interference signal and the corresponding distribution and failure evolution characteristics of micro-seismic events were put forward.The results showed that in the initial stage of loading and even in the whole process of axial pressure increase,the internal fractures of coal samples were compacted,there was no new fracture,and there was basically no micro-seismic events.When the unloading confining pressure started,the number of coal sample cracks increased rapidly.The main frequency of internal fracture propagation signal was 700 Hz,and in the early stage,the internal crack propagation of coal sample was slow,and the frequency of events was low.The dominant frequency of coal sample destruction signal is 800 Hz,its frequency varies greatly,and the signal frequency component has no obvious zoning.The energy of micro-seismic signal at the moment of coal sample failure was the largest.The failure process was accompanied by the relative displacement between different parts,resulting in friction and rubbing,and the failure frequency components were complex.The frequency of micro-seismic events at the moment of coal sample failure was the largest,and the total number of LH-2 events was 176.The number of events per minute at the moment of failure was 76,and the number of events after failure was 92,accounting for 43% and 52% of the total events,respectively.The number of LH-3 failure events and post failure events accounted for 36% and 62%,respectively.

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ע/Memo

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ոڣ 2022-03-10
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