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时间:2019-05-11
《砂卵石土动力特性的动三轴试验研究》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25卷增2岩石力学与工程学报Vol.25Supp.22006年10月ChineseJournalofRockMechanicsandEngineeringOct.,2006砂卵石土动力特性的动三轴试验研究1,2212王汝恒,贾彬,邓安福,王皆伟(1.重庆大学土木工程学院,重庆430045;2.西南科技大学土木工程与建筑学院,四川绵阳621010)摘要:砂卵石土在自然界分布广泛,并具有抗剪强度高、地震荷载作用下不易液化等优良工程特性,因此在工程建设中得到广泛应用。为反映其在复杂应力状态下的动力变形强度特性,通过砂卵石土室内动三轴试验,对不同饱和度的砂卵石土的动力特性进行研究。主要分
2、析围压、固结比和振动频率对砂卵石土动强度的影响。试验结果表明:(1)砂卵石土的动应力随固结比的增大而略有增加,随振动频率的增大而有较大增幅,而且其动强度随着围压的增大而显著增大;(2)在相同围压下,随动应力增加,破坏振次减小;(3)砂卵石土的动弹性模量随动应变的增大而减小,随围压增大而增大;(4)其阻尼比随动应变的增大而增大,明显表现在微小动应变中。关键词:土力学;砂卵石土;动三轴试验;动应力–应变关系;动弹性模量;动阻尼比中图分类号:TU44文献标识码:A文章编号:1000–6915(2006)增2–4059–06DYNAMICTRIAXIALTESTINGSTUDYONDYNA
3、MICCHARACTERISTICSOFSANDYPEBBLESOIL1,2212WANGRuheng,JIABin,DENGAnfu,WANGJiewei(1.CollegeofCivilEngineering,ChongqingUniversity,Chongqing430045,China;2.SchoolofCivilEngineeringandArchitecture,SouthwestUniversityofScienceandTechnology,Mianyang,Sichuan621010,China)Abstract:Sandypebblesoilhasgoode
4、ngineeringpropertiesandhasbeenappliedwidelyintheengineeringconstruction.Inordertostudythedynamiccharacteristicsofdeformationandstrengthundercomplexstressconditions,thedynamiccharacteristicsofsandypebblesoilswithdifferentsaturationdegreesarestudiedthoroughlybydynamictriaxialtestsinlaboratory.Th
5、einfluencesoftheconfiningpressure,consolidationratioandvibrationfrequencyonthedynamiccharacteristicsofsandypebblesoilaremainlyanalyzed.Resultsshowthat:(1)thedynamicstressofthesandypebblesoilincreaseslittlewiththeaccretionoftheconsolidationratio,butgreatwiththeincreaseofthevibrationfrequency;an
6、dthedynamicstrengthmarkedlyincreaseswiththeaccretionoftheconsolidationratio;(2)underthesameconfiningpressure,withtheincreaseofthedynamicstress,thefailurevibrationtimedecreases;(3)thedynamicelasticmodulusinduceswiththedynamicstrainincreasing,butincreasesastheaccretionofconfiningpressure;and(4)t
7、hedampingratioincreaseswiththedynamicstrainincreasing,especiallyinminordynamicstrain.Keywords:soilmechanics;sandypebblesoil;dynamictriaxialtest;dynamicstress-strainrelationship;dynamicelasticmodulus;dynamicdampingratio收稿日期:2005–11–01;修回
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