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时间:2020-03-25
《岩体结构面蠕变损伤机理研究.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、工程地质学报1004—9665/2009/17(3)-0357-06岩体结构面蠕变损伤机理研究唐红梅①②陈涛②鲜学福①(①重庆大学西南资源开发及环境灾害控制工程教育部重点实验室重庆400044)(②重庆交通大学岩土工程研究所重庆400074)摘要通过对伯格斯模型和西原模型的分析比较,选取西原模型研究岩体结构面的蠕变损伤特性。在TO2、阶段损伤量较小,而当≥时,一段时间后,其损伤量开始突变;剪应力越大,其初始剪切模量越大,随时间降低越快,达到稳定蠕变阶段时降低量也相应越大;剪应力越大,结构面损伤量随时问增长越快,在达到稳定蠕变阶段时,损伤量也越大。关键词岩体力学蠕变损伤机理剪切模量.结构面西原模型泥岩中图分类号:P642.22文献标识码:AⅣmCHANISMoFCREEPDAMAGEoNSTRUCTUREPLANEINRoCKⅣSSTANGHongmei①②CHENTao~XIANXuefu~(~KeyLaboratoryFork唧zonofSouthwesternResources&池Environmen3、talDisasterControlEngineering,MinistryofEduca—tion,ChongqingUniversityIChongqing400044)(~InstituteofGeotechnicalEngineering,ChongqingJiaotongUniversity。Chongqing400074)AbstractAtfirst。thispapercomparestheBurgerscreepmodelwiththeBingh啪一Kelvincreepmode1.Basedonthecomparison。theBingh锄一Kelvincr4、eepmodelisemployedtostudythecreepdamagecharacteristicsofstructuralplaneinrockmass.Undertheconditionthattheshearstressappliedontheplaneislessthanitsshearstrength(.e.,下0<丁),thispaperderivatestheexpressionofshearmoduluswiththeBingh锄一Kelvinmodel,anddefinesadamagevariabletakingtheshearmodulusasv5、ariable.Basedonthesheartestsonmudstone-thispa-perfurthercalculatestheshearmodulusanddamagevalueofthestructuralplaneunderthesamenormalcompres—sivestress.,IIheresultsshowthat:(1)en丁o6、neislittleatthefirsttwophases,and(2)whenTO≥T,thedamagevaluealterssuddenlysometimelater.111einitialshearmodulusincreaseswiththein—creasingintheshearstress,andunderhighershearstress,theyreducemorequicklywithtimeanddecreasemorewhilecreepreachestothestablephase.卟ecreepdeformationofstructuralpla7、neincreaseswiththeincreasinginshearstressandtime-andthedamageincreasesmoreunderhighershearstresswhencreepattainstothestablephase.KeywordsRockmechanics,Creepdamage,Shearmodulus,Structuralplane,Bingha/n~Kelvincreepmodel,Mudst0ne·收稿日期:2008-06—25;收到修改稿日期:200
2、阶段损伤量较小,而当≥时,一段时间后,其损伤量开始突变;剪应力越大,其初始剪切模量越大,随时间降低越快,达到稳定蠕变阶段时降低量也相应越大;剪应力越大,结构面损伤量随时问增长越快,在达到稳定蠕变阶段时,损伤量也越大。关键词岩体力学蠕变损伤机理剪切模量.结构面西原模型泥岩中图分类号:P642.22文献标识码:AⅣmCHANISMoFCREEPDAMAGEoNSTRUCTUREPLANEINRoCKⅣSSTANGHongmei①②CHENTao~XIANXuefu~(~KeyLaboratoryFork唧zonofSouthwesternResources&池Environmen
3、talDisasterControlEngineering,MinistryofEduca—tion,ChongqingUniversityIChongqing400044)(~InstituteofGeotechnicalEngineering,ChongqingJiaotongUniversity。Chongqing400074)AbstractAtfirst。thispapercomparestheBurgerscreepmodelwiththeBingh啪一Kelvincreepmode1.Basedonthecomparison。theBingh锄一Kelvincr
4、eepmodelisemployedtostudythecreepdamagecharacteristicsofstructuralplaneinrockmass.Undertheconditionthattheshearstressappliedontheplaneislessthanitsshearstrength(.e.,下0<丁),thispaperderivatestheexpressionofshearmoduluswiththeBingh锄一Kelvinmodel,anddefinesadamagevariabletakingtheshearmodulusasv
5、ariable.Basedonthesheartestsonmudstone-thispa-perfurthercalculatestheshearmodulusanddamagevalueofthestructuralplaneunderthesamenormalcompres—sivestress.,IIheresultsshowthat:(1)en丁o6、neislittleatthefirsttwophases,and(2)whenTO≥T,thedamagevaluealterssuddenlysometimelater.111einitialshearmodulusincreaseswiththein—creasingintheshearstress,andunderhighershearstress,theyreducemorequicklywithtimeanddecreasemorewhilecreepreachestothestablephase.卟ecreepdeformationofstructuralpla7、neincreaseswiththeincreasinginshearstressandtime-andthedamageincreasesmoreunderhighershearstresswhencreepattainstothestablephase.KeywordsRockmechanics,Creepdamage,Shearmodulus,Structuralplane,Bingha/n~Kelvincreepmodel,Mudst0ne·收稿日期:2008-06—25;收到修改稿日期:200
6、neislittleatthefirsttwophases,and(2)whenTO≥T,thedamagevaluealterssuddenlysometimelater.111einitialshearmodulusincreaseswiththein—creasingintheshearstress,andunderhighershearstress,theyreducemorequicklywithtimeanddecreasemorewhilecreepreachestothestablephase.卟ecreepdeformationofstructuralpla
7、neincreaseswiththeincreasinginshearstressandtime-andthedamageincreasesmoreunderhighershearstresswhencreepattainstothestablephase.KeywordsRockmechanics,Creepdamage,Shearmodulus,Structuralplane,Bingha/n~Kelvincreepmodel,Mudst0ne·收稿日期:2008-06—25;收到修改稿日期:200
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