岩体结构面蠕变损伤机理研究.pdf

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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TO

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o

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