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时间:2019-03-03
《基于数字图像的岩石非均匀性表征技术及初步应用》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、第26卷第3期岩石力学与工程学报Vol.26No.32007年3月ChineseJournalofRockMechanicsandEngineeringMarch,2007基于数字图像的岩石非均匀性表征技术及初步应用122于庆磊,唐春安,唐世斌(1.东北大学资源与土木工程学院,辽宁沈阳110004;2.大连理工大学土木与水利学院,辽宁大连116024)摘要:依据数字图像处理理论,研发出一种基于数字图像的岩石非均匀性表征技术。该技术描述的非均匀性更接近于岩石的真实非均匀性,并将其映射到有限元网格中,与原有的岩石破裂过程分析系统(RFPA)相结合,建立一种更能准确反映岩石细观结
2、构的数值模型,从而弥补传统数值方法所采用统计理论表征岩石非均匀特性的不足。通过对2种常规试验(单轴压缩和单轴直接拉伸)的数值模拟,再现花岗岩试件在荷载作用下的真实破裂过程。数值模拟结果表明:岩石的细观结构对岩石的力学性能和破坏过程有重要影响。该方法为进一步研究岩石、混凝土等非均质材料的力学特性和破坏机制提供一种新的手段。关键词:岩石力学;数字图像处理;非均匀性表征;破裂过程;数值模拟中图分类号:TU45;O241文献标识码:A文章编号:1000–6915(2007)03–0551–09DIGITALIMAGEBASEDCHARACTERIZATIONMETHODOFROCK
3、′SHETEROGENEITYANDITSPRIMARYAPPLICATION122YUQinglei,TANGChun′an,TANGShibin(1.SchoolofResourcesandCivilEngineering,NortheasternUniversity,Shenyang,Liaoning110004,China;2.SchoolofCivilandHydraulicEngineering,DalianUniversityofTechnology,Dalian,Liaoning116024,China)Abstract:Adigitalimagebased
4、characterizationmethodofrock′sheterogeneityisdevelopedaccordingtothetheoryofdigitalimageprocessing.Intheproposedmethod,digitalimageprocessingmethodisusedasameasurementtooltorepresenttheactualspatialdistributionofdifferentmaterialsandcomponentsintherocksamples.Theheterogeneitydescribedbythi
5、smethodisapproachingtotheactualheterogeneityofrock,whichismappedintothegridoffiniteelementmethod(FEM).Thischaracterizationmethodisincorporatedintorockfailureprocessanalysis(RFPA)code;andanumericalmodelthatcanactuallyreflectrock′sheterogeneityisestablished,whichovercomestheshortagethatstati
6、stictheoryisusedtodescribetheheterogeneityofrockintraditionalFEM.Bysimulatingtworegularlaboratorytests(uniaxialcompressionanduniaxialtensiontests),realfailureprocessesofgranitearevisuallyobserved.Thesimulationresultsshowthatheterogeneityofrockhasagreatinfluenceonitsmechanicalfunctionandfai
7、lureprocesses.Thismodelprovidesaninnovativemethodfortheinvestigationonmechanicalfeatureandfailuremechanismofheterogeneousmaterialsuchasrock,concreteandsoon.Keywords:rockmechanics;digitalimageprocessing;characterizationofheterogeneity;failureprocesses;numerical
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