Spatial and temporal microseismic evolution before rock burst in steeply dipping thick coal seams under alternating mining of adjacent coal seams

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F21%3A00546789" target="_blank" >RIV/68145535:_____/21:00546789 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007%2Fs12517-021-08439-8" target="_blank" >https://link.springer.com/article/10.1007%2Fs12517-021-08439-8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s12517-021-08439-8" target="_blank" >10.1007/s12517-021-08439-8</a>

Result language

angličtina

Original language name

Spatial and temporal microseismic evolution before rock burst in steeply dipping thick coal seams under alternating mining of adjacent coal seams

Original language description

Due to the complex geological conditions and special mining approach of the steeply dipping thick coal seam in the south mining area of the Wudong coal mine, dynamic hazards are frequently encountered during horizontal section top-coal caving. Identification of rock burst precursor information can help effectively avoid its occurrence, decrease unnecessary loss, and ensure personal safety of underground workers. The B3+6 coal seam working face of the south mining area of the Wudong coal mine at +475 m level and +450 m level is monitored using a microseismic (MS) monitoring system. The spatial and temporal evolution patterns of MS parameters before rock burst occurrence are investigated and compared with the evolution pattern of precursor characteristics in the gently inclined coal seam. The results show the following data: (1) The daily MS total energy and event count exhibited a sudden decrease and abnormal fluctuation before rock burst occurrence in the steeply dipping thick coal seam of the south mining area of the Wudong coal mine, which can be employed as an effective precursor signal for rock burst early warning. (2) The MS sources were mainly concentrated around the rock pillar, which created a high static stress condition for the occurrence of rock burst and served as the force source of rock burst. The rock pillar was also the main cause of rock burst in the B3+6 coal seam. (3) The MS event aggregation index is defined, which shows sudden fall and rise variation and reaches an extremely low value immediately before the rock burst occurrence. This phenomenon can be considered as a rock burst precursor in the steeply dipping thick coal seam of the south mining area of the Wudong coal mine. (4) For the steeply dipping thick coal seam, the sharp rise and fall of the daily MS average energy does not necessarily mean rock burst occurrence, while the abnormal fluctuation of the daily MS average energy is very likely the precursor of rock burst occurrence. (5) More attention should be paid to the floor (rock pillar) rather than the roof in the study of rock burst in the steeply dipping thick coal seam under similar conditions.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20703 - Mining and mineral processing

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Arabian Journal of Geosciences

ISSN

1866-7511

e-ISSN

1866-7538

Volume of the periodical

14

Issue of the periodical within the volume

20

Country of publishing house

DE - GERMANY

Number of pages

28

Pages from-to

2097

UT code for WoS article

000702467900013

EID of the result in the Scopus database

2-s2.0-85116086722