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时间:2019-02-05
《了解厦门地区非饱和残积土的强度随含水量变化规律》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第34卷增1岩石力学与工程学报Vol.34Supp.12015年5月ChineseJournalofRockMechanicsandEngineeringMay,2015厦门地区非饱和残积土的强度随含水量变化规律1,221陈东霞,龚晓南,马亢(1.厦门大学建筑与土木工程学院,福建厦门361005;2.浙江大学滨海和城市岩土工程研究中心,浙江杭州310058)摘要:采用普通应变控制式直剪仪对非饱和残积砂质黏性土和黏土进行慢剪强度试验,试验结果表明,砂质黏性土的黏聚力和内摩擦角均对含水量变化敏感,黏聚力随含水量
2、的变化呈二次抛物线关系,内摩擦角随含水量增大呈幂函数减小;含水量对黏土强度的影响主要是降低了黏聚力,对内摩擦角影响很小。黏聚力随含水量的增加呈指数减小。针对上述变化规律,分别建立实用的强度经验公式,避免了吸力量测和计算困难。对提出的强度公式进行试验验证,计算预测强度并与实测强度相比较,结果表明不同竖向应力条件下,高竖向应力下强度的预测精度更高。2类残积土的强度公式预测精度均满足工程要求,可为工程实际应用提供参考。关键词:土力学;非饱和残积土;抗剪强度;含水量;黏聚力;内摩擦角中图分类号:TU411文献标识码
3、:A文章编号:1000–6915(2015)增1–3484–07VARIATIONOFTHESHEARSTRENGTHOFXIAMENUNSATURATEDRESIDUALSOILSWITHWATERCONTENT1,221CHENDongxia,GONGXiaonan,MAKang(1.SchoolofArchitectureandCivilEngineering,XiamenUniversity,Xiamen,Fujian361005,China;2.ResearchCenterofCoastaland
4、UrbanGeotechnicalEngineering,ZhejiangUniversity,Hangzhou,Zhejiang310058,China)Abstract:Shearstrengthofunsaturatedsandyandclayresidualsoilswereconductedbyconsolidated-drainedshearingmethodusingtheconventionalstraincontrolleddirectshearapparatus.Resultsshowt
5、hattheshearstrengthoftwokindsofresidualsoilsdecreaseswithincreaseofwatercontent.Theinitialwatercontenthaseffectonbothcohesionandfrictionalangleofsandyclayeysoils.Therelationshipsbetweencohesion,frictionalangleandwatercontentofsandyclayeysoilsarequadratican
6、dpowerrespectively.Whiletheinitialwatercontenthasnegligibleeffectonfrictionangleofclay.Theconsiderableinfluenceofincreasingwatercontentonshearstrengthofresidualclayisdecreasingthecohesion.Thevariationofcohesionwithwatercontentcanbedescribedbyanexponentialr
7、elationship.Onthebasisofvariationofshearstrengthindexeswithwatercontent,twonewstrengthformulasofunsaturatedsandyclayeyandclaywereestablishedwithoutsuctioncomponentandweredemonstratedbyfurthertests.Comparisonsofthecalculatedandmeasuredshearstrengthshowthatt
8、heaccuracyofthepredictionishigherunderhighverticalstress.TwostrengthformulascanprovidethegoodestimationofshearstrengthofunsaturatedresidualsoilsinXiamenforengineeringapplication.Keywords:soilmechanics;unsatur
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