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Conference Proceedings

Ground Movement and Control Related to Coal Mining, Wollongong

Conference Proceedings

Ground Movement and Control Related to Coal Mining, Wollongong

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An Evaluation of Fracture Toughness of Coal Measures Rocks

This research work is concerned with an investigation of the fracture toughness of sandstone, siltstone, and coal. Tensile failure trades have been examined with three different specimen geonetries, i.e; rectangular bar, round bar (in three point bending), and diametral compression discs. The Stress intensity approach, and J-integral methods were used to evaluate fracture toughness. Results from both approaches are discussed. True crack length was determined after pre-cracking, using the compliance calibration technique. Fracture toughness results of sandstone are independent of crack length and the size of the specimen._x000D_
Fracture toughness may hence be regarded as a material property for sandstone. In cxnntrast fracture toughness values for !siltstone and coal are dependent on crack Length.
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  • An Evaluation of Fracture Toughness of Coal Measures Rocks
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  • Published: 1986
  • PDF Size: 0.842 Mb.
  • Unique ID: P198603002

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