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Abstract The comparative experimental research on point load strength，uniaxial compressive strength and tensile strength of rocks in the roof and floor of coal seam was carried out by the self-made point load tester to obtain a quick and accurate method to predict uniaxial compressive strength and tensile strength through point load strength. The results show that the samples of coarse stone with lower point load strength are greatly influenced by loading rate and loading direction；so the errors of the predictive values and actual values are quite large. For the rock samples with larger point load strength，their linear correlations are higher among strengths of three types. It provides an important basis for the determination of rock strength and rock mass classification in the roof-floor of coal seam.
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Received: 08 June 2012
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2013, Vol. 32 
