Field and simulation study for rock bolt loading characteristics under high stress conditions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F19%3A00504460" target="_blank" >RIV/68145535:_____/19:00504460 - isvavai.cz</a>

Výsledek na webu

<a href="https://ro.uow.edu.au/cgi/viewcontent.cgi?article=2381&context=coal" target="_blank" >https://ro.uow.edu.au/cgi/viewcontent.cgi?article=2381&context=coal</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Field and simulation study for rock bolt loading characteristics under high stress conditions

Popis výsledku v původním jazyce

Rhomboid shaped coal pillars (35 m x 30 m to 26 m x16 m) were formed by anmodified Room and Pillar method below 850 m depth from surface at the CSM mine in thenCzech Republic. The pillars were developed in a shaft protective pillar by driving roadways ofn3.5-4.5 m in height and 5.2 m in width within Panel V of Seam No. 30. Development of pillarsnat such great depth is prone to spalling/fracturing (pillar rib dilation) due to redistribution of thenhigh stress regime. The induced stress driven dilation was measured during partial extractionnof the coal seam within the shaft protective pillar using rib extensometers. In order to stabilizenthe pillar ribs, four rows of rock bolts with 2.4 m length were installed into the pillar from all sidesnat different heights. The immediate roof was also supported by rock bolts at a 1 m grid pattern.nThree-way intersections were made to control the deformation of developed pillars and othernunderground structures. Further, an attempt was made to understand the rock bolt loadingncharacteristics at different stages of rib dilation using numerical modelling with the availablenproperties of rock mass and reinforcement for the studied site. Elastic and Mohr Coulombnstrain-softening constitutive models are considered in FLAC3D to evaluate the performance ofnthe rock bolts. Results obtained on numerical models were found to be in good tune with thenrock bolt loading characteristics monitored during the field study. This paper presents andiscussion about the impact of rib bolting on pillar safety factor and induced load on rock boltnwith respect to the dilation/spalling of pillar ribs at the studied site.

Název v anglickém jazyce

Field and simulation study for rock bolt loading characteristics under high stress conditions

Popis výsledku anglicky

Rhomboid shaped coal pillars (35 m x 30 m to 26 m x16 m) were formed by anmodified Room and Pillar method below 850 m depth from surface at the CSM mine in thenCzech Republic. The pillars were developed in a shaft protective pillar by driving roadways ofn3.5-4.5 m in height and 5.2 m in width within Panel V of Seam No. 30. Development of pillarsnat such great depth is prone to spalling/fracturing (pillar rib dilation) due to redistribution of thenhigh stress regime. The induced stress driven dilation was measured during partial extractionnof the coal seam within the shaft protective pillar using rib extensometers. In order to stabilizenthe pillar ribs, four rows of rock bolts with 2.4 m length were installed into the pillar from all sidesnat different heights. The immediate roof was also supported by rock bolts at a 1 m grid pattern.nThree-way intersections were made to control the deformation of developed pillars and othernunderground structures. Further, an attempt was made to understand the rock bolt loadingncharacteristics at different stages of rib dilation using numerical modelling with the availablenproperties of rock mass and reinforcement for the studied site. Elastic and Mohr Coulombnstrain-softening constitutive models are considered in FLAC3D to evaluate the performance ofnthe rock bolts. Results obtained on numerical models were found to be in good tune with thenrock bolt loading characteristics monitored during the field study. This paper presents andiscussion about the impact of rib bolting on pillar safety factor and induced load on rock boltnwith respect to the dilation/spalling of pillar ribs at the studied site.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/LO1406" target="_blank" >LO1406: Institut čistých technologií těžby a užití energetických surovin - Projekt udržitelnosti</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

COAL 2019 - Coal operators´conference

ISBN

978-1-74128-304-4

ISSN

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e-ISSN

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Počet stran výsledku

9

Strana od-do

171-179

Název nakladatele

University of Wollongong

Místo vydání

Wollongong

Místo konání akce

Wollongong

Datum konání akce

18. 2. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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