砂性土与水泥浆体剪切特性试验研究

《砂性土与水泥浆体剪切特性试验研究》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、学号：常州大学毕业设计（论文）（2013届）题目砂性土与水泥浆体剪切特性试验研究学生王莹学院怀德学院专业班级土木091校内指导教师夏雄专业技术职务副教授校外指导老师蔡云专业技术职务总工程师二○一三年六月砂性土与水泥浆体剪切特性试验研究摘要：桩基础是一种重要的基础形式，在铁路、公路、桥梁、港口码头、高层建筑等工程中应用十分广泛。桩-土接触面力学特性的研究是解决桩-土相互作用问题的前提,尤其对于摩擦型桩而言,桩-土接触面问题直接影响到桩基的承载力。本文针对常州土层特点，考虑桩体压入砂土的力学特性，开展了三种不同水灰比和密实度的砂土与混凝土桩接触面室内单剪试验，每组试验考虑5个法

2、向应力。试验结果表明，砂土与桩接触面的力学行为随砂土的密实度和水灰比呈现明显相关性。在砂土密实度一定时，接触面的抗剪强度，摩擦角、随混凝土试样水灰比的增大非线性单调减小，粘聚力单调减大。在水灰比一定时，接触面的抗剪强度，摩擦角、随砂土密实度的增大非线性单调增大，粘聚力单调减小。法向应力较小时密实度对接触面应力应变曲线的初始段影响不大。试验结果可供相关工程数值分析参考。关键词：接触面；剪切特性；试验研究；砂土；水泥浆Studyofshearpropertiesofsand-cementslurryinterfacebyshearexperimentalstudyAbstrac

3、t：Thepileisallimportantfoundationform，anditisextensivelyusedinrailways，roads，bridges，portsandhigh一risebuildings．Theinterfacemechanicalpropertiesbetweenpileandsoilaretheprerequisiteforthepile-soilinteractionproblem.AccordingtothepropertiesofChangzhouregion,consideringthemechanicalproperties

4、ofbodyispressedintothesand,experimentsbyusinglaboratorysheartestsareperformedonsandconcreteinterfaceswiththreekindsofsanddensity，wherefivenormalstressesaretakenintoaccountineachsanddensityinthispaper.Theexperimentaldatashowthatdensityofsandandwatercementratioplayanimportantroleinmechanismb

5、ehaviorofpile—soilinterface．Whiledensityofsandisfixed，,withhigherwatercementratio,shearingstrength,frictionangleoftheinterfacealldecreasemonotonouslyandnonlinearly,butcohesionforceoftheinterfaceincrease．Whilewatercementratioisfixed，withhigherdensityofsand,shearingstrength,frictionangleofth

6、einterfacealldecreasemonotonouslyandnonlinearly,butcohesionforceoftheinterfaceincrease．Theinitialpieceofstress—straincurveofinterfabeisnotsensitivetodensityofsand.ThisexperimentaIresultsputthegoodfoundationforrelativeengineeringnumericalsimulation．Keywords：interface,shearproperties,experim

7、entalstudy,sand,cementslurry,VI摘要····································································Ⅰ目次····································································II1绪论···································································11.1接触面特性·······