复杂应力路径下糯扎渡堆石料应力C应变特征研究

《复杂应力路径下糯扎渡堆石料应力C应变特征研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、第27卷增1岩石力学与工程学报Vol.27Supp.12008年6月ChineseJournalofRockMechanicsandEngineeringJune，2008复杂应力路径下糯扎渡堆石料应力–应变特征研究古兴伟，沈蓉，张永全(昆明勘测设计研究院，云南昆明650033)摘要：通过对云南澜沧江糯扎渡水电站坝体I区筑坝堆石料在拟定应力路径下的三轴固结排水剪切试验数据分析，获取了堆石料的应力–应变参数。通过研究复杂应力路径下堆石料的应力–应变特征，得出了堆石料应力–应变特征将严格受控于应力路径，且试

2、验实测应力路径与拟定应力路径相一致、不同应力状态下筑坝堆石料变形模量存在较大差异的结论。通过计算获得了复杂应力路径下堆石料的强度参数和等应力比加载条件下堆石料的变形模量。针对应力状态这一影响堆石料强度的主要因素，深入研究了其与堆石料强度之间的关系，得出了应力状态、黏聚力和内摩擦角三者之间的关系，对糯扎渡水电站大坝本构模型的建立和稳定性计算有一定意义。关键词：土力学；糯扎渡；堆石料；应力路径；应力–应变特征；强度参数中图分类号：TU43文献标识码：A文章编号：1000–6915(2008)增1–3251–

3、10STUDYONSTRESS-STRAINPROPERTIESOFROCKFILLMATERIALSUNDERDIFFERENTSTRESSPATHSINNUOZHADUPROJECTGUXingwei，SHENRong，ZHANGYongquan(KunmingHydropowerInvestigation，DesignandResearchInstitute，Kunming，Yunnan650033，China)Abstract：Basedonthetestingdataofthetriaxial

4、consolidationtestsontheupstreammainrockfillmaterialsusedtobuildthedaminNuozhaduhydropowerstationunderdifferentstresspaths，theshearstrengthandstress-strainpropertiesarestudiedandthestress-strainparametersoftherockfillmaterialsareobtained.TheNuozhaduhydrop

5、owerstationislocatedinLancangRiver，YunnanProvince.Severalconclusionsaredrawnafterananalysisofthepropertiesofthestress-strainunderthespecialstresspathsthatthestress-strainpropertiesarecontrolledbythestresspathsandtherockfillmaterialsandtheactualstresspath

6、sareconsistentwiththeassumedstresspathsinthetriaxialconsolidationtest.Itisfoundthatthereisagreatdifferencefortherockfillmaterials′deformationmoduliunderthedifferentstressstates.Accordingtothedataofthetriaxialconsolidationtests，thestrengthparametersandthe

7、deformationmodulioftherockfillmaterialsunderdifferentstresspathswithaconstantstressratioarefiguredout.Thestressstateisoneofthemaininfluentialfactorsfortherockfillmaterialsstrengthandithascloserelationshipwithstrength.Therelationshipsamongthestressstate，t

8、hecohesionandthefrication-angle，strengthparametersarediscussed.Alltheseresearchesaresignificantforestablishingthemechanicalconstitutiverelationsofthedamandanalyzingthedam′sstabilityinNuozhaduhydropowerstation.Keywords：soil