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1、學號:09447308常州大學畢業(yè)設計(論文)(2013屆)題目砂性土與水泥漿體剪切特性試驗研究學生王瑩學院懷德學院專業(yè)班級土木091校內指導教師夏雄專業(yè)技術職務副教授校外指導老師蔡云專業(yè)技術職務總工程師二○一三年六月砂性土與水泥漿體剪切特性試驗研究摘要:樁基礎是一種重要的基礎形式,在鐵路、公路、橋梁、港口碼頭、高層建筑等工程中應用十分廣泛。樁-土接觸面力學特性的研究是解決樁-土相互作用問題的前提,尤其對于摩擦型樁而言,樁-土接觸面問題直接影響到樁基的承載力。本文針對常州土層特點,考慮樁體壓入砂土的力學
2、特性,開展了三種不同水灰比和密實度的砂土與混凝土樁接觸面室內單剪試驗,每組試驗考慮5個法向應力。試驗結果表明,砂土與樁接觸面的力學行為隨砂土的密實度和水灰比呈現明顯相關性。在砂土密實度一定時,接觸面的抗剪強度,摩擦角、隨混凝土試樣水灰比的增大非線性單調減小,粘聚力單調減大。在水灰比一定時,接觸面的抗剪強度,摩擦角、隨砂土密實度的增大非線性單調增大,粘聚力單調減小。法向應力較小時密實度對接觸面應力應變曲線的初始段影響不大。試驗結果可供相關工程數值分析參考。關鍵詞:接觸面;剪切特性;試驗研究;砂土;水泥漿S
3、tudyofshearpropertiesofsand-cementslurryinterfacebyshearexperimentalstudyAbstract:Thepileisallimportantfoundationform,anditisextensivelyusedinrailways,roads,bridges,portsandhigh一risebuildings.Theinterfacemechanicalpropertiesbetweenpileandsoilaretheprereq
4、uisiteforthepile-soilinteractionproblem.AccordingtothepropertiesofChangzhouregion,consideringthemechanicalpropertiesofbodyispressedintothesand,experimentsbyusinglaboratorysheartestsareperformedonsandconcreteinterfaceswiththreekindsofsanddensity,wherefive
5、normalstressesaretakenintoaccountineachsanddensityinthispaper.Theexperimentaldatashowthatdensityofsandandwatercementratioplayanimportantroleinmechanismbehaviorofpile—soilinterface.Whiledensityofsandisfixed,,withhigherwatercementratio,shearingstrength,fri
6、ctionangleoftheinterfacealldecreasemonotonouslyandnonlinearly,butcohesionforceoftheinterfaceincrease.Whilewatercementratioisfixed,withhigherdensityofsand,shearingstrength,frictionangleoftheinterfacealldecreasemonotonouslyandnonlinearly,butcohesionforceof
7、theinterfaceincrease.Theinitialpieceofstress—straincurveofinterfabeisnotsensitivetodensityofsand.ThisexperimentaIresultsputthegoodfoundationforrelativeengineeringnumericalsimulation.Keywords:interface,shearproperties,experimentalstudy,sand,cementslurry,V
8、摘要····································································Ⅰ目次····································································II1緒論···································································11.1接觸面特性