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大小:1.48 MB
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时间:2020-05-14
《拉伸试验中充填体声发射特性及数值模拟研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第6卷第3期有色金属科学与工程Vo1.6,No.32015卑6月NonferrousMetalsScienceandEngineeringJun.2O15文章编号:1674—9669(2015)03-0094-06DOh10.132646.cnki.ysjskx.2015.03.018拉伸试验中充填体声发射特性及数值模拟研究谢勇a.C,何文b一,刘贤俊一,谢涛a,c'黄翔涛a(江西理工大学,a.建筑与测绘工程学院Ib.资源与环境工程学院;c.江西省矿业工程重点实验室,江西赣州341000)摘要:下向胶结充填采矿过程中,胶结充填体顶板的破坏不仅受抗压强度的影响,而且还表现为张拉破坏.为了
2、充分探索充填体顶板张拉破坏过程中的损伤演化规律,对胶结充填体试件进行了单轴抗拉破坏声发射试验.并利用RFPAzo软件对其拉伸破坏过程及声发射信号进行了数值模拟.模拟分析表明,胶结充填体的抗拉破坏是始于试件圆盘中部,沿着加栽轴线方向出现裂隙萌生与扩展,并汇聚成宏观的裂隙带,最终导致整体失稳的破坏过程.模拟结果还再现了抗拉破坏时声发射的分布规律.其结果对比室内试验的声发射特征规律,具有很好的一致性.关键词:张拉破坏;声发射;数值模拟;损伤演化规律中图分类号:TD326文献标志码:AAcousticemissioncharacteristicsforfillingbodyduringtens
3、iletestsanditsnumericalsimulationXIEYong~,HEWen,LIUXianjnil,XIETao,HUANGXiangtao(a.SchoolofArchitecturalandSurveyingandMappingEngineeringIb.SchoolofResourcesandEnvironmentalEngineering,C.JiangxiKeyLaboratoryofMiningEngineering,JiangxiUniversityofScienceandTechnology,Ganzhou341000,China)Abstract:
4、Theroofcementedbackfilldamageisaffectedbycompressivestrengthandtensilefailureintheunderhandstopingwithcementedfillingprocess.Uniaxialtensilememberdamagetestsareperformedtomonitorthewholeprocessofcementingbackfilltestbyusingacousticemissiontechniquetoexplorecementedbackfillrooftensilefailuredurin
5、gtheevolutionofdamagelaw.RFPA。softwareisappliedtosimulatecementedfillingontensilefailureandacousticemissionsignals.Thesimulationresultsshowconsolidatedcementedbackfillinthetensilespecimeniscentraldiscwiththeloadingaxisdirectionappearingcrackedinitiation.Extensionandgatheredintomacrofracturezonea
6、ndeventuallyleadtotheoveralllossoffailureprocess.Thesimulationresultsrepresentthedistributionofacousticemissionduringtensilefailurewithfavorableconsistencycomparedwithindoortestresultsofacousticemissioncharacteristics.Thatcansimulatethedamageevolutionmoreaccurateruleswhenthetensilestrengthofceme
7、ntedbackfilldamagebyusingthenumericalsimulationanalysissoftware——RFPA2n.Itprovidesatheoreticalbasisforusingacousticemissiontechnologyasthemonitoringofconsolidatedfillingbodydamage.Keywords:tensilefailure;acousticemission;num
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