深部煤层顶板砂岩弹性模量与孔隙度关系模型研究 |
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作者姓名: | 赵阳 周宏伟 刘迪 任伟光 刘建锋 |
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作者单位: | 1中国矿业大学(北京) 力学与建筑工程学院,北京100083;2四川大学 水利水电学院,四川成都610065 |
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摘 要: | 岩体弹性模量与岩体组分、内部结构及所处应力状态密切相关。 本文将孔隙看作岩石中 弹性模量为零的组成物质,建立了岩石整体弹性模量与各组成物质的弹性模量、体积分数关系的 模型。 结合花岗岩、深部煤岩、顶板砂岩、人工配比的高压胶结砂岩等多种脆性岩体的实验结果, 确定深部顶板砂岩的模型参数。 并针对深部顶板砂岩进行了循环加卸载声发射实验,确定了岩 石弹性阶段弹性模量随孔隙度的变化规律。 结果表明,本模型弹性模量计算值与实验测量值平 均误差为2*11%,说明本文建立的弹性模量与孔隙度关系的模型是适用的。
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收稿时间: | 2019-03-13 |
The study of the relation model between elastic modulus and porosity in deep coal seam roof sandstone |
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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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