基于X射线CT基础上的砂岩破裂模式研究
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摘要
借助CT机对砂岩破裂过程的实时观测以及结合CT图像和CT数的分析发现:在单轴和三轴压力作用下,砂岩CT数方差变化剧烈的地方发生脆性变化,而方差比较稳定的地方发生塑性变化;当有渗透水流作用时,砂岩应变特性与干砂岩的应变特性有明显差异,峰值强度显著增大,残余强度也明显增加;砂岩在单轴干燥状态下发生脆性破坏,而在有渗透压力和围压的情况下发生塑性破坏。通过CT技术可以方便地计算出砂岩的实时孔隙率。
It has been found via using multislice spiral CT(MSCT) in combining with CT images and analysis to conduct the real time observation of rock fracture process that under the action of uniaxial and triaxial compressive pressure,the brittle variation happens in the place where sandstone CT number variance changes greatly while the plastic variation happens in the place where the varance is stable.When there is reaction by seepage water flow,the properties of sandstone strain are obviously from those of dry sandstones,so that the peak value increase remarkably,and the residual strength also increases obviously.The dry sandstone's crack is brittle under uniaxial compressive condition.When the compressive conditions are seepage pressure and triaxial compressive,the cracking is plasticity.The porosity can be calculated randomly in the impressive process either via CT technology.
It has been found via using multislice spiral CT(MSCT) in combining with CT images and analysis to conduct the real time observation of rock fracture process that under the action of uniaxial and triaxial compressive pressure,the brittle variation happens in the place where sandstone CT number variance changes greatly while the plastic variation happens in the place where the varance is stable.When there is reaction by seepage water flow,the properties of sandstone strain are obviously from those of dry sandstones,so that the peak value increase remarkably,and the residual strength also increases obviously.The dry sandstone's crack is brittle under uniaxial compressive condition.When the compressive conditions are seepage pressure and triaxial compressive,the cracking is plasticity.The porosity can be calculated randomly in the impressive process either via CT technology.
引文
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[4]仵彦卿,丁卫华,蒲毅彬,等.压缩条件下岩石密度损伤增量的CT动态观测[J].自然科学进展,2000,10(9):830～835.
[5]张流,黄建国,高平.水对岩石变形过程中电阻率变化的影响[J].地震,2003,23(1):8～14.
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[10]OhtaniT,NakashimaY,MuraokaH.ThreedimensionalmiaroliticcavitydistributionintheKakkondagranitefromboreholeWD-1ausingX-raycomputerisedtomography[J].EngineeringGeology,2000,56:1～9.
[11]WildenschildD,HopmansJW,WazCMP,etal.UsingX-raycomputedtomographyinhydrology:systemsreso-lutionsandlimitations[J].JournalofHydrology,2002,267:285～297.
[12]GoodwinAK,O'NellMA,AndersonWF.TheuseofX-raycomputertopographytoinvestigateparticulateinter-actionswithinopencastcoalminebackfills[J].EngineeringGeology,2003,70:331～341.
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