Effect of Moisture Content on Mechanical Properties of Nemo Coal, Moberly, Missouri U.S.A.


Oriented specimens of bituminous coal were obtained from a strip mine near Moberly, Missouri, U.S.A. and were sawed and machined into cubes 1.5 in on the side oriented such that the bedding was parallel to one set of faces. The cubes were loaded to failure parallel to or perpendicular to the bedding in uniaxial compression at room temperature and pressure to determine the effect of a change in moisture content from 3.7 to 12.0% on the stress-strain curves, strength at failure and Young's modulus. The change in moisture content was obtained in protected field specimens by careful soaking. The stress-strain curves show little alteration. However, the increase in moisture content causes a decrease in mean strength from 3234 lb/in² to 2840 lb/in² for specimens loaded perpendicular to bedding and from 2290 lb/in² to 1807 lb/in² for specimens loaded parallel to bedding. Similarly, Young's modulus is reduced from 2.39 x 10⁵ lb/in² to 1.57 x 10⁵ lb/in² for loading perpendicular to bedding and from 2.22 x 10⁵ lb/in² to 1.53 x 10⁵ lb/in² for loading parallel to bedding.© 1989 Elsevier Science Publishers B.V.


Mining Engineering

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Article - Journal

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© 1989 Elsevier, All rights reserved.

Publication Date

01 Jan 1989