Stability study of coal pillars due to induced stress driven spalling during development and mechanised depillaring at different depths of cover

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F24%3A00588347" target="_blank" >RIV/68145535:_____/24:00588347 - isvavai.cz</a>

Výsledek na webu

<a href="https://cdnsciencepub.com/doi/10.1139/cgj-2024-0114" target="_blank" >https://cdnsciencepub.com/doi/10.1139/cgj-2024-0114</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1139/cgj-2024-0114" target="_blank" >10.1139/cgj-2024-0114</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Stability study of coal pillars due to induced stress driven spalling during development and mechanised depillaring at different depths of cover

Popis výsledku v původním jazyce

Induced stress driven spalling in coal pillars depends on several factors including depth of cover, in-situ stresses and presence of weak planes. A solid coal pillar generally experiences spalling at a higher depth. Fender and snook/rib experiences considerable spalling during depillaring even at lower depth below strong and massive rock mass. The spalling in pillars leads to instability at working places including goaf encroachment during depillaring. This paper discusses the measurement of induced stress driven spalling during development of a seam having weak roof-pillar interface at 850-900 m at CSM mine in Czech Republic. Spalling is also examined in different form of coal pillars during mechanized depillaring at 250 m depth at Godavarikhani 11 Incline mine in India. Finite difference based numerical modelling was carried out to assess the behaviour of the pillars. Ultimate non-elastic region was observed up to 9 m near the roof-pillar interface due to presence of weak plane and around 8 m at middle height of the pillar at the higher depth. At the moderate depth of around 250 m, maximum vertical induced stress was observed over a fender. Spalling of 2 m and 1.5 m was observed in the fender and pillar respectively.

Název v anglickém jazyce

Stability study of coal pillars due to induced stress driven spalling during development and mechanised depillaring at different depths of cover

Popis výsledku anglicky

Induced stress driven spalling in coal pillars depends on several factors including depth of cover, in-situ stresses and presence of weak planes. A solid coal pillar generally experiences spalling at a higher depth. Fender and snook/rib experiences considerable spalling during depillaring even at lower depth below strong and massive rock mass. The spalling in pillars leads to instability at working places including goaf encroachment during depillaring. This paper discusses the measurement of induced stress driven spalling during development of a seam having weak roof-pillar interface at 850-900 m at CSM mine in Czech Republic. Spalling is also examined in different form of coal pillars during mechanized depillaring at 250 m depth at Godavarikhani 11 Incline mine in India. Finite difference based numerical modelling was carried out to assess the behaviour of the pillars. Ultimate non-elastic region was observed up to 9 m near the roof-pillar interface due to presence of weak plane and around 8 m at middle height of the pillar at the higher depth. At the moderate depth of around 250 m, maximum vertical induced stress was observed over a fender. Spalling of 2 m and 1.5 m was observed in the fender and pillar respectively.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20701 - Environmental and geological engineering, geotechnics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Canadian Geotechnical Journal

ISSN

0008-3674

e-ISSN

1208-6010

Svazek periodika

62

Číslo periodika v rámci svazku

January 2025

Stát vydavatele periodika

CA - Kanada

Počet stran výsledku

16

Strana od-do

—

Kód UT WoS článku

001342496000001

EID výsledku v databázi Scopus

2-s2.0-85217059953