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时间:2020-04-24
《分数阶黏弹塑性蠕变模型试验研究-论文.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33卷第5期岩石力学与工程学报Vbl_33N0.52叭4年5月ChineseJournalofRockMechanicsandEngineeringMay,2014分数阶黏弹塑性蠕变模型试验研究吴斐’。,谢和平一,刘建锋,边宇,裴建良(1.四川大学能源工程安全与灾害力学教育部重点实验室,四川成都610065:2.四川大学建筑与环境学院,四川成都6100653.四川大学水利水电学院,四川成都610065)摘要:现行利用等时曲线求长期强度的方法往往有以下两点不足:一是曲线上拐点不明显,确定长期强度带有一定的随意性;二是试验时间偏短、加载级数偏少,结果不
2、够准确。针对湖北江汉盐岩进行为期约5个月的蠕变试验研究,获得较好的试验结果。试验得出的等时曲线上出现明显拐点,由此确定其长期强度。试验时间长和加载级数多有力地保障了试验结果的精度,可为实际工程提供参考。在前人研究成果基础上,通过两点改进建立新的分数阶黏弹塑性蠕变模型。并从推导过程、拟合结果和理论分析3个方面证实了改进后的模型更加简单、合理。关键词:岩石力学;盐岩;长期强度;分数阶导数;Abel黏壶;蠕变模型中图分类号:Tu45文献标识码:A文章编号:1000—6915(2014)05—0964—07EXPEIUMENTALSTUDYoFFRACTIo
3、NALVISCoELASTIC.PLASTICCREEPMoDELWUFei2XIEHeping,,3LIUJianfeng,BIANYu3,PEIJianliang3,f1.KeyLaboratoryofEnergyEngineeringSafetyandDisasterMechanics,Min~tryofEducation,SichuanUniversity,Chengdu,Sichuan610065,China:2.CollegeofArchitectureandEnvironment,SichuanUniversity,Chengdu,Si
4、chuan610065,China:3.CollegeofWaterResourcesandHydropower,SichuanUniversity,Chengdu,Sichuan610065,China1Abstract:Therewereusuallytwodrawbacksincalculatingthelong—termstrengththroughisochronalcurves.OnewasthattheinflectionpointoftheisochronalcurvewasgenerallynotSOapparentleadingt
5、othedeterminationofthelong—termstrengthwithuncertainties.Theotherwasthatthetestingtimewasusuallyshortwithonlyfewloadingsteps,SOthetestresultswerenotaccurateenough.Therefore,thecreeptesttothesaltrockfromJianghaninHubeiprovinceinthisstudywascarriedoutforaboutfivemonthslong.Therew
6、asanobviousinflectionpointontheisochronalCUlWeplottedaccordingthetestdataandthelong-termstrengthwasthusdeterminedwithoutuncertainty.Thelongertestingtimeandthemoreloadingstepswereprovedtobethevitalmeasuretoguaranteethecredibilityofthetestresults.Anewfractionalviscoelastic-plasti
7、ccreepmodelwasestablishedaccordingtotheexperimentalresultstogetherwiththeimprovementsintwoaspects.Theproposedmodelwasprovedtobesimplerandmorereasonableintermsoftheprocessofderivation,theoutcomeoftestdatafittingandtheresultsoftheoreticalanalysis.Keywords:rockmechanics;saltrock;l
8、ong-termstrength:fractionalderivative;Abeldashpot:cree
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