土的結(jié)構(gòu)性特征對上海粘性土壓縮特性的影響.pdf

1、同濟大學(xué)土木工程學(xué)院碩士學(xué)位論文土的結(jié)構(gòu)性特征對上海粘性土壓縮特性的影響姓名：陳婷婷申請學(xué)位級別：碩士專業(yè)：地質(zhì)工程指導(dǎo)教師：徐超高彥斌20090301AbstractSoftclaysarewidelydistributedinthecoastalareaofthesouthernChinaThesenaturalclaysusuallyhavehi【ghwatercontentextensivecompressibilityandl

2、owstrengthThestructuralsoil，whichisprimarilyformedbycementationeffect，possessesacertaindegreeofstructuralstrengthThepropertiesofnaturalclaysdifferfromreconstitutedclaysduetotheinfluenceofsoilstructureThistypeofstructural

3、soilisthemainresearchobjectofthisdissertationThetraditionallaboratorytestmethodsofsoilmechanicsareusedinthisresearchBasedontheconsolidationtestsofShanghaiclayinundisturbedandreconstitutedstate，aswellasthepreviousresearch

4、andthedataofengineeringgeologicalsurveyofShanghai，theconclusionsaresummarizedasfollows：(1)Thetypicalepandelogpcurvesofundisturbedclaysarepiecewise，andstructuralclayhasobviousyieldingstressTheelogcurveofanundisturbedsoils

5、ampleissmoothintheformerpartwiⅡlasteepturninthelatterpartOntheotherhandthecurveofareconstitutedsoilsampleisapproximatelyastraightlineThecompressibilityofundisturbedclayislowwhensubjectedloadisbelowthestructureyieldingstr

6、ess，andthecompressibilityacutelyincreaseswhentheloadexceedsthestructureyieldingstress(2)Thef0rdllayerofShanghaiClayhasstrongstructuralcharacteristics，whichisrelatedtoitsrelativelyhighwatercontentThehigherthewatercontento

7、fclayis，thestrongerstructuralcharacteristictheclaywillshowThestructureyieldingstressoftheclayisbetween100to150kPa(3)TheindexesforcompressibilityofundisturbedandreconstitutedsoftclayshowdifferenttrendswithincreasingloadsT

8、hecompressionmodulusofundisturbedsoilshowsanon—linearincreasewiththeincreasingload，whiletheoneofreconstitutedsoilshowsalinearincreaseWhenasmallloadisimposed，thecompressioncoefficientofundisturbedsoilisfarlessthantherecon