岩石点荷载试验-研究

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1、uniaxialcompressivestrength,ignoringthetestanalysis．Theanalysisofthepointloadtestisofveryimportantpracticalsignificance．Thisarticletakerockspointloadtestforresearchobject，mainlyonthefollow：I．Simplifythepointloadtestcondition,wetakethefiniteelementmethodtoestablishthelinea

2、relasticmaterialmodel，whichunderuniformlypressure，Specimensaredestroyedbecauseoftension．Alongtheloadingdirection,compressivestressdecreasegraduallyfromloadingpoint，perpendiculartoloadingdirection，stressshowsabellshapedistribution．Themaximumtensilestressappearsatloadingpoi

3、ntbelow．TensilestressisrelevanttotheloadradiusandPoisson’Sratio．2．BasedonHertzcontacttheory,combinedwithfiniteelementmethod，thestressdistributioninloadingdirectionalediscussedaccordingtothesizeandmagnitudeofloadingstress．TakeallAnalysisofstressistributionchangesinloadingd

4、irectionunderuniformlypressureandHertzpressure。3．TakingtheThreeGorgesgraniteastheresearchobject，usingparticleflowsoftwarePFC2D，weestablishvirtualspecimenstoresearchpointloadspecimendamage．Wesuccessfullysimulatethewholeprocessofloadingdestructioninpointloadtest，anddrawthes

5、tressdistributioninfailureprocess．Atlast,wegotallimportantfeatureofbrittlematerials：theinternalstresswaszerobeforespecimendestroyed，butspecimensstillowntheabilityofbearingexternalforce．keywords：Pointloadindex；Linearelasticmaterial；HertzContactTheory；ParticleFlowTheory；PFC

6、2D1．2．3点荷载试验加载器⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯71．2．4圆柱体径向加载破坏过程⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。81．3本文的研究内容与方法⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。9第2章基于有限元法的点荷载应力分析⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯102．1点荷载试验模拟的基本约定⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．102．1．1圆柱体试样径向加载与轴向加载的选择⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯102．1．2试件尺寸选择⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯lO2．1．3材料类型的选择⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯二⋯⋯⋯⋯

7、112．1．4点荷载加载器的力的模拟处理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。122．2弹性模型下的应力分布⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．142．2．1点荷载试件的应力分布⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．152．2．2不同加载半径和泊松比条件下加载轴应力分析⋯⋯⋯⋯⋯⋯⋯172．2．3弹性材料的破坏分析⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯19第3章点荷载试验的接触应力分析⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯223．1轴对称弹性体⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯223．2光滑的非协调接触表面的几何学⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

8、⋯⋯233．3接触对点荷载试验加载轴的应力影响⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯263．4基于接触理论应力分布不同于真实情况的分析⋯⋯⋯⋯⋯⋯⋯⋯⋯27第4章颗粒流法的原理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯