Rockburst prevention via destress blasting of competent roof rocks in hard coal longwall mining

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F18%3A00491712" target="_blank" >RIV/68145535:_____/18:00491712 - isvavai.cz</a>

Result on the web

<a href="http://www.scielo.org.za/pdf/jsaimm/v118n3/09.pdf" target="_blank" >http://www.scielo.org.za/pdf/jsaimm/v118n3/09.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.17159/2411-9717/2018/v118n3a6" target="_blank" >10.17159/2411-9717/2018/v118n3a6</a>

Result language

angličtina

Original language name

Rockburst prevention via destress blasting of competent roof rocks in hard coal longwall mining

Original language description

Although the application of destress blasting as an active rockburst mitigation measure is not yet commonplace in hard coal longwall mining, the method is assuming heightened importance due to increases in mining depth and high horizontal stresses in the rock mass. The main goals of destress blasting are the softening of competent rock layers, the reduction of strain energy storage, and rock mass stress release, which together contribute to minimizing rockburst occurrence and risk. One such region in which destress blasting in competent rock is applied is the Upper Silesian Coal Basin, mainly in its Czech part. Here a case study of destress blasting is presented and evaluated in terms of rockburst prevention, focusing on a thick coal seam (about 5 m) subject to longwall mining under very unfavourable geomechanical conditions (great depth - 1200 m, competent rigid rocks between coal seams, unfavourable stress field due to long-term mining). Destress blasting stages were carried out in groups of between four and eight boreholes 95 mm in diameter, with the total explosive charge ranging from 2100 kg to 3750 kg, detonated regularly at distances of 43 m to 114 m ahead of the advancing longwall face. Evaluation of destress blasting based on seismic monitoring revealed that the longwall blasts were very successful in terms of rock mass stress release and decreasing the rockburst risk, with only one rockburst occurring on a roadway 210 m from the longwall face. The following longwall section was mined safely without rockburst occurrence.

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

<a href="/en/project/LO1406" target="_blank" >LO1406: Institute of clean technologies for mining and utilization of raw materials for energy use -Sustainability program</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

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

Name of the periodical

Journal of the Southern African Institute of Mining and Metallurgy

ISSN

2225-6253

e-ISSN

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Volume of the periodical

118

Issue of the periodical within the volume

3

Country of publishing house

ZA - SOUTH AFRICA

Number of pages

8

Pages from-to

235-242

UT code for WoS article

000432337200006

EID of the result in the Scopus database

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