The study of the relation model between elastic modulus and porosity in deep coal seam roof sandstone
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Graphical Abstract
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Abstract
Rockmass*selasticmodulusiscloselyrelatedtoitscompositions,innerstructuralcharacteris⁃ ticsandstress⁃strainstate*ByassumingtheelasticmodulusofporetRockmass*selasticmodulusiscloselyrelatedtoitscompositions,innerstructuralcharacteris⁃ ticsandstress⁃strainstate*Byassumingtheelasticmodulusofporethatasapartofrockiszero,arela⁃ tionalmodelbetweentheelasticmodulusofthewholerockandcomponentaswellasvolumefractions wasderivedinthispaper*Theparametersinthismodelofdeeproofsandstoneweredeterminedbythe experimentalmeasurementsofdifferentbrittlerockssuchasgranite,deepcoalrock,roofsandstoneand highcementationsandstonepreparedbyartificialproportioning*Inaddition,theacousticemissionexper⁃ imentofcyclicloadingandunloadingondeeproofsandstonewasconductedtodeterminethechange rulebetweenelasticmodulusintherockelasticphaseandporosity*Theexperimentalresultsshowthat theaverageerrorbetweenthetheoreticalcalculatedvalueandexperimentalmeasurementvalueofthee⁃ lasticitymoduluswas2*11%,whichprovedthatrelationmodelbetweenelasticmodulusandporosity understresswasapplicable* hatasapartofrockiszero,arela⁃ tionalmodelbetweentheelasticmodulusofthewholerockandcomponentaswellasvolumefractions wasderivedinthispaper*Theparametersinthismodelofdeeproofsandstoneweredeterminedbythe experimentalmeasurementsofdifferentbrittlerockssuchasgranite,deepcoalrock,roofsandstoneand highcementationsandstonepreparedbyartificialproportioning*Inaddition,theacousticemissionexper⁃ imentofcyclicloadingandunloadingondeeproofsandstonewasconductedtodeterminethechange rulebetweenelasticmodulusintherockelasticphaseandporosity*Theexperimentalresultsshowthat theaverageerrorbetweenthetheoreticalcalculatedvalueandexperimentalmeasurementvalueofthee⁃ lasticitymoduluswas2*11%,whichprovedthatrelationmodelbetweenelasticmodulusandporosity understresswasapplicable*
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