Destress blasting on the border of safety pillars

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F16%3A00507369" target="_blank" >RIV/68145535:_____/16:00507369 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Destress blasting on the border of safety pillars

Original language description

Destress blasting used at the border of safety pillars represents a special kind of destress blasting. The main goal of this type of destress blasting is to separate relatively more deformed mining areas from a non-mined safety pillar area such as a shaft pillar or cross-cut pillar, in order to reduce the impact of high stress concentration in areas within the safety pillar. Destress blasting is carried out in rigid, competent rocks adjacent to hardcoal seams 5 m to 6 m thick at depths ranging from 700 m to 1000 m below the surface. Total explosive charge of up to 3450 kg is fired simultaneously in three to seven fan-pattern and line-pattern boreholes drilled from the maingate and the tailgate, when the longwall face approaches to within round 100 m of the safety pillar border. Use of this type of destress blasting from hardcoal longwall mining in the Czech part of the Upper Silesian Coal Basin is described here. Natural and mining conditions are described together with the design parameters of destress blasting, registered seismic activity during longwall mining, and evaluation of the stress relief effect calculated from the monitored seismological data. The present study argues for using this kind of destress blasting as a proactive rockburst prevention method during mining of thick hardcoal seams. Destress blasting can decrease high stress levels and consequently minimize rockburst hazards on the border regions of the safety pillars.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20301 - Mechanical engineering

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Article name in the collection

OPERATIONAL AND ENVIRONMENTAL MINE HEALTH AND SAFETY PRACTICE AND INNOVATION

ISBN

978-1-77247-005-5

ISSN

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e-ISSN

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Number of pages

9

Pages from-to

45-53

Publisher name

MCGILL UNIV

Place of publication

Montreal

Event location

Montreal

Event date

Aug 13, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000410525800007