Effect of specimen size on compressive strength of coal

Conference · Sun Dec 01 00:00:00 EST 1996

OSTI ID:405564

Khair, A W; Achanti, V B ^[1]

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1. West Virginia Univ., Morgantown, WV (United States)

Laboratory studies indicate that the specimen size influences the compressive strength of coal significantly. In the past, the diameter/height ratio of coal and rock specimens with different geometry and its influence on failure characteristics was discussed. In the current attempt, tests are designed and carried out under uniaxial condition in the laboratory to investigate the influence of specimen size. Cubical specimens of coal with edge dimension ranging from 5 cm (2 in.) through 20 cm (8 in.) were prepared according to the standards and tested uniaxially. Results show that compressive strength of coal is dependent on specimen size until certain level and later the change in specimen size would not yield significant change in compressive strength. Cubical specimens were chosen for testing because they are not only in close resemblance to underground pillars, but they are also the most stable shape under loading. The failure characteristics of these specimens were analyzed and their applicability to pillar design aspects in coal mines is studied. A detailed analysis of the physical and mechanical properties of the tested coal seam is also presented.

• OSTI ID: 405564
• Report Number(s): CONF-9608121-; TRN: 96:005886-0005
• Resource Relation: Conference: 15. International conference on ground control in mining, Golden, CO (United States), 13-15 Aug 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 15th international conference on ground control in mining; Ozdemir, L.; Hanna, K.; Haramy, K.Y. [eds.] [and others]; PB: 783 p.
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL MINES
STRATA CONTROL
COAL
COMPRESSION STRENGTH
SIZE
DIMENSIONS
FAILURE MODE ANALYSIS