The Analysis of the Water-Expanded Rock Bolts Ruptures During Pressure Test

This paper describe the investigation of a water-expanded rock bolts failed during pressure test (inner water pressure of 330 bar). A main objective of this work was to determine the cracks nucleation and propagation mechanism. It was found that the rock bolts failure was promoted by presence of non...

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Veröffentlicht in:	Archives of mining sciences = Archiwum górnictwa 2017-06, Vol.62 (2), p.423-430
Hauptverfasser:	Pawłowski, Bogdan, Krawczyk, Janusz, Bała, Piotr, Cios, Grzegorz, Tokarski, Tomasz
Format:	Artikel
Sprache:	eng
Schlagworte:	Ageing Belts Bolts Chemical composition Crack propagation Cracking (chemical engineering) Cracking (corrosion) failure Hydrostatic pressure non-metallic inclusions Nonmetallic inclusions Nucleation Precipitation hardening Pressure Rock bolts Rocks Steel strain ageing Sulfides Sulphides Water pressure water-expanded rock bolt
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Beschreibung
Zusammenfassung:	This paper describe the investigation of a water-expanded rock bolts failed during pressure test (inner water pressure of 330 bar). A main objective of this work was to determine the cracks nucleation and propagation mechanism. It was found that the rock bolts failure was promoted by presence of non-metallic inclusions (mainly long sulphide inclusions) but the primary cause of cracking is strain ageing of steel. Suggestions for improving the behaviour of steel used for water-expanded rock belts by the modification of its chemical composition are proposed finally.
ISSN:	1689-0469 0860-7001 1689-0469
DOI:	10.1515/amsc-2017-0032