The effect of humidity on the compliances of coal mine shales

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Abstract

The transversely isotropic compliance characteristic of three United States coal mine shales is investigated. Tests on specimens stabilized at 0, 48 and 100 per cent relative humidity show not only a change for strength with humidity but a change in observed compliances as well. Young's moduli values obtained for ‘dry’ specimens were on the order of two or three times that of the ‘wet’ specimens. This has important implications for any computer modeling program using these types of shale.

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