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- W2068176611 abstract "We report the confined compression strengths and Young’s moduli of coal and roof rock from the Upper Freeport seam, Lucerne No. 6 Mine, Homer City, Pennsylvania, the Lower Kittanning seam, Kitt No. 1 Mine, Phillipi, West Virginia, and the Soldier Canyon seam, Soldier Canyon Mine, Price, Utah. A total of 210 tests to failure in biaxial compression were performed at confining pressures of 0.1, 3.0, and 10.0 MPa. The strengths increase by a factor of 2–3 over the confining pressure range, while the Young’s moduli are about constant. Standard deviations are 10–30% of the mean, emphasizing the need to do many tests. Failure in all three coals is brittle, progressing from dilational to multiplane shear to single-plane shear on increasing confining pressure. Strengths and moduli could not be correlated with such macroscopic inhomogeneities as large cracks, voids, and compositional changes." @default.
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- W2068176611 date "1983-01-01" @default.
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- W2068176611 title "The confined compressive strengths and Young’s moduli of three American coals" @default.
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- W2068176611 doi "https://doi.org/10.1063/1.331689" @default.
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