Anisotropic elasticity of coals. Final report, September 30, 1983-January 31, 1985

Technical Report · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5835560

Szwilski, A B; Gillis, P P

The initial research work, loading tests on coal samples, emphasized the limited scope of using extracted coal samples, from the coal seam, to establish their anisotropic nature. The extraction processes of drill cores and cutting directly from the coal face, of the coal seam, altered the coal samples, both physically (induced fractures) and chemically (weathering). Thus the extracted coal samples are not good representatives of the coal seam. The triaxial load testing procedure gave more consistent values of anisotropic elasticity. Therefore it was decided to evaluate the elastic properties and structural nature of coal seams in situ by means of: penetration tests, and rebound hardness tests. The principal objective of using this methodology was to collect a large amount of statistical data, simply and economically, that would be representative of the coal seam. The expected advantages of developing a penetrometer and carrying out penetrometer tests were threefold: The loading state of the immediate zone, around the penetrometer tip, seems to be hydrostatic. Results from the coal seam (in situ) are more representative of the undisturbed coal seam. Representative values of elastic modulus (and strength) over a wide area of the coal face and around the coal pillar gives a large base of statistical data. A report on this research work is given in Appendix I, Penetrometer for Determination of Mechanical Properties of Coal. A Schmidt rebound hammer (RM-710) and an Equotip rebound hardness tester were used to bulk data from coal samples in the laboratory, and from coal faces in two coal mines in Hyden, Kentucky. The results are given in Appendix V. Also, the results of analyses from samples from the same coal (Alma coal seam) is given in Appendix VI.

• Research Organization: Kentucky Univ., Lexington (USA). Coll. of Engineering
• DOE Contract Number: AS05-81ER10840
• OSTI ID: 5835560
• Report Number(s): DOE/ER/10840-4; ON: DE85008671
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ANISOTROPY
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
COAL
COAL DEPOSITS
CORRELATIONS
DATA
ELASTICITY
ENERGY SOURCES
EXPERIMENTAL DATA
FEDERAL REGION IV
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
HARDNESS
INFORMATION
KENTUCKY
MATERIALS
MEASURING INSTRUMENTS
MEASURING METHODS
MECHANICAL PROPERTIES
MINERAL RESOURCES
NORTH AMERICA
NUMERICAL DATA
PENETROMETERS
RESEARCH PROGRAMS
RESOURCES
TENSILE PROPERTIES
USA