欢迎来到天天文库
浏览记录
ID:34492482
大小:106.10 KB
页数:8页
时间:2019-03-06
《能量耗散弹性损伤本构方程和其在围岩稳定分析中应用》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第24卷第15期岩石力学与工程学报Vol.24No.152005年8月ChineseJournalofRockMechanicsandEngineeringAug.,2005能量耗散弹性损伤本构方程及其在围岩稳定分析中的应用1222李树忱,李术才,朱维申,隋斌(1.山东大学土建与水利学院城市地下空间系,山东济南250061;2.山东大学岩土与结构研究中心,山东济南250061)摘要:在内变量不可逆热力学的理论框架下,应用能量耗散的基本原理,求解弹性损伤的等效应变和损伤演化方程,建立损伤屈服准则。应用考虑
2、能量耗散的本构方程,求解大型地下洞室围岩稳定问题,从分析结果能够给出洞室围岩损伤演化区的范围和损伤值的大小,进而判断洞室围岩何处发生损伤和断裂。认为损伤值等于1.0时,材料发生完全断裂,此时材料的破坏分析应借助宏观断裂力学的手段来进行。因此,该法为工程分析提供了细观上的理论依据,同时也为宏观分析提供了手段。关键词:岩土力学;能量耗散;不可逆热力学;弹性损伤;岩石断裂;本构方程;围岩稳定中图分类号:TU45文献标识码:A文章编号:1000–6915(2005)15–2646–08DAMAGECONSTIT
3、UTIVEEQUATIONSFORENERGYDISSIPATIONANDITSAPPLICATIONSTOSTABILITYANALYSISOFSURROUNDINGROCKMASSOFCAVERNS1222LIShu-chen,LIShu-cai,ZHUWei-shen,SUIBin(1.DepartmentofUndergroundSpace,SchoolofCivilandHydraulicEngineering,ShandongUniversity,Jinan250061,China;2.Ge
4、otechnicalandStructuralEngineeringResearchCenter,ShandongUniversity,Jinan250061,China)Abstract:Theconstitutivemodelisformulatedwithintheirreversiblethermodynamicsframework,applingthebasicprincipleofenergydissipation;theeffectivestrainoftheelastic-damage,
5、theevolutionequationsofthedamageandtheyieldingcriterionofthedamagearederived.Theconstitutiveequationsforthedamagedrockmassarewrittenaccordingtotheprincipleofstrainenergyequivalencebetweentherawrockmassanddamagedrock.Thedamagedrockmassismodeledbyusingthec
6、onstitutivelawsoftheeffectiveundamagedrockmassinwhichthenominalstressesarereplacedbytheeffectivestresses.Anadditivedecompositionofthetotalstrainintoelasticandinelasticpartsisadopted.Theelasticpartisfurtherdecomposedintotwoportions,oneisrecoverableelastic
7、distortionandtheotherisunrecoverableelasticdistortion,namelyelasticdamageddistortion.Theinelasticpartisalsodecomposedintotwoportions,oneisplasticdistortionandtheotheriscrackclosuredistortion.Theproposedmodelsareappliedtoanalyzethestabilityofcavernsofwhic
8、htheresultgivesthedamagevaluesandzonesofthesurroundingrockmassofcaverns.Thesevaluesandzonesshowwheredamageandfractureoccur.Thepapersupposesthatwhenthedamagevalueisequalto1.0,therockmassisdefinedasfullyfractured.Andthenthem
此文档下载收益归作者所有